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ofdm orthogonal frequency-division multiplexing transmission research papers




Spectrally efficient compatible single-sideband modulation for OFDM transmission with direct detection
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ABSTRACT A combination of orthogonal frequency-division multiplexing (OFDM) and compatible single-sideband modulation (CompSSB) using a standard direct-detection scheme is suggested to overcome chromatic dispersion without explicit compensation.

OFDM transmission corrupted by impulsive noise
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ABSTRACT OFDM is a promising technique being used for bandwidth efficient communication over the power-line channel. It provides excellent possibilities to adapt to the frequency- selectivity of the channel. The influence of impulsive noise on the OFDM transmission is

The influence of the dispersion map in coherent optical OFDM transmission systems
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ABSTRACT The influence of the dispersion map is studied on the nonlinear tolerance of OFDM transmission systems. We show that the nonlinear tolerance is severely degraded when inline dispersion compensation is employed in the transmission line.

1Tb/s (111Gb/s/ch 10ch) no-guard-interval CO-OFDM transmission over 2100 km DSF
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ABSTRACT We demonstrated spectrally efficient (2-b/s/Hz) 1Tb/s DWDM transmission of 111 Gb/s noguard-interval PDM CO-OFDM signals over DSFs with 50 GHz spacing. The record transmission distance of 2100 km in the 100-Gb/s-data-rate CO-OFDM systems was

WHT/OFDM-an improved OFDM transmission method for selective fading channels
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Abstract In the contribution the application of the Walsh-Hadamard transformation is proposed as the means to combat the influence of selective fading on the OFDM system performance. Substantial improvement as compared with the OFDM system applying the

1 Gbit/s MIMO-OFDM transmission experiments
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ABSTRACT In a joint effort, we have realized an experimental mobile communication link with a gross data rate of 1 Gbit/s, using real-time MIMO-OFDM signal processing. We report on the set-up of the experimental system and on over-the-air transmission experiments using

132.2-Gb/s PDM-8QAM-OFDM transmission at 4-b/s/Hz spectral efficiency
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ABSTRACT In this letter, we investigate 132.2-Gb/s polarization-division-multiplexed orthogonal frequency-division-multiplexing (PDM-OFDM) transmission at 25-GHz channel spacing. We show that the nonlinear tolerance is dependent on the OFDM symbol length.

400-Gbit/s optical OFDM transmission over 80 km in 50-GHz frequency grid
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Abstract 400-Gbit/s coherent PDM-OFDM transmission over 80 km has been successfully demonstrated in 50-GHz frequency grid. The use of multiband OFDM with 32-QAM subcarrier modulation enables to increase a spectral efficiency to 8.0 bit/s/Hz at 400 Gbit/s.

Rate-optimized power allocation for DF-relayed OFDM transmission under sum and individual power constraints
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We consider an OFDM (orthogonal frequency division multiplexing) point-to-point transmission scheme which is enhanced by means of a relay. Symbols sent by the source during a first time slot may be (but are not necessarily) retransmitted by the relay during a

Ber Calculation Using Matlab Simulation For Ofdm Transmission
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(OFDM) modulation is being used more and more in telecommunication, wired and wireless. DVB and DAB already use this modulation technique and ADSL is based on it. The advantages of this modulation are the reason for its increasing usage. OFDM can be

Low-PMEPR OFDM transmission with an iterative receiver technique for cancellation of nonlinear distortion
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ABSTRACT When a low-PMEPR (Peak-to-Mean Envelope Power Ratio) is intended for OFDM (Orthogonal Frequency Division Multiplexing) transmission, a wellknown solution is to resort to signal processing schemes that involve nonlinear operations (eg, an appropriate

An extension of guard-interval based symbol and frequency synchronization technique for wireless OFDM transmission
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ABSTRACT A guard-interval based symbol and frequency synchronization technique with an extended observation interval of the OFDM transmission with higher level modulations is investigated for the wireless radio environments. The performance of the proposed guard-

A radio-over-fiber link for OFDM transmission without RF amplification
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ABSTRACT We study the feasibility of a radio-over-fiber (ROF) link with external modulation and an unamplified photodetector; we show high-quality (EVM-38dB, RF power-1dBm) 64- QAMOFDM transmission when optimizing the photodiode impedance matching and the

LDPC-coded OFDM transmission over graded-index plastic optical fiber links
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ABSTRACT The possibility of 10-Gb/s transmission over graded-index plastic optical fiber (GI- POF) using the orthogonal frequency-division multiplexing (OFDM) and iteratively decodable codes is demonstrated by simulations. Several classes of low-density parity-

An efficient and frequency-offset-tolerant channel estimation and synchronization method for PDM CO-OFDM transmission
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ABSTRACT We propose a computationally efficient and frequency-offset-tolerant channel estimation and synchronization method for polarization-division-multiplexed (PDM) coherent optical OFDM (COOFDM). Using this method, we demonstrate a 43-Gb/s PDM CO-OFDM

On optimum pilot design for comb-type OFDM transmission over doubly-selective channels
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ABSTRACT We consider comb-type OFDM transmission over doubly-selective channels. Given a fixed number and total power of the pilot subcarriers, we show that the MMSE- optimum pilot design consists of identical equally-spaced clusters where each cluster is

Performance analysis of DFT-spread based OFDM transmission system over underwater acoustic channels
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ABSTRACT This paper presents peak-to-average power ratio (PAPR) and bit error ratio (BER) performances of Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-Spread OFDM) system over underwater acoustic channels. Comparing

21.4 Gb/s coherent optical OFDM transmission over 200 km multimode fiber
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21.4 Gb/s Coherent Optical OFDM Transmission over 200 km Multimode Fiber Zhengrong

A study on reduction of the affection of impulse noise in OFDM transmission
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Abstract In OFDM transmission, impulse noise in the time domain causes severe degradation of bit error rate characteristics of the received OFDM signal because their influence spreads to the all carriers by the process of demodulation using DFT.

Pre-emphasis and RF-pilot tone phase noise compensation for coherent OFDM transmission systems
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ABSTRACT In this paper, pre-emphasis and RF-pilot tone phase noise compensation are discussed for coherent OFDM transmission systems. It is shown that only 1.6% of the total power is required for the RF-pilot for optimal phase noise compensation.

Guard time optimization for OFDM transmission over fading channels
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ABSTRACT In this paper, we consider the transmission of an orthogonal frequency division multiplexed (OFDM) signal over a channel with timevarying frequency-selective fading and additive white Gaussian noise (AWGN). Due to channel dispersion, intersymbol and

Real-time 3 Gb/s 16QAM-encoded optical OFDM transmission over 75 km metroCor SMFs with negative power penalties
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ABSTRACT Real-time optical OFDM (OOFDM) transceivers with advanced channel estimation are experimentally demonstrated, which support 3Gb/s over 75km SMF transmission with negative power penalties of-2dB in directly-modulated-laser-based IMDD systems without

A theoretical framework for peak-to-average power control problem in OFDM transmission
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ABSTRACT This thesis is devoted to the power control problem in orthogonal frequency division multiplexing (OFDM) multicarrier transmission. Multicarrier transmission has proved to be an efficient transmission technique in frequency-selective channels and has already been

Frequency-offset synchronization and channel estimation for OFDM-based transmission
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ABSTRACT This letter is concerned with a frequency-offset esti-mation technique for OFDM- based transmission systems. The frequency estimation technique utilizes a repetitive signal structure inside of a OFDM symbol which is used to enlarge the range and increase the

A MIMO-OFDM transmission scheme employing subcarrier phase hopping
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ABSTRACT This paper proposes a subcarrier phase hopping scheme for space division multiplexing (SPH-SDM) and applies it to MIMO-OFDM mobile communications. The SPH- SDM scheme is an extended version of the conventional SPH scheme for transmit

Joint evaluation of nonlinear distortion effects and signal metrics in OFDM basedtransmission systems
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ABSTRACT In this contribution, we provide a theoretical characterisation of nonlinear distortion effects in orthogonal frequency division multiplex (OFDM) either in the downlink as well as in the uplink scenario. Previous papers presented on this topic considered OFDM

Carrier-to-signal power ratio in fiber-optic SSB-OFDM transmission systems
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A promising technology that has recently been proposed for fiber-optic transmission systems is orthogonal frequency domain multiplexing (OFDM)[1, 2]. An OFDM signal consists of many low data rate subchannels that are orthogonally multiplexed using the fast Fourier

On cyclic delay diversity in OFDM based transmission schemes
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ABSTRACT Cyclic Delay Diversity (CDD) is a simple ap-proach to introduce spatial diversity to an Orthogonal Frequency Division Multiplexing (OFDM) based transmission scheme that itself has no built-in diversity. It also can be regarded as a Space-Time Code (STC). But in

Spectral Efficiency Limitation by Fiber Non-linearity in Optical OFDM Transmission Systems
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ABSTRACT In this paper performance limits of optical OFDM transmission systems are investigated. The maximum achievable spectral efficiency is limited by additive noise of optical amplifiers and non-linear fiber effects. In order to assess this measure, a weakly

Iterative detection of differentially modulated APSK signals in an OFDM transmission system
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P Haase, H Rohling Proceedings of the The 5th International 2002 phaase.net DPSK and its extension to higher level DAPSK modulation schemes is presented. We consider the well-known OFDM transmission technique that requires, in combination with noncoherent detection, no channel state information. By simulation it is shown that the

115.2 Gb/s optical OFDM transmission with 4 bit/s/Hz spectral efficiency using IEEE 802.11 a OFDM PHY
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ABSTRACT We investigate the possibility of spectrally efficient 100 Gb/s transmission using IEEE 802.11 a OFDM PHY based coherent optical OFDM and confirm that such systems may operate at 115.2 Gb/s with 26.5 GHz signal bandwidth.

Spectrally efficient OFDM-transmission over single-mode fiber using direct detection
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ABSTRACT For the direct-detection optical orthogonal frequency division multiplexing (DD- OOFDM) system, the influence of the Mach-Zehnder modulator (MZM) operating point on the receiver sensitivity is studied here. Analysis and simulation show that by proper biasing of

Adaptive OFDM transmission for broadband fixed wireless access systems
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ABSTRACT We present adaptive power allocation schemes for bitinterleaved coded broadband OFDM transmission over time-invariant channels. The transmitter side power adaptation aims at an optimization of the resulting bit-error rate by hard-decision and soft-

Intercarrier interference suppression for OFDM transmission at very high velocities
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ABSTRACT In transmission scenarios where the trans-mitter and/or receiver move at very high velocities, the performance of an OFDM-based transmission system can severely suffer from the effects of Doppler. In the presented paper, we therefore propose the application of a

Effect of Turbo Coding on OFDM Transmission to improve BER
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(Orthogonal Frequency Division Multiplexing) is proposed in this paper. Orthogonal Frequency Division Multiplexing (OFDM) has become a popular modulation method in high speed wireless communications. By partitioning a wideband fading channel into flat

High speed OFDM data transmission over 5 km GI-multimode fiber using spatial multiplexing with 2x4 MIMO processing
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ABSTRACT We demonstrated experimentally the transmission of 8 Gbit/s data using the OFDM format over 5 km graded-index multi-mode fiber combining modal diversity, coherent transmission and direct detection with 2x4 MIMO signal processing. Orthogonal frequency division multiplexing (OFDM) is a promising technique to realise high- speed indoor optical wireless (OW) links through the exploitation of the high peak-to- average power ratio (PAPR) for intensity modulation (IM). However, the non-linear

Transmission on indoor power line: from OFDM to DMT
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Abstract The objective of this contribution is to optimize the different modulation schemes and to compare their performances in a power line channel and thus in a frequency selective channel and especially in the presence of a narrow band noise.

Modeling and influences of transmitter and receiver nonlinearities in optical OFDM transmission
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ABSTRACT In this paper, the main sources of non-linear distortions for back-to-back (B2B) transmission in an Intensity Modulation/Direct Detection (IM/DD) fiber optical system are presented. The nonlinear characteristics are modelled and their impact on an OFDM

Cyclostationarity-inducing transmission methods for recognition among OFDM-based systems
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This paper proposes two cyclostationarity-inducing transmission methods that enable the receiver to distinguish among different systems that use a common orthogonal frequency division multiplexing-(OFDM-) based air interface. Specifically, the OFDM signal is

A study on controlling transmission power of carriers of OFDM signal
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ABSTRACT In this paper, a method of carrier power control of OFDM signal for power line communication is proposed. One of the primary factors of degradation of OFDM signal in the transmission channel is frequency selective fading. And the signal to noise ratio of the

Optical OFDM for high-speed transmission
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Abstract Optical orthogonal frequency division multiplexing for high-speed, long-haul optical transmission systems is reviewed. Some important aspects of the systems are discussed and demonstrations of high-speed transmission up to 122 Gbit/s are presented.

42.13 Gbit/s 16qam-OFDM photonics-wireless transmission in 75-110 GHz band
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ABSTRACT We present a simple architecture for realizing high capacity W-band (75-110 GHz) photonics-wireless system. 42.13 Gbit/s 16QAM-OFDM optical baseband signal is obtained in a seamless 15 GHz spectral bandwidth by using an optical frequency comb generator,

OFDM-MFSK with differentially encoded phases for robust transmission over fast fading channels
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ABSTRACT We present a new OFDM-based hybrid trans-mission scheme which is suitable for robust transmission in fast fading environments, where a reliable channel estimate is impossible or very difficult to obtain. Our scheme is based on the combination of

OFDM in optical long-haul transmission
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ABSTRACT In this paper we review two OFDM based ar-chitectures, which have recently been proposed for optical long-haul transmission. The BER performance is investigated in presence of chromatic dispersion and differential group delay. In a further step both

The Cyclic Prefix Length Influence on OFDM-Transmission BER
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is one of the recent years equalization approaches used in order to combat the inter-symbol interference introduced by the frequency selectivity of the radio channels. The circular extension of the data

Orthogonal Frequency Division Multiplexing (OFDM) and other Advanced Options to achieve 100Gb/s Ethernet Transmission
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ABSTRACT Based on the demand for transmission technologies offering high ratio of bits per symbol, two promising candidates to achieve a data rate of 100 Gb/s per optical carrier are discussed, namely optical orthogonal frequency division multiplexing and 16-ary

Blind adaptive equalization of OFDM transmission with insufficient cyclic prefix
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ABSTRACT We create a new blind equalization method with both batch and adaptive algorithms developed for OFDM systems with insufficient cyclic prefix. Special correlation property of cyclic prefix is exploited for constraint estimation. Then constrained minimum-

Adaptive antenna array for reliable OFDM transmission
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Page 1. Adaptive Antenna Array for Reliable OFDM Transmission Shinsuke Hara Department of Electronics, Information System And Energy Engineering, Graduate School of Engineering, Osaka University Page 2. Contents of This Presentation * What are 4G Systems

Simple broadband MIMO-OFDM transmission
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ABSTRACT In this paper we present research results for wire-less transmission systems with linear antenna arrays at the transmitter and the receiver (multiple input multiple output- MIMO) in combination with orthogonal frequency division multiplexing (OFDM) in

Rate-optimized power allocation for OFDM transmission with multiple DF relays and individual power constraints
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ABSTRACT We1 consider an OFDM (orthogonal frequency di-vision multiplexing) point to point transmission scheme improved by means of multiple relays. For each carrier, symbols sent by the source during a first time slot may be retransmitted during a second time slot

Throughput optimization via the packet length and transmission rate for wireless OFDMsystems in downlink transmission
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Summary In this paper we present a mathematical technique for determining the optimum transmission rate and packet size in wireless system that have multi-carriers for OFDM modulation in downlink transmission. The throughput is defined as the number of bits per

Power line data transmission using OFDM and DS/SS systems
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ABSTRACT This paper proposes several systems using OFDM and DS/SS for power line communications and evaluates their BER performances. As for the transmission lines, three kinds of power line models in which several electric apparatus are connected and an LC

Optical OFDM as a promising technique for bandwidth-efficient high-speed data transmissionover optical fiber
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ABSTRACT Application of the orthogonal frequency-division multiplexing (OFDM) technique for optical highspeed fiber communication is reviewed within this paper. Several choices of implementation are discussed as well as special properties of the optical transmission link

Analysis and simulation of the transmission distortions of the mobile digital television DVB-SH Part 1: Terrestrial mode DVB-SH-A with OFDM
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ABSTRACT. This paper deals with the latest digital TV standard DVB-SH (Digital Video Broadcasting-Satellite to Handhelds) with focus on utilization of its advantages for the next generation of mobile TV broadcasting. The whole paper consists of two parts. In this first

Transmission of a 213.7-Gb/s single-polarization direct-detection optical OFDMsuperchannel over 720-km standard single mode fiber with EDFA-only
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ABSTRACT We propose and demonstrate the optical multiband receiving method which supports transmission of a 16-QAM, 213.7-Gb/s (189.7-Gb/s) DDO-OFDM super-channel over 720-km SSMF. After transmission all the 9 OFDM bands exhibit BERs lower than the

Minimum transmission power algorithm for OFDM-based flexible systems
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M Minto, D Ragazzi, L Agarossi on Broadband Wireless 2002 212.234.161.34 QoS-aware, low-power digital transceivers is one of the key challenges for future mobile/wireless systems. Within this framework a reduced-complexity algorithm for fast, joint optimisation of the transmission parameters in OFDM indoor wireless systems is proposed

Experiments on real-time 1-Gbps packet transmission using QRM-MLD with asess in MIMO-OFDM broadband packet radio access
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ABSTRACT This paper presents experimental results on real-time packet transmission of greater than 1 Gbps using 4-by-4 multiple-input multiple-output multiplexing (MIMO) employing Maximum Likelihood Detection (MLD) with a decreased level of computational

7 x 224-Gb/s WDM Transmission of Reduced-Guard-Interval CO-OFDM with 16-QAM Subcarrier Modulation on a 50-GHz Grid over 2000 km of ULAF and Five
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ABSTRACT We demonstrate wavelength-division-multiplexed transmission of seven 224-Gb/s reducedguard-interval CO-OFDM channels with 16-QAM subcarrier modulation on a 50- GHz grid, resulting in a net spectral efficiency of 4 b/s/Hz. Transmission over twenty 100-

2 21 Gbps symmetrical full-duplex transmission of OFDM wireless signals over a bidirectional IMDD radio-over-fiber system at 60 GHz
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ABSTRACT A full-duplex bidirectional 60 GHz RoF system for in-building wireless applications employing DSB IMDD techniques is experimentally demonstrated. Symmetrical 2x21 Gbps transmission over 500-m standard single mode fiber and 2.5-m wireless distance is

An OFDM-based transmission scheme for underwater acoustic multimedia
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ABSTRACT In this paper, we propose an orthogonal frequency division multiplexing based (OFDM-based) underwater acoustic multimedia system. An essential feature of this system is that it offers greater power and schemes with significant error protection for the

Complexity constrained channel estimation for OFDM based transmission over fast fading channels
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1. ABSTRACT For digital transmission in mobile environments channel estimation has prove to be the most critical component as far as both complexity and performance is concerned. The achievable accuracy of the channel estimation is limited rather by complexity than by

OFDM Transmission Techniques
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Chair of Communication Systems NTS OFDM Transmission Techniques Dr.-Ing. L. H ring SS 2013 Page 2. NTS L. H ring OFDM - Orthogonal Frequency Division Multiplexing p. 36 Simplified OFDM transmission chain 3 OFDM Basics 3.2 OFDM as special case Page 37.

Throughput enhancement for MIMO OFDM systems using transmission control and adaptive modulation
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ABSTRACT Future mobile communication systems will adopt the multiple antennas at both transmitter and receiver to improve system capacity and spectral efficiency. In such MIMO (Multiple Input Multiple Output) system, a channel separation method is indispensable

OFDM Transmission Corrupted by Colored and Narrow Band Noise
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ABSTRACT This paper deals with the influence of the colored and narrow band noise of the power line channel on the performances of an OFDM transmission. The performances are studied in terms of bit error rate owing to a simulator in which the transmission chain and

Wavelength reused bidirectional adaptively modulated optical OFDM transmission in colourless WDM-PONs
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ABSTRACT 10Gb/s downstream and 6Gb/s upstream over 40km SSMFs are feasible for doublesideband AMOOFDM signals in wavelength-reused bidirectional-transmission colorless-WDM-PONs incorporating SOA/RSOA intensity modulators in OLTs/ONUs. Such

Modelling of an OFDM transmission technique for powerline using UNIX based COSSAP and powerline channel simulator
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ABSTRACT This paper suggests a novel, low power, minimally-intrusive, method of gaining an insight into power line channel behaviour. The technique proposed enables the user to simulate models with power line noise and frequency/attenuation characteristics without

Peak Reduction Schemes in OFDM Transmission
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Orthogonal Frequency Division Multiplexing (OFDM) is one of the most important techniques for recent wireless communication systems deployed by wireless LAN, Worldwide interoperability for Microwave Access (WiMAX)* 1, 3rd Generation Partnership Project

Cooperative MIMO Transmission Based on Multiple Base Station Coordination for OFDMCellular Systems
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OFDM (Orthogonal Frequency Division Multiplexing) modulation is attracting attention as the wireless transmission technology for the next generation (3.9 G/4G) cellular mobile radio systems, due to its many advantages such as high spectral efficiency in multi-path fading

A Decision Metric approach to PAPR performance analysis of an OM-OFDM Transmission
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K Dhuness, P Botha, BT Maharaj Southern Africa Telecommunication satnac.org.za ABSTRACT In this paper, a novel method called offset modulation (OM-OFDM) is proposed, to control the peak-to-average power ratio (PAPR) of an OFDM signal. The theoretical bandwidth occupancy of the proposed offset modulated signal is derived. Using this

Precise Timing Synchronization Algorithm for Burst MIMO-OFDM Transmission
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E Zhou, Z Zhang, H Kayama nttdocomo.co.jp Wireless packet communication, where signals are transmitted in units of short bursts, is regarded as an effective transmission method for future mobile communications which will have many degrees of freedom and will include many different types of applications and

The marriage of subband coding and OFDM transmission
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TA Ramstad Proc 6th Baiona Workshop on Signal 2003 ambienthardware.com ABSTRACT Bandwidth efficient communications depend on a system's ability to take into account source statistics as well as channel properties. Source-channel coding can in principle exploit both these properties and thus get close to OPTA (optimal performance

Analysis of a Wireless Transmission system based on OFDM
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Executive Summary This guided research project aim to develop a better understanding of the operational characteristics of an OFDM system under multipath conditions. During the course of the project a Rayleigh fading multipath channel model was developed and used

Terabit transmission of high capacity multiband OFDM superchannels on field deployed single mode fiber
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Abstract We demonstrate transmission of 5x253-Gb/s optical OFDM-superchannels in 100- GHz spacing over 454 km field deployed fibers, achieving a capacity of 1.16 Tb/s. In addition transmission of 398.5 Gb/s in one OFDM channel over the same distance is reported.

Experimental performance comparison of 60 GHz DCM OFDM and impulse BPSK ultra-wideband with combined optical fibre and wireless transmission
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Abstract We present an experimental performance comparison of 1.44 Gbps dual-carrier modulation OFDM and BPSK impulse-radio ultra-wideband in the 60GHz band with combined fibre, up to 40km, and 5m wireless transmission. Impulse-radio exhibits better

Data Transmission Over Pilot Tones in OFDM based Wireless Systems
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ABSTRACT Pilots till date are used only for transmitting a known sequence for synchronization. In such systems pilots and training sequences are transmitted with the same minimum power governed by the modulation scheme used in the data sub carriers.

Unequal power allocation of image transmission in OFDM systems
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ABSTRACT The OFDM technique with cyclic time guard, which has been proposed for broadband communications, is an increasing approach to combat the frequency selectivity of the channel. In this paper, a modified OFDM scheme for image transmission is

Optimization of inter-satellite link (ISL) in hybrid OFDM-IsOWC transmission system
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ABSTRACT Inter-satellite optical wireless communication system (IsOWC), one of the important applications of FSO (Free Space Optics) technology, will be deployed in space in the near future because of providing power efficient and high bandwidth allocation

Performance Analysis of Coded OFDM Signal for Radio over Fiber Transmission
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ABSTRACT The main aim of this paper is to analyze the influence of the modulation techniques; on the performance of coded orthogonal frequency-division multiplexing (COFDM) based Radio over Fiber (RoF) system. The modelling of the COFDM scheme for

of a Cooperative OFDM system with implementation of Decode and Forward and Amplify and Forward Relaying Protocols on Text message transmission
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ABSTRACT Cooperative diversity is a newly proposed virtual MIMO technology based transmission technique achieving diversity gain through a combination of the relayed signal and the directly transmitted signal. In this paper, we made a comprehensive study to

Comparison of Frequency Offset Estimation Methods for OFDM Burst Transmission in the Selective Fading Channels
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ABSTRACT In this paper the performance and complexity of several frequency offset estimation schemes for the OFDM (Orthogonal Frequency Division Multiplexing) burst transmission in the selective fading channels have been compared. This topic becomes

A new transmission strategy for scalable multimedia data on OFDM systems
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ABSTRACT We consider the real time transmission of scalable multimedia data with a constrained end-to-end Quality of Service. In the Rayleigh channel case, the resulting optimization problem is solved by the Flexible Transmission (FT) algorithm. This resources

Adaptive Transmission Power Control for MIMO Diversity Employing Polarization Diversity inOFDM Radio Access
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ABSTRACT This paper proposes an adaptive transmission power control scheme between cross-polarized transmission antennas for multiple-input multiple-output (MIMO) diversity using polarization diversity in orthogonal frequency division multiplexing (OFDM), in order

Comparative study between selection mapping technique (SLM) and partial transmissionsequence (PTS) for PAPR reduction in OFDM signals
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a very attractive technique for high-data-rate transmission in wireless and wired applications. One major disadvantage of OFDM is that the time domain OFDM signal which is a sum of several sinusoids leads to

An OFDM-based distributed transmission scheme for uncoordinated transmitters without carrier frequency and timing synchronization
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ABSTRACT Distributed transmission involving multiple uncoordinated transmitters has become a popular subject in wireless communications, such as cooperative transmissions, relaying, distributed MIMO, network coding, multi-access and multiuser detection. One of

Experimental evaluation of interference from MB-OFDM UWB systems to narrowband wireless digital transmission systems
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ABSTRACT Multi-band orthogonal frequency-division multipleaccess (MB-OFDM) is one of the UWB technologies that realize wireless personal network (WPAN). In this paper, we experimentally investigated the interference from MBOFDM signal to narrowband QPSK

Design of MIMO OFDM SDM Systems for High Speed Data Transmission
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ABSTRACT A combination of Multiple-Input Multiple-Output Spatial Division Multiplexing technology and Orthogonal Frequency Division Multiplexing technique, namely MIMO- OFDM SDM systems, been well-known as a potential technology to provide high speed

Polarization-Time Coded OFDM for PDL Mitigation in Long-Haul Optical TransmissionSystems
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ABSTRACT We experimentally demonstrate the potential of Polarization-Time codes in mitigating PDL in long-haul transmissions. The Silver code exhibits the best performance (2dB Q-penalty reduction at a PDL of 6dB). Moreover, for inline PDL, it improves the mean

NLOS QPSK OFDM with Concatenated Reed-Solomon/Convolution Coding for DataTransmission over Fading Channels
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ABSTRACT The work presented herein, provides a link level (physical level) performance analysis for non line of sight (NLOS) QPSK-OFDM for data transmission over Rayleigh fading channels. During simulations three different scenarios has been considered. First,

An adaptive power allocation scheme for robust transmission of jpeg compressed images over MIMO-OFDM systems
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ABSTRACT Multiple-input multiple-output (MIMO) wireless technology in combination with Orthogonal Frequency Division Multiplexing (OFDM) is a promising solution for implementing efficient next-generation wireless local area networks (WLANs) and fourth-

Energy Efficient Colour Image Transmission using DWT-OFDM System
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ABSTRACT In many applications retransmission of lost packets are not permitted. OFDM is a multi-carrier modulation scheme having excellent performance which allows overlapping in frequency domain. With OFDM there is a simple way of dealing with multipath relatively

Field Experiments of 2.5 Gbit/s High-Speed Packet Transmission Using MIMO OFDMBroadband Packet Radio Access
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The maximum target data rate for the future mobile communication systems beyond Third- Generation system is greater than 1 Gbit/s in Recommendation ITU-R M. 1645 . Using Variable Spreading Factor (VSF)* 1-Spread Orthogonal Frequency Division Multiplexing (

Prioritized Multi-layer Transmission for MIMO-OFDM Multiuser Broadcast Channel
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ABSTRACT In this paper, three different users, with three different qualities of service (QoSs) are allowed to share the same frequency using different space and modulation layers. A multiple-input multiple-output (MIMO) antenna transceiver combined with orthogonal

Adaptive Data Transmission in Downlink MIMO-OFDM Systems with Pre-Equalization.
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ABSTRACT An optimization algorithm for finding user alloca-tion, bit and power loading in the downlink of MIMO-OFDM systems is proposed. The algorithm represents a generalization of the well-known concepts of LQ decomposition with row pivoting and waterfilling.

Real-time DSP-based optical OFDM transmission
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ABSTRACT We present the design of a field programmable gate array (FPGA) based optical orthogonal frequency division multiplexing (OFDM) transmitter operating at 21.4 GS/s and an experimental assessment of its performance in a directly-detected 8.34 Gbit/s QPSK-

A Partial Proposal of Rotational OFDM Transmission Scheme
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Abstract As a partial proposal, this contribution discusses the rotational OFDM transmission scheme, which improves spectrum efficiency at the multi-path channel by making use of frequency diversity effect. This scheme can be applied to multi-carrier systems such as

Blind Demodulation for CP-OFDM and ZP-OFDM transmission over frequency selective channels
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ABSTRACT In this paper, we focus our attention on blind demodulation for multi-carrier modulation in the context of radio surveillance and military applications. We present a blind demodulation technique for CP-OFDM and ZP-OFDM transmission over frequency

A Study on Controlling Transmission Power of OFDM Carriers Combined with Data Symbol Spreading using Optimal Data Reconstruction
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Abstract We have already proposed joint optimization data spread OFDM transmission combined with carrier power control that makes it possible to improve the bit error rate characteristic [5]. However, by using data spreading, the performance under low carrier to

OFDM data-aided channel equalizer for already-deployed optical direct-detectiontransmission systems
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ABSTRACT We study the performance of an adaptive weighted channel equalizer for direct- detection dispersioncompensated OFDM transmission system and show that it improves the BER and reduces the overhead and sensitivity to the optical channel variations.

GERHARD FETTWEIS PERFORMANCE COMPARISON OF OFDM TRANSMISSIONAFFECTED BY PHASE NOISE WITH AND WITHOUT PLL
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Abstract. Oscillator phase noise present in OFDM systems limits the performance by producing a common phase error and additional intercarrier interference. While phase noise is most often modelled as a Wiener process corresponding to free running oscillators, we

Effect of OFDM Transmission Mode on Frequency Synchronization Performance
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Abstract This paper investigates the effect of orthogonal frequency division multiplexing (OFDM) transmission mode on the performance of the cyclic prefix-(CP) based frequency synchronization technique. An OFDM block consists of the inverse fast Fourier transform (

Pulse Shaping vs. OFDM Transmission Techniques for InHome Power Line Communications
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The nature of the transmission medium (the electrical cable) and possible power/interference constraints coming from coexistence issues, forces Power Line Communication (PLC) signals to respect some emission limits [1, Chap. 5]. Within this

Data transmission with OFDM technique using soliton carriers
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ABSTRACT OFDM provides both high data rate and symbol duration with overlapping sub carriers without causing inter carrier interference using frequency division multiplexing (FDM) over multi sub carriers within one channel. On the other hand solitons are famous

Transmission of Digital Information using OFDM
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S Arora, P Bajpai idc-online.com ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) as needed for the wireless communication system is proven. OFDM has already been applied in the wireless LAN and it is also used with the Multiple Input Multiple Output (MIMO) technique to improve the transmission

For OFDM Transmission Systems
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ABSTRACT This paper presents a bandwidth efficient self-cancellation scheme for interchannel interference (ICI) in OFDM transmission systems. Conventional selfcancellation schemes provide an excellent cancellation capability of ICI for relatively low frequency

Cyclic Prefix Reduction Technique for Direct-Detection Optical OFDM Transmission over Long-distance of SSMF
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Multiplexing (O-OFDM) is now used by a number of researchers because it provides major advantages in mitigating Group-Velocity Dispersion (GVD) in Single Mode Fiber (SMF). Unfortunately, when the uncompensated long-haul transmission ranges become very

Long-Haul WDM Transmission Using No-Guard-Interval Coherent Optical OFDM
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Introduction 100-Gb/s-class transmission technologies are being extensively investigated for backbone optical transport networks (OTN) based on WDM transmission [1, 2]. In such high-speed long-haul WDM systems, excellent system resistance to chromatic dispersion (CD) and

Database Based Phase Noise Compensation in CO-OFDM Transmission
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ABSTRACT In this paper, a new approach of establishing database to estimate phase noise due to chromatic dispersion is proposed. The database can be used to compensate phase shift without using any pilot carriers, which results in high spectral efficiency and low BER.

Performance Elevation Criteria of RS coded OFDM Transmission over noisy channel
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A Katariya, N Jain, A Yadav International Journal of Soft Computing and ijsce.org ABSTRACT OFDM has recently been applied widely in wireless communication system due to its high data rate transmission capability with high bandwidth efficiency. Error control codes are used to protect information from errors that can occur during transmission Reed

Higher Spectral Efficiency Coherent Optical OFDM Transmission With Iterative Polar Modulation
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KS Kumari, MA Kumar iosrjournals.org ABSTRACT Achieving high spectral efficiency in optical transmissions has recently attracted much attention, aiming to satisfy the ever increasing demand for high data rates in optical fiber communications. Therefore, strong Forward Error Correction (FEC) coding in

AN ITERATIVE RECEIVER DESIGN FOR MIMO OFDM TRANSMISSION OVER TIME VARIANT SPATIALLY CORRELATED CHANNELS
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ABSTRACT In this paper, we consider receiver design for space time block coded MIMO OFDM transmission over frequency selective block fading channels. The receiver employs the Expectation Maximization (EM) algorithm for joint channel and data recovery. It makes

A Review on PAPR Reduction Techniques in MIMO OFDM Transmission
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ABSTRACT Wireless Communication is one of the major aspects of life. The progression in age and its growing demands, there has been rapid development in the field of communication. For better transmission system single carrier waves are being replaced by multi carrier

Initial Weights for Improving Convergence Characteristics in Mobile Reception of the MMSE Adaptive Array for OFDM Transmission
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HKNKH Hirayama, K Sakakibara ap-s.ei.tuat.ac.jp It is known that the OFDM (Orthogonal Frequency Division Multiplexing) transmission technology is used in the terrestrial digital TV broadcasting and wireless LAN. The OFDM is featuring high efficiency of frequency utilization and also effective use of FFT in the

Reduction of Error for Load Forecasting using Fuzzy Programming and OFDM Transmission
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ABSTRACT Today, it is very important for developed and developing countries to consume electricity more efficiently. Though developed countries do not want to waste electricity and developing countries cannot waste electricity. This leads to the concept Load Forecasting.

Compromise between Guarg Interval and Orthogonality in OFDM Transmission
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ABSTRACT Transmission of higher rates on frequency selective channels is nowadays a challenge. The multicarrier modulations can made a good way to achieve the desired rates on this type of channels. Based on the simultaneous transmission of user data on a

Study on Improvement of Convergence Characteristics of the Blind MMSE Adaptive Array inOFDM Transmission System
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YINKH Hirayama, K Sakakibara ap-s.ei.tuat.ac.jp It is well known that the OFDM (Orthogonal Frequency Division Multiplexing) transmission technology is used in the terrestrial digital TV broadcasting and wireless LAN. The OFDM is featuring high efficiency of frequency utilization and also effective use of FFT in the

CO-OFDM Technology Long Distance Transmission System
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ABSTRACT Analysis of CO-OFDM single-mode optical fibre transmission system model, studied the timing deviation on the system synchronization performance, and used the Zadoff-Chu pilot sequence to realize the system synchronization, and concludes that the

A Study on Adaptive Subcarrier Modulation in OFDM Transmission Combined with SubcarrierTransmission Power Control
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ABSTRACT In this paper, an adaptive modulation scheme of OFDM subcarriers combined with a subcarrier transmission power control scheme is proposed in order to increase total data transmission rate. In the proposed scheme, it is assumed that bi-directional data

A New OFDM Transmission Scheme Using Orthogonal Code Multiplexing
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ABSTRACT We propose an effective orthogonal frequency division multiplexing (OFDM) transmission scheme using orthogonal code multiplexing (OCM). This scheme makes all modulation symbols have the same reliability even in a frequency selective fading

Methods for Reducing Peak Power in OFDM Transmission
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Many recent mobile communications systems, such as the 3rd Generation Partnership Project (3GPP)-Long Term Evolution (LTE) as well as the Institute of Electrical and Electronics Engineers (IEEE) 802.11 wireless LAN technology and digital terrestrial

Real-Time BER Test for Real-Time Optical OFDM Transmission System
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Real-time BER Test for Real-time Optical OFDM Transmission System HAN DUN1,a, ZIWEI XUE2, CHAOXING XU3, YINGCHUN LI4 An experiment setup demonstrate the dramatic real-time property and effectiveness in testing the optical OFDM transmission system.

Parallel Interference Canceller with Adaptive MMSE Equalization for MIMO-OFDM Transmission
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ABSTRACT The combination of multiple-input multiple-output (MIMO) signal processing with orthogonal frequency division multiplexing (OFDM) using Cyclic Prefix (CP) is regarded as a highly promising solution to achieving the data rates of next-generation wireless

Iteratively Detected Twisted-Pair MIMO-OFDM Transmission with Far-End Crosstalk
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ABSTRACT Crosstalk between neighbouring wire pairs in multi-pair copper cables has long been seen as an major source of disturbance that essentially limits the transmission quality and the throughput of such cables. However, van Ettens pioneering work has shown that

Experiences in establishing a digital C-OFDM transmission network
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ABSTRACT With the advent of digital terrestrial television broadcasters and equipment manufacturers alike are facing new challenges. Although the ETSI standard defines very precisely the coding and modulation to be employed for the C-OFDM principle for TV

Comparison of Bit Error Rate Estimation Methods for QPSK CO-OFDM Transmission
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ABSTRACT In this letter, we experimentally study the statistical properties of a received QPSK modulated signal and compare various bit error rate (BER) estimation methods for coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission. We show that

OpenFlow-Controlled Elastic Optical Networks with Direct-Detection Optical OFDM (DDO-OFDM) Transmission
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ABSTRACT We design and deploy an extended OpenFlow-based control plane for elastic optical networks with DDO-OFDM transmission, detailing the network architecture, the two- phase routing and spectrum assignment algorithm, OpenFlow protocol extensions and the

Image Transmission on Wireless Network by Using Ofdm Technology with Rayleigh Fading Channel
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ABSTRACT In this paper, an gray scale (8 bit) bit map image is transmitted by the transmitter and by using the orthogonal frequency division multiplexing with through the Rayleigh fading channel. individual frame is transmitted in parallel so that multi input channel can

RF-pilot-based nonlinearity compensation in frequency domain for CO-OFDM transmission
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ABSTRACT The effects of fiber nonlinearity in Coherent Optical Orthogonal Frequency- Division Multiplexing (CO-OFDM) transmission, such as self-phase modulation (SPM) and cross-phase modulation (XPM), are a major concern. In this paper, we investigate the use

MIMO-OFDM Transmission Using Complexity Reduced Near ML Detection
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ABSTRACT QR decomposition and M-algorithm based near maximum likelihood detection (QRM-MLD) is a promising detection scheme for multiple-input multiple-output (MIMO)- orthogonal frequency division multiplexing (OFDM). However, QRM-MLD requires still

Kanalsch tzung in einem OFDM- bertragungssystem Estimation de canal dans un syst me de transmission OFDM
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Analysis of end-of-burst degradation in the OFDM UL PHY under mobile conditions", IEEE 802.16 Bradband Wireless Access Working Group, vol. IEEE 802.16 Bradband Wireless Access Working Group, no. IEEE C802.

Reed-solomon space-frequency block cdes for MIMO-OFDM transmission
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ABSTRACT In this thesis, Reed-Solomon Space-Frequency Block Codes are proposed as a MIMO-OFDM transmission scheme. The special feature of Reed-Solomon Space-Frequency Block Codes is the Gaussian integer field signal constellations. The bit level Reed-

Receiver Design for MIMO OFDM Transmission over Time Variant Channels
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ABSTRACT This paper considers receiver design for space time block coded MIMO OFDM transmission over frequency and time selective channels. The receiver employs the expectation-maximization algorithm for joint channel and data recovery. It makes

Performance of serially concatenated channel coding with space time block coding in OFDM transmission systems
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Abstract. It is well known that space-time diversity using space-time coding (STC) is an effective technique to improve wireless communication performance. STC was designed for flat fading channel and consists of space-time trellis code (STTC) and space-time block

TURBO CODING ON OFDM TRANSMISSION TO IMPROVE BER
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Abstract A model of Turbo code based on OFDM (Orthogonal Frequency Division Multiplexing) is proposed in this paper. Orthogonal Frequency Division Multiplexing (OFDM) has become a popular modulation method in high speed wireless communications. By

Multiband OFDM Transmission in RoF Systems
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Abstract In this paper, a study on the transmission of multiband-OFDM (MB-OFDM) UWB- based signals in a Radioover-Fibre (RoF) system is presented. Some simulations are made and EVM parameter is analyzed to evaluate the performance of the system for different bit

Energy Efficient OFDM Transmission Scheme based on Continuous Phase Modulation
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ABSTRACT In this paper we propose an energy efficient OFDM transmission scheme. Two CPM (continuous phase modulation) schemes are introduced to OFDM, keeping in view the constant envelope and continuous phase changing nature of CPM modulation. Energy

A COMBINED SLM AND CLOSED-LOOP QO-STBC FOR PAPR MITIGATION IN MIMO-OFDM TRANSMISSION
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Abstract A closed-loop quasi-orthogonal space time block coding scheme developed by Toker, Lambothoran and Chambers has much attraction due to its full diversity and full rate. This scheme exploits feedback from the receiver to the transmitter and rotation of certain

Transmission characteristics of 4x4 MIMO system with OFDM multiplexing and Markov Chain Monte Carlo Receiver
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ABSTRACT A detailed analysis of the performance of 4 4 Multiple Input Multiple Output (MIMO) antenna system has been carried out using Orthogonal Frequency Division Multiplexing (OFDM) techniques. The transmission characteristics are determined for

TO IMPROVE BIT ERROR RATE OF OFDM TRANSMISSION USING TURBO CODES
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ABSTRACT This review paper deals with the concept of Turbo coded OFDM (Orthogonal frequency division multiplexing) which improves the system throughput. Orthogonal frequency division multiplexing is a popular modulation method in high speed wireless

Iterative receiver design for coded MIMO systems on SC/OFDM transmission
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Abstract Recently, researches on multiple-input multiple-output (MIMO) technique deploying multiple transmit and receive antennas have abruptly emerged due to its potential to greatly improve spectral efficiency. Representatively, V-BLAST (Vertical Bell Laboratories

Road side unit coverage extension with OFDM Cooperative Transmission
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ABSTRACT Intelligent Transport System (ITS) has drawn attention as new important technologies for vehicular safety. Additionally, roadside to vehicle communication is also focused because it provides network services such as an Internet access from vehicles. It

SISO and MISO Architecture Investigation for Wireless Optical OFDM Transmission
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Abstract As the need for demanding communication applications is increasing, the high speed connectivity has become a very significant issue. Thus, the study of optical wireless communication systems can lead to more efficient transmission schemes and techniques

Improvement in SNR with digital coding technique in OFDM transmission system
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ABSTRACT The paper describes the transmission of 32-QAM signals in an OFDM system with 128-point IFFT at transmitter and FFT at receiver. The channel over which transmission will take place is AWGN channel. Cyclic prefix for OFDM is calculated for improving bandwidth

Photonic layer security in fiber-optic networks and optical OFDM transmission
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Abstract Currently the Internet is experiencing an explosive growth in the world. Such growth leads to an increased data transmission rate demand in fiber-optical networks. Optical orthogonal frequency multiplexing (OFDM) is considered as a promising solution to

Scrambled Voice Frequency Signal Transmission in an Amplify and Forward Relaying Based STBC Encoded Cooperative MIMO-OFDM System.
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Abstract In this paper, a comprehensive study has been made on performance assessment of a single relayed cooperative wireless communication system under implementation of OFDM aided MIMO technology. This paper provides a new insight on system performance

An efficient rate allocation scheme with selective weighted function for optimum peak-to-average power ratio for transmission of image streams over OFDM
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ABSTRACT This paper proposes new scheme for efficient rate allocation in conjunction with reducing peak-to-average power ratio (PAPR) in orthogonal frequency-division multiplexing (OFDM) system. Modification of the set partitioning in hierarchical trees (SPIHT) image

DCT Based Modified SLM Technique for PAPR Reduction in OFDM Transmission
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a promising multicarrier technique used in wireless transmission with high data rate and high bandwidth efficiency. One of the major drawbacks of OFDM transmission is high Peak to Average Power Ratio

Transmission Performance of Multiplexed OFDM Signals Over Optical Access Network Architectures Employing RSOAs
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ABSTRACT Next generation access wavelength division multiplexed passive optical networks (WDM-PON) employing colorless transmitters may be foreseen to support both wired and wireless services. Although allowing for simple and transparent implementations, analog

PAPR Reduction in MIMO-OFDM Using Hadamard Transform for Image and VideoTransmission
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is one of the most promising technologies to achieve High data rate wireless communications that demands robustness, high spectral efficiency, frequency selective fading, and low computational complexity.

The Performance Evaluation of OFDM/HL-16QAM System for Optimizing ImageTransmission Quality in Wireless Fading Channel
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OFDM/HL-16QAM system is an OFDM system which employs a hierarchical 16QAM and has the capability of reliable high speed data service and simultaneous transmission of differentiated two quality of data streams in severe multipath fading channel. The wireless

Adaptive multiuser receivers scheme for MIMO OFDM over iterative-equalization for single-carrier transmission
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Adaptive multiuser receivers scheme for MIMO OFDM over Iterative-Equalization for Single- Carrier Transmission, which we refer to as Iterative AMUD MIMO OFDM. It involves the joint iteration of the adaptive minimum mean square error multiuser detection and decoding

Comparison of OFDM and Single Carrier Transmission in Power Line Communications
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ABSTRACT Orthogonal frequency division multiplexing (OFDM) is a suitable candidate for broadband power line communications (PLC). It has shown that the Bit Error Rate (BER) performance of Single Carrier Transmission with Frequency Domain Equalization (SCT-

MIMO BASED STBC-OFDM SYSTEM ON TEXT MESSAGE TRANSMISSION
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(STBC) orthogonal frequency-division multiplexing (OFDM) a simple paradigram for communication over fading channels using multiple transmit antennas. Space time block codes are designed to achieve the maximum diversity order for a given number of transmit

Design a Transmission Policies for Decode and Forward Relaying in a OFDM System
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a leading physical layer transmission technique for high spectral efficiency and date rate in broadband wireless communication systems. Combining relaying architecture with OFDM transmission is a

Adaptive Air Interface Schemes for MAGNET Based on OFDM-TDMA Transmission
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ABSTRACT A transmission system employing orthogonal frequency-division multiplexing (OFDM) with bit-interleaved coded modulation (BICM) and perfect channel state information (CSI) at both transmitter and receiver is considered. Different adaptive schemes for

Robust Image Transmission with OFDM over an AWGN Channel
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Multiplexing (OFDM) system with Low Density Parity Check Coding (LDPC). Trigonometric transforms are used in this scheme for improving the performance of the OFDM systems and reducing the Peak-to-Average Power Ratio (PAPR) of OFDM signal. It improves the error resilience

Transmission Signal Quality Comparison of SCM and OFDM according to the Phase Noise Characteristics of the Local Oscillator
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ABSTRACT This paper examines the transmission signal quality differences between SCM (Single Carrier Modulation) method and OFDM (Orthogonal Frequency Division Multiplexing) method by analyzing how the phase noise characteristics of the local

Image Transmission using M-QAM OFDM System over Composite Fading Channel
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ABSTRACT This paper is focused on the transmission of images using M-QAM OFDM system over Composite Fading channel. Recently proposed Generalized K Fading channel is very versatile channel which accurately approximates many of the commonly used channel

An Efficient Channel Model for OFDM and Time Domain Single Carrier Transmission Using Impulse Responses
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Abstract The OFDM (Orthogonal Frequency Division Multiplexing) is well-known, most utilized wideband communication technique of the current era. SCT (Single Carrier Transmission) provides equivalent performance in time domain while decision equalizer

An Improved Transmission Rate Achievement in Cooperative Communication System Based on OFDM
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Abstract. Recently, cooperative system is an interesting issue in communication systems. Single mobile antenna can have transmission diversity gain by the cooperative system as multiple input multiple output (MIMO) system. However, the most of the cooperative

Secure Color Image Transmission in a Downlink JP-COMP Based MIMO-OFDM Wireless Communication System
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ABSTRACT In this paper, we made a comprehensive BER (bit error rate) performance simulative study on secure color image transmission in a joint processing-coordinated multipoint aided MIMO-OFDM (multiple input multiple output-orthogonal frequency

OFDM MMF Optical Communication Transmission System Based on Mode Group Division Multiplexing
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To increase the transmission capacity of multimode fiber (MMF) drastically, Mode Group Division Multiplexing (MGDM), an optical MIMO technique, can be applied. With MGDM, different mode groups, propagating in MMF are used to carry different information. In this

Transmission Signal Quality Using OFDM 4G Networks
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ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a key technique for achieving high data rates and spectral efficiency requirements for wireless communication systems. This work presents a modeling and simulation of OFDM based on WLAN

Implementation of 10Gbps Downstream OFDM-EPON Transmission System
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ABSTRACT For the increasing demand for capacity of optical transmission systems, Ethernet- PON comes out to be a most prominent and assuring solution in todays world. The deployment of Ethernet-PON provides the evolution path to ever higher bandwidths. With

The selective transmission with majority even/odd subcarriers for increasing the datatransmission throughput in OFDM based cognitive radio systems
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ABSTRACT The novel method for increasing the data transmission throughput in OFDM based Cognitive Radio system was proposed. If only even or odd subcarriers are assigned to input, the symmetrical IFFT output is generated. By using the property of symmetry, only half part

Compensating the nonlinearity of laser diode in optical wireless transmission using OFDM
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ABSTRACT The nonlinear characteristic of an laser diode, LD, impacts on the performance of optical wireless systems using OFDM (orthogonal frequency division multiplexing). First, the influence of the nonlinear characteristic on bit-error performance is analyzed using a high

SECURED TEXT MESSAGE TRANSMISSION IN PRE-CHANNEL EQUALIZATION BASED MIMO-OFDM SYSTEM WITH IMPLEMENTATION OF
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Abstract In this paper, we made a comprehensive performance evaluative study of a secured MIMO Orthogonal Frequency-Division Multiplexing wireless communication system with implementation of two pre channel equalization techniques such as Pre-Minimum

Performance Analysis of OFDM Data Transmission With Respect to Novel High Speed RS Decoding With VLSI Implementation
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Abstract In this paper, we have analyzed the performance characteristics of OFDM data transmission with regard to a new high speed RS decoding algorithm. The various characteristics identified are mainly speed and accuracy of the transmission irrespective of

Role of Contributing Factors MIMO-OFDM in 4G-LTE Wireless Transmission Technologies from Technical Perspective
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ABSTRACT This paper studies the role of MIMO-OFDM as foremost contributing performance factors in 4G LTE Wireless Transmission Technology from a technical perspective. Long Term Evolution (LTE) uses Orthogonal Frequency Division Multiplexing (OFDM) along

Implementation of Discrete Wavelet Transmission for Color Image Transmission in OFDM
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ABSTRACT Orthogonal frequency division multiplexing technique is most widely used for high speed broadcast purposes it is one of the most useful technologies for the present and future wireless communications. The data bits are encoded to multiple sub-carriers using

A Data Transmission Game in OFDM Wireless Networks Taking into Account Power Cost
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ABSTRACT The goal of this work is to extend the model from Altman E., Avrachenkov K., Garnaev A." Closed form solutions for water-filling problems in optimization and game frameworks" for the case with different fading channel gains and also taking into account

Nonlinear Transmission Performance of Very High Spectral Efficiency WDM Comparing Nyquist Pulse Shaping and OFDM
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ABSTRACT The long distance transmission performance of Nyquist-WDM and OFDM, using PDM-QPSK at baud rate channel spacing, is investigated over uncompensated single mode fibre. Results show similar performance for both signal formats and good agreement with

SYNCHRONISATION DES SYSTEMES DE TRANSMISSION MIMO-OFDM
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Orthogonal frequency division multiplexing (OFDM) has become a popular technique for transmission of signals over wireless channels. OFDM has been adopted in several wireless standards such as digital audio broadcasting (DAB), digital video broadcasting (DVB-T),

Implementation of Unequal Error Protection for SPIHT coded Grayscale Image Transmissionusing OFDM System
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ABSTRACT In this paper, the implementation of Unequal Error Protection for SPIHT coded Grayscale Image Transmission using OFDM system is proposed to address the issue of image transmission and reception over noisy AWGN channel. Set Partitioning in

Transmission Adaptation for Broadband Wireless MIMO-OFDM Systems with Limited Feedback
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ABSTRACT This paper studies link adaptation technique for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with limited feedback. In order to utilize highly fluctuating MIMO channel efficiently and reliably, spatial mode

Transmission of 60 GHz Ultra Wideband Radio over Optical Fiber Using MB-OFDM
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ABSTRACT Ultra wideband radio over optical fiber (UROOF) technique enables the transmission of ultra wideband (UWB) radio signals over optical fibers by superimposing the UWB radio frequency signals of several gigahertz's on the optical continuous-wave carrier

A Design of FIS Based Adaptive OFDM System for Optimized Transmission of Grayscale Images
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ABSTRACT In this paper, we implement adaptive modulation in OFDM system using Mamdani Fuzzy Inference System (FIS) to transmit grayscale images over AWGN channel. The value of QAM modulation order (M) is decided by using a Mamdani Fuzzy Inference System that

Multi channel Transmission over the space-time-frequency Multi path Multiband-OfDMBased Ultra-Wideband MIMO Communication System
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ABSTRACT The emerging ultra wideband (UWB) system offers a great potential for the design of high speed short-range wireless communications. In order to satisfy the growing demand for higher data rates, one possible solution is to exploit both spatial and multi

A REVIEW ON UNEQUAL POWER ALLOCATION FOR IMAGE AND VIDEOTRANSMISSION OVER OFDM SYSTEM
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ABSTRACT Irregular image codes can have capacity approaching performance with an iterative BP decoder under AWGN channel with BPSK modulation. Normally in BPSK modulation, every bit within the block has the same power. In this paper, we will try to study unequal

Comparison of Bit Error Rate Estimation Methods for QPSK CO-OFDM Transmission
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ABSTRACT In this letter, we experimentally study the statistical properties of a received QPSK modulated signal and compare various bit error rate (BER) estimation methods for coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission. We show that

Image Transmission on Wireless Network by Using Ofdm Technology with Rayleigh Fading Channel
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Abstract In this paper, an gray scale (8 bit) bit map image is transmitted by the transmitter and by using the orthogonal frequency division multiplexing with through the Rayleigh fading channel. individual frame is transmitted in parallel so that multi input channel can

CO-OFDM Technology Long Distance Transmission System
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ABSTRACT Analysis of CO-OFDM single-mode optical fibre transmission system model, studied the timing deviation on the system synchronization performance, and used the Zadoff-Chu pilot sequence to realize the system synchronization, and concludes that the

Real-Time BER Test for Real-Time Optical OFDM Transmission System
free download

An experiment setup demonstrate the dramatic real-time property and effectiveness in testing the optical OFDM transmission system.

Design a Transmission Policies for Decode and Forward Relaying in a OFDM System
free download

ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is a leading physical layer transmission technique for high spectral efficiency and date rate in broadband wireless communication systems. Combining relaying architecture with OFDM transmission is a

An Improved Transmission Rate Achievement in Cooperative Communication System Based on OFDM
free download

Abstract. Recently, cooperative system is an interesting issue in communication systems. Single mobile antenna can have transmission diversity gain by the cooperative system as multiple input multiple output (MIMO) system. However, the most of the cooperative

Design of MIMO OFDM SDM Systems for High Speed Data Transmission
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Abstract A combination of Multiple-Input Multiple-Output Spatial Division Multiplexing technology and Orthogonal Frequency Division Multiplexing technique, namely MIMO- OFDM SDM systems, been well-known as a potential technology to provide high speed

ICI Cancellation Using Zero-padded Conjugate Transmission: With Adaptive Receiver forOFDM System
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Interference (ICI) in OFDM system, the Zero-padded Conjugate scheme with adaptive receiver is proposed. In the conjugate algorithm first path contains the regular OFDM signal and in second path conjugate of first path is transmitted using Time Division multiplexing (

High-speed Downhole Transmission System and Its Synchronization Algorithm Based on Optical OFDM.
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ABSTRACT To overcome the shortcomings of low transmission rate due to limited bandwidth in traditional wired transmission, this paper proposes a wireless downhole transmission system based on optical OFDM technique. This system is advantageous in both optical

Secure Color Image Transmission in a Downlink JP-COMP Based MIMO-OFDM Wireless Communication System
free download

ABSTRACT In this paper, we made a comprehensive BER (bit error rate) performance simulative study on secure color image transmission in a joint processing-coordinated multipoint aided MIMO-OFDM (multiple input multiple output-orthogonal frequency

Scrambled Voice Frequency Signal Transmission in an Amplify and Forward Relaying Based STBC Encoded Cooperative MIMO-OFDM System.
free download

Abstract In this paper, a comprehensive study has been made on performance assessment of a single relayed cooperative wireless communication system under implementation of OFDM aided MIMO technology. This paper provides a new insight on system performance

Comparative Analysis Between Clustered-OFDM and OFDMA for the Multiuser DownlinkTransmission
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Abstract Frequency selectivity in a radio environment can severely limited the transmission rate. OFDM-based multi-carrier techniques for the data communications (xDSL, WiFi, and WiMAX), in particular OFDMA, is a good means for combating the frequency-selective

Data transmission with OFDM technique using soliton carriers
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ABSTRACT OFDM provides both high data rate and symbol duration with overlapping sub carriers without causing inter carrier interference using frequency division multiplexing (FDM) over multi sub carriers within one channel. On the other hand solitons are famous

Higher Spectral Efficiency Coherent Optical OFDM Transmission With Iterative Polar Modulation
free download

ABSTRACT Achieving high spectral efficiency in optical transmissions has recently attracted much attention, aiming to satisfy the ever increasing demand for high data rates in optical fiber communications. Therefore, strong Forward Error Correction (FEC) coding in

A Review on PAPR Reduction Techniques in MIMO OFDM Transmission
free download

ABSTRACT Wireless Communication is one of the major aspects of life. The progression in age and its growing demands, there has been rapid development in the field of communication. For better transmission system single carrier waves are being replaced by multi carrier

Reduction of Error for Load Forecasting using Fuzzy Programming and OFDM Transmission
free download

ABSTRACT Today, it is very important for developed and developing countries to consume electricity more efficiently. Though developed countries do not want to waste electricity and developing countries cannot waste electricity. This leads to the concept Load Forecasting.

Compromise between Guarg Interval and Orthogonality in OFDM Transmission
free download

ABSTRACT Transmission of higher rates on frequency selective channels is nowadays a challenge. The multicarrier modulations can made a good way to achieve the desired rates on this type of channels. Based on the simultaneous transmission of user data on a

Energy Efficient OFDM Transmission Scheme based on Continuous Phase Modulation
free download

ABSTRACT In this paper we propose an energy efficient OFDM transmission scheme. Two CPM (continuous phase modulation) schemes are introduced to OFDM, keeping in view the constant envelope and continuous phase changing nature of CPM modulation. Energy

Improvement in SNR with digital coding technique in OFDM transmission system
free download

ABSTRACT The paper describes the transmission of 32-QAM signals in an OFDM system with 128-point IFFT at transmitter and FFT at receiver. The channel over which transmission will take place is AWGN channel. Cyclic prefix for OFDM is calculated for improving bandwidth

PAPR Reduction in MIMO-OFDM Using Hadamard Transform for Image and VideoTransmission
free download

ABSTRACT Orthogonal Frequency Division Multiplexing (OFDM) is one of the most promising technologies to achieve High data rate wireless communications that demands robustness, high spectral efficiency, frequency selective fading, and low computational complexity.

Robust Image Transmission with OFDM over an AWGN Channel
free download

Multiplexing (OFDM) system with Low Density Parity Check Coding (LDPC). Trigonometric transforms are used in this scheme for improving the performance of the OFDM systems and reducing the Peak-to-Average Power Ratio (PAPR) of OFDM signal. It improves the error resilience

Image Transmission using M-QAM OFDM System over Composite Fading Channel
free download

ABSTRACT This paper is focused on the transmission of images using M-QAM OFDM system over Composite Fading channel. Recently proposed Generalized K Fading channel is very versatile channel which accurately approximates many of the commonly used channel

Implementation of 10Gbps Downstream OFDM-EPON Transmission System
free download

ABSTRACT For the increasing demand for capacity of optical transmission systems, Ethernet- PON comes out to be a most prominent and assuring solution in todays world. The deployment of Ethernet-PON provides the evolution path to ever higher bandwidths. With

Performance Analysis of OFDM Data Transmission With Respect to Novel High Speed RS Decoding With VLSI Implementation
free download

Abstract In this paper, we have analyzed the performance characteristics of OFDM data transmission with regard to a new high speed RS decoding algorithm. The various characteristics identified are mainly speed and accuracy of the transmission irrespective of

Implementation of Discrete Wavelet Transmission for Color Image Transmission in OFDM
free download

ABSTRACT Orthogonal frequency division multiplexing technique is most widely used for high speed broadcast purposes it is one of the most useful technologies for the present and future wireless communications. The data bits are encoded to multiple sub-carriers using

Implementation of Unequal Error Protection for SPIHT coded Grayscale Image Transmissionusing OFDM System
free download

ABSTRACT In this paper, the implementation of Unequal Error Protection for SPIHT coded Grayscale Image Transmission using OFDM system is proposed to address the issue of image transmission and reception over noisy AWGN channel. Set Partitioning in

A Design of FIS Based Adaptive OFDM System for Optimized Transmission of Grayscale Images
free download

ABSTRACT In this paper, we implement adaptive modulation in OFDM system using Mamdani Fuzzy Inference System (FIS) to transmit grayscale images over AWGN channel. The value of QAM modulation order (M) is decided by using a Mamdani Fuzzy Inference System that

Multi channel Transmission over the space-time-frequency Multi path Multiband-OfDMBased Ultra-Wideband MIMO Communication System
free download

ABSTRACT The emerging ultra wideband (UWB) system offers a great potential for the design of high speed short-range wireless communications. In order to satisfy the growing demand for higher data rates, one possible solution is to exploit both spatial and multi

A REVIEW ON UNEQUAL POWER ALLOCATION FOR IMAGE AND VIDEOTRANSMISSION OVER OFDM SYSTEM
free download

ABSTRACT Irregular image codes can have capacity approaching performance with an iterative BP decoder under AWGN channel with BPSK modulation. Normally in BPSK modulation, every bit within the block has the same power. In this paper, we will try to study unequal

Video Transmission Using New Adaptive Modulation and Coding Scheme in OFDM based Cognitive Radio
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ABSTRACT As Cognitive Radio (CR) used in video applications, user-comprehended video quality practiced by secondary users is an important metric to judge effectiveness of CR technologies. We propose a new adaptive modulation and coding (AMC) scheme for CR,

Enhancing Image and Video Transmission by Applying Unequal Power Allocation, over MIMOOFDM System
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ABSTRACT Introducing multiple transceiver antennas in this generation of wireless systems, actually occurrences of image and video communication are begin to be often, as very high data rates begin to be serviceable with advanced and updated data reliableness.

Power Allocation of Full-Duplex Transmission in Wireless OFDM Networks
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ABSTRACT In this paper, we consider a three-node wireless OFDM network, which consists of two half-duplex uplink and downlink terminal nodes and one full-duplex base station node. The full-duplex capability of the base station allows it to transmit to and receive from the

IMPROVED PERFORMANCE IN IMAGE TRANSMISSION WITH OFDM
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ABSTRACT Orthogonal Frequency Division Multiplexing is the high speed communication system in wireless communication. The new scheme proposed is to improve image transmission by using orthogonal frequency division multiplexing system over AWGN

A STUDY ON STEGO IMAGE TRANSMISSION THROUGH OFDM CHANNEL: A LITERATURE
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ABSTRACT Wireless communication plays important role in today's information exchange with higher data rates. Whether it is mobile communication, satellite communication and Wi-Fi communication. Therefore need of information security with data hiding is basic hygiene

An Efficient Cluster-Based OFDM Wireless Sensor Networks Data Transmission in Heterogeneous Network
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ABSTRACT Wireless Sensors Networks (WSN) are ad hoc networks comprised mainly of small sensor nodes with limited resources, and are rapidly emerging as a technology for large-scale, low-cost, automated sensing and monitoring of different environments of


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