An analysis of orthogonal frequency-division multiple access

Sari, Hikmet; Levy, Y.; Karam, Georges

doi:10.1109/glocom.1997.644417

Cited by 35 publications

(20 citation statements)

References 3 publications

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“…The first proposal to use orthogonal frequencies for data transmission was made in 1966 by Chang at Bell Labs [31]. The next major step in the development of OFDM was made when Weinstein et al first proposed the use of a Fast Fourier Transform (FFT) as an efficient means to generate orthogonal subcarriers in publications in 1969 and 1971 [32] making OFDM viable for electronic communications at the time. The OFDM uses IFFT and FFT algorithms for modulation and demodulation respectively.…”

Section: Orthogonal Frequency Division Multiplexing (Ofdm)mentioning

confidence: 99%

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Performance Analysis of Optical Communication Systems using OFDM by Employing QPSK Modulation

K.¹

2015

IJRITCC

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-The high data rate along with good Quality of Service (QoS) requirements of Next Generation Network (NGN) can be fulfilled by using the optical fiber communication networks. At high data rate, dispersion will be the limiting factor which needs to be suitably compensated. Many efforts have been drawn to the development of dispersion compensating devices / techniques to recover or prevent the broadening signal pulse. The Orthogonal Frequency Division Multiplexing (OFDM) is very attractive because of its capacity to handle the dispersion causing pulse broadening at the receiver without changing the internal architecture of the system. Thus Integration of Optical Communication Systems with OFDM system appears to be the most suitable technology for the NGN. The work presented here consist of the design, simulation and performance evaluation for the dispersion compensation in optical fiber communication systems using OFDM for high data rate transmission by utilizing the capacity of the optical fiber channel efficiently. The system performance has been analyzed and compared it with the single carrier optical communication systems. Various simulation results show that systems using OFDM can give dynamically tunable compensation of the dispersion by changing the various parameters of the OFDM systems. The work presented here reveals that the use of OFDM can be used to construct cost effective, high data capacity optical communication systems with extended transmission distance by employing dispersion compensation. These systems have the ability of supporting data rate up to 40 Gbps per optical channel and are appropriate for implementation as upgraded long haul high data rate optical Communication systems.

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Section: Orthogonal Frequency Division Multiplexing (Ofdm)mentioning

confidence: 99%

“…A SMF has a potential bandwidth of nearly 50 Tbps; with optical fiber networks we can achieve link capacities of the order of thousands of Gbps [4,32]. Dispersion limits the maximum transmission rate and maximal distances at which electronic repeaters must be positioned along the optical link [1].…”

Section: B Dispersion Compensation Techniquesmentioning

confidence: 99%

Performance Analysis of Optical Communication Systems using OFDM by Employing QPSK Modulation

K.¹

2015

IJRITCC

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“…The basic idea for employing OFDM for high data rate communication was originated by Chang in 1966 at Bell Labs [31]. Subsequently in 1969 and 1970 the major advancement of OFDM was introduced by Weinstein et al [32]. They articulated the application of inverse Fourier transform and Fourier transform, as a viable scheme for the implementation of the OFDM.…”

Section: Orthogonal Frequency Division Multiplexingmentioning

confidence: 99%

Critical Analysis of Dispersion Compensated Optical Communication System

Sethi¹,

Goel²

2015

IJCA

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Next generation communication systems need to dispense higher data rate in the efficient manner with capability to customize according to the dynamic data transfer framework in an economically dominant approach. The optical fiber communication networks fulfill these requirements along with small attenuation loss and better quality of services. In the last a few years the rapid progress of the data rate transmission over the existing optical transmission networks accentuated the need of more worthwhile usage of the transmission capacity of the prevailing networks. The forthcoming optical communication systems needs to support 10 Gbps and above over the single wavelength in the optical fiber channel.The Inter-Symbol Interference (ISI) due to dispersion limits the repeater less maximum transmission data rate and maximum transmission distance for the optical fiber channel [1]. Various endeavors have been taken for the advancement of the schemes and dispersion compensation devices to mitigate the effect of the dispersion causing inter-symbol interference.The primary instrument to achieve this objective is to use an equalizer. Orthogonal Frequency Division Multiplexing (OFDM) is a very favorable scheme for the high data rate data transmission because of its ability to overcome the effect of the dispersion, tolerance to the dispersive channel, high spectrum efficiency and better flexibility of operation. For mitigating dispersion impact OFDM transmits a large number of modulated sub-carriers at the same time operating at low data rate. These cause the symbol period relatively longer than the channel impulse response, hence mitigating the impact of inter-symbol interference. OFDM is a multicarrier modulation scheme, extensively investigated and deployed in wireless as well as wire line communication. It is getting increased interest in the fiber optic research community for its robustness against dispersion causing inter-symbol interference. It utilizes the spectrum efficiently and dynamically controls the dispersion. This suggest that OFDM can be the best method for the mitigating the dispersion for the long distance high data rate optical fiber communication systems. Therefore, the integration of OFDM with the optical fiber can be the excellent scheme for providing long distance high data rate efficiently. A comparative performance analysis of the dispersion compensated optical system carried out for examining the impact of the OFDM to mitigate the dispersion at 10 Gbps and above. The systems with and without using OFDM has been configured and its performance has been investigated,various results obtained exhibited that transmission performance is entirely dependent upon a proper selection of data rate, transmission length, and modulation schemes etc. For evaluating the systems performance, constellation and bit error rate are evaluated for system with and without using OFDM and subsequently compared.The various results of the investigation depicts that for high data capacity transmission for the long distance...

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“…However, as the interference level exceeds a certain threshold, OFDM-TDMA entirely breaks down but OFDMA only loses a small percentage of its total capacity. NBI affects certain sub-carriers and only the users who are allocated those sub-carriers are affected by increasing NBI [17].…”

Section: A Advantages Of Ofdmamentioning

confidence: 99%

Narrowband Interference Suppression in Wireless OFDM Systems

Nikolova

Iliev

Ovtcharov

et al. 2009

African Journal of ICT

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Abstract-Signal distortions in communication systemsoccur between the transmitter and the receiver; these distortions normally cause bit errors at the receiver. In addition interference by other signals may add to the deterioration in performance of the communication link. In order to achieve reliable communication, the effects of the communication channel distortion and interfering signals must be reduced using different techniques. The aim of this paper is to introduce the fundamentals of Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA), to review and examine the effects of interference in a digital data communication link and to explore methods for mitigating or compensating for these effects.

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An analysis of orthogonal frequency-division multiple access

Cited by 35 publications

References 3 publications

Performance Analysis of Optical Communication Systems using OFDM by Employing QPSK Modulation

Performance Analysis of Optical Communication Systems using OFDM by Employing QPSK Modulation

Critical Analysis of Dispersion Compensated Optical Communication System

Narrowband Interference Suppression in Wireless OFDM Systems

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