Review of Space-time Coded Orthogonal Frequency Division Multiplexing Systems for Wireless Communication

Oluwafemi, Ilesanmi B.; Mneney, Stanley H.

doi:10.4103/0256-4602.123126

Cited by 15 publications

(7 citation statements)

References 83 publications

(80 reference statements)

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“…There is increasing pressure on available spectrum as a result of growing demand for spretrum occupancy for wireless applications especially in the cellular network [1][2][3][4][5]. Spectrum is a finite resource and has been fully allocated as bands for different wireless services.…”

Section: Introductionmentioning

confidence: 99%

Quantitative estimation of TV white space in Southwest Nigeria

Oluwafemi¹,

Bamisaye²,

Faluru³

2021

TELKOMNIKA

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The demand for bandwidth has increased in recent years with the advent of new technologies in the wireless systems which have resulted into spectrum crunch. Utilizing the free ultra high frequency (UHF), television (TV) channels also known as TV white space (TVWS) has been proposed as a strategy for increasing spectral efficiency. Deploying TVWS requires the knowledge of the estimate of the available TVWS. In this paper, a quantitative estimation of the available TVWS in South West, Nigeria is computed using the protection view point approach, the pollution viewpoint approach and the Federal Communication Commission (FCC) rule. Results from the estimation shows that the pollution view point approach will guarantee enough protection from the primary users and hence prevent interference from the secondary users. The findings also reveal that there are abundant TVWS in the considered states for the deployment of TVWS devices.

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Section: Introductionmentioning

confidence: 99%

Quantitative estimation of TV white space in Southwest Nigeria

Oluwafemi¹,

Bamisaye²,

Faluru³

2021

TELKOMNIKA

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“…FFT‐based OFDM uses sines and cosines as basic functions that result in the generation of high peaks after the addition of narrowband signals. Such high peaks lead to high peak‐to‐average power ratio (PAPR), which is the sole reason behind the nonlinear operation of high‐power amplifier . Therefore, to solve these problems, wavelet transform (WT)–based OFDM (WOFDM) is proposed and has been standardized in IEEE P1901 .…”

Section: Introductionmentioning

confidence: 99%

“…Such high peaks lead to high peak-to-average power ratio (PAPR), which is the sole reason behind the nonlinear operation of high-power amplifier. 7 Therefore, to solve these problems, wavelet transform (WT)-based OFDM (WOFDM) is proposed and has been standardized in IEEE P1901. 8 The incentives associated with WOFDM come in the form of better time and frequency localization, which provide enhanced protection from intercarrier interference and ISI, improved spectral efficiency due to the absence of CP, and lower out-of-band radiations.…”

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confidence: 99%

Linear precoded wavelet OFDM‐based PLC system with overlap FDE for impulse noise mitigation

Khan

Shin

2017

Int J Communication

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Summary In recent years, power lines have gained significant interest for their use in high‐speed communications because of the already deployed power distribution infrastructure. However, to achieve high data rates with reliability in power line communication (PLC), robust signal processing techniques are required to mitigate channel distortion and noise. Orthogonal frequency division multiplexing (OFDM) as a multicarrier modulation technique has been standardized for PLC; however, to further enhance the quality of communication, wavelet OFDM (WOFDM) has been proposed as a suitable choice. In this article, OFDM‐based and WOFDM‐based PLC systems are studied, and overlap frequency domain equalization (OFDE) as a robust and efficient equalization technique is presented. Moreover, to enhance the efficiency of the OFDE, linear precoding (LP) is also suggested for fast Fourier transform and wavelet transform–based filter bank transceivers over the PLC channel. Performance of the proposed LP‐based OFDM‐OFDE and LP‐based WOFDM‐OFDE systems is compared with previously proposed equalization structures in terms of bit error rate, peak‐to‐average power ratio, and computational complexity via computer simulations. Furthermore, the performance of proposed architectures is also compared with classical equalization techniques under impulse noise with different intensities. Results show that not only the proposed LP‐based WOFDM‐OFDE transceiver performs better than the previous equalization models but also the LP‐based OFDM‐OFDE at the expense of slight increment in computational complexity.

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“…MC-CDMA is basically a spread spectrum version of a OFDM based system. So a MC-CDMA system incorporates features of both OFDM and CDMA and because of its ability to co mbat frequency selective fad ing and multipath fading, M C-CDMA is preferred over OFDM [2][3][4][5][6].MC-CDMA is basic radio technology for LTE networks [7]. Nowadays it is being considered as a potential candidate for 4G mob ile systems implementation.…”

Section: Introductionmentioning

confidence: 99%

PSO-Based NBI Resistant Asynchronous MCCDMA Multiuser Detector

Kumar¹,

Kaur²

2016

IJISA

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Abstract-Nowadays with the increase of demand in mu ltimed ia co mmunicat ion, a reliable and error-free wireless communication system is the need of the hour. MC-CDMA is being investigated as a potential radio technology to provide fourth generation (4G) and fifth generation (5G) cellular mobile services. Narrowband interference (NBI) signals corrupts the subcarriers of MC-CDMA system and as a result its performance degrades. All the availab le NBI elimination methods uses some kind of filters and other circuitry prior to the demodulator (receiver) to filter out NBI. So addit ion of extra hardware to the system makes the system co mplex and slow. Moreover CDMA based systems are affected by digital NBI which gets superimposed with wideband spread spectrum signal. Multiuser detection could be an efficient technique to suppress NBI and mult iple access interference (MAI). Co mputational co mplexity of optimu m mu ltiuser detector is an impediment in the way of an efficient mu ltiuser detector. In this paper we propose a particle swarm optimization (PSO) based optimu m mu ltiuser detector to eliminate NBI. Simu lation results show that performance of proposed PSO based mult iuser detector is capable of eliminating NBI with much lesser amount of computational complexity.

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Review of Space-time Coded Orthogonal Frequency Division Multiplexing Systems for Wireless Communication

Cited by 15 publications

References 83 publications

Quantitative estimation of TV white space in Southwest Nigeria

Quantitative estimation of TV white space in Southwest Nigeria

Linear precoded wavelet OFDM‐based PLC system with overlap FDE for impulse noise mitigation

PSO-Based NBI Resistant Asynchronous MCCDMA Multiuser Detector

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