Robust precoded MIMO-OFDM for mobile frequency-selective wireless channels

Kalbat, Fatma; Al-Dweik, Arafat; Sharif, B.S.; Karagiannidis, George K.

doi:10.1109/wcnc.2016.7564880

Cited by 9 publications

(3 citation statements)

References 12 publications

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“…Слід зазначити, що поєднання частотного (frequency diversity) та просторового (spacial diversity) рознесення сигналів дає більший виграш порівняно з використанням будь-якого з них окремо. Перетворення Уолша-Адамара дозволяє зменшити пік-фактор у системах з OFDM [11], а спільне застосування кодера WH з часовою (WH-STBC-OFDM) та частотною (WH-SFBC-OFDM) версією схеми Аламоуті додатково дозволяє істотно підвищити завадостійкість передачі інформації [12,13].…”

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Signal-Code Constructions Based on Index Modulation Aided OFDM and Space-Time Block Coding for Frequency-Selective and Time Varying Wireless Communication Channels

Naumenko¹,

Solodovnik²

2019

Problemi Telekomunìkacìj

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New spectrally and energy-efficient signal-code construction (SCC) based on Index Modulation aided OFDM and Space-Time Block Coding, and also its noise-immune version in phase instability conditions with Inter-Channel Interference compensation operator, built intoAlamouti's coder structure, and increasing signals frequency diversity operator (Walsh-Hadamard) are proposed. In a complicated interference environment, first of all, under the influence of electronic suppression means, such methods increase simultaneously the data rate and reliability of digital information transmission. The SCCs enhance the noise immunity of the new generation wireless systems, as well as modern wireless communication networks of special purpose, which require high-quality implementation of bulky multimedia applications with high energy efficiency, in conditions of limited energy resources with spectral efficiency up to 4 bits/s/Hz. Using two transmit and no more than a pair of receive antennas guarantees the minimum weight-dimensional characteristics of mobile stations while providing the necessary level of antenna space decorrelation. The highest informational efficiency of such methods is achieved by applying reference look-up tables for short subblocks and small signal constellations, which allows the practical implementation of an optimal Maximum Likelihood Detector based on modern digital signal processors.Електронне наукове фахове виданняжурнал «Проблеми телекомунікацій»• № 1 (24) • 2019 • http://pt.nure.ua

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“…1. Побудова запропонованої схеми базується на спільному застосуванні компонентів блок-схем у [13] та [40]…”

Section: Iі виклад основного матеріалуunclassified

Signal-Code Constructions Based on Index Modulation Aided OFDM and Space-Time Block Coding for Frequency-Selective and Time Varying Wireless Communication Channels

Naumenko¹,

Solodovnik²

2019

Problemi Telekomunìkacìj

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“…Like the conventional OFDM, precoded OFDM (P-OFDM) also has several disadvantages, including sensitivity to frequency offset, symbol timing error, and IQ imbalance. Precoded-OFDM using Walsh-Hadamard transform (WHT) performance has been evaluated and proven to improve energy and spectral efficiency in wireless communication systems [11]- [13]. The performance of P-OFDM was also evaluated in powerline communication with impulse noise [14], where the P-OFDM system excels the OFDM system in the respected scenarios.…”

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Impact of carrier frequency offset and in-phase and quadrature imbalance on the performance of wireless precoded orthogonal frequency division multiplexing

Suyoto

Subekti²,

Satyawan³

et al. 2022

IJECE

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<p>Precoding in orthogonal frequency division multiplexing (OFDM) system proved to reduce the peak-to-average power ratio (PAPR), so that it improves BER. However, from the existing literature, the effect of carrier frequency offset (CFO), in-phase and quadrature (IQ) imbalance on precoded wireless OFDM systems has not been carried out. Therefore, this study evaluated the precoded OFDM (P-OFDM) system performance by considering the impact of CFO and IQ imbalance. P-OFDM performance evaluation is expressed in signal-to-interference noise ratio (SINR) and bit error rates (BER). The communication channels used are the additive white Gaussian noise (AWGN) channel and the frequency-selective Rayleigh fading (FSRF) channel, while the channel equalization process is considered perfect. The results of the analysis and simulation show that P-OFDM is greater affected by the presence of CFO and IQ imbalance than conventional OFDM system. In AWGN channel, P-OFDM experiences different SINR for each subcarrier. This is different from conventional OFDM system, where all SINRs are the same for all subcarriers. In the FSRF channel, both the POFDM system and the OFDM system experience different SINR for each subcarrier, where the SINRs fluctuation in the P-OFDM system is much larger than in the OFDM system.</p>

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