Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Tuzlukov, Vyacheslav

doi:10.5772/58990

Cited by 11 publications

(5 citation statements)

References 38 publications

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“…Now, we compare the BER performance of DS-CDMA downlink wireless communication system employing the GR under the use of the unified complex Hadamard transform spreading sequences with that of DS-CDMA downlink wireless communication system employing the GR under the use of the WH real sequences. To analyze the performance of spreading sequences and the diversity-combining schemes considered, we adopt a Gaussian approximation approach based on the central limit theorem [99]. The Gaussian approximation is known not only to give accurate estimations of the probability of error in the region of practical interest, but also to offer insights into the effects of various sequence and system parameters and interference sources on the performance of the GR [1][2][3].…”

Section: Gr Finger Weightsmentioning

confidence: 99%

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Contemporary Issues in Wireless Communications

Khatib¹

2014

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This book presents new techniques that improve the performance of the communication system used for transmission of digital data over time varying channels such as high frequency mobile channels. It aims to provide highlights of the current research in the field of wireless communication, and to offer a contribution to the recent advances in this field. The subjects discussed in this work are very valuable to any researcher in the communication field, not only to researchers in the wireless related areas. The six chapters cover a wide range of topics in wireless communication starting with evolutionary algorithms, the conventional and adaptive precoders design, ad hoc networks, optical communication, signal processing and interference alignments.The editor would like to thank all of the authors for their valuable contributions in the area of wireless communications hoping that the book will be of great help to the readers.

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Section: Gr Finger Weightsmentioning

confidence: 99%

“…At this point, we should compare (250) and (251). For this purpose, we use a procedure proposed in [99]. If any function ) (x f is the convex function and X is the random variable, then Jensen's inequality…”

Section: Performance Analysismentioning

confidence: 99%

Contemporary Issues in Wireless Communications

Khatib¹

2014

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“…Пространственно-временной алгоритм с решетчатым кодированием был предложен в [4]. Простая схема пространственно-временной обработки кодированных сигналов была предложена в [5] и рассматривается как один из стандартов для мобильной связи пятого поколения [6][7][8][9][10].…”

Section: Introductionunclassified

Two approaches to multiuser detection over fading channels

Tuzlukov

2021

Doklady Belorusskogo gosudarstvennogo universiteta informatiki

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In this paper, two different receiver structures to multiuser detection that are appropriate for the code-division multiple-access systems with antenna arrays in fading channels are investigated and compared. We analyze and compare the performance of the two different multiuser detection structures for uplink or downlink channels. The number of elements of receiving antenna array may be limited in the downlink channel due to the small size of receivers. We assume a synchronous system, but it can be easily extended to an asynchronous system. The first approach is based on the distributed decorrelator where the signal decorrelation is performed by each receiving antenna element independently and decorrelated outputs are combined according to the maximum ratio. The second approach is the central decorrelator where the signal decorrelation is performed once collectively on the outputs from all elements of receiving antenna array. Both decorrelators provide the same performance in the additive white Gaussian noise channels. The distributed decorrelator provides the better performance in flat fading channels. We employ the decorrelator to demonstrate our results. The results discussed in the present paper can be extended to other configurations such as the blind adaptive space-time multiuser detection.

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“…Характеристики цифровых систем связи с EGC и MRC интенсивно исследуются, и результаты исследований публикуются в открытой печати для хорошо известных моделей замираний в канале связи: рэлеевских и райсовских замираний, замираний Накагами-m, предполагая их независимость или коррелированность [1]. К сожалению, замирания Вейбулла не получили такого пристального внимания в открытой печати, несмотря на великолепную совместимость с экспериментальными измерениями параметров замираний в канале связи [2,3]. При исследовании суммирования разнесенных сигналов в условиях замираний Вейбулла в [4] были представлены результаты анализа характеристик GSC приемника при наличии независимых замираний Вейбулла в каналах связи.…”

Section: Introductionunclassified

Diversity Signal Processing Over Weibull Fading Channels

Tuzlukov

2019

Doklady Belorusskogo gosudarstvennogo universiteta informatiki

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We present a moments-based approach to the performance analysis of L-branch equal-gain combining and maximal-ratio combining receivers, operating in independent or correlated, not necessarily identically distributed, Weibull fading. For both equal-gain combining and maximal-ratio combining receivers the moments of the output signal-to-noise ratio are obtained in closed-form. An accurate approximate expression is derived for the moment-generating function of the output signal-to-noise ratio of the equal-gain combining receiver utilizing the Padé approximants theory, while a closed-form expression for the corresponding MGF of the maximal-ratio combining receiver, is obtained. Significant performance criteria, such as average output signal-to-noise ratio, amount of fading and spectral efficiency at the low power regime, are extracted in closed-forms, using the moments of the output signal-to-noise ratio for both independent and correlative fading. Moreover, using the well-known moment-generating function approach, the outage and the average symbol error probability for several coherent, non-coherent, binary, and multilevel modulation schemes, are studied. The average symbol error probability of dual-branch equal-gain combining and maximal-ratio combining receivers is also obtained when correlative fading is considered in the diversity input branches. The proposed mathematical analysis is illustrated by various numerical results and validated by computer simulations.

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Signal Processing by Generalized Receiver in DS-CDMA Wireless Communications Systems

Cited by 11 publications

References 38 publications

Contemporary Issues in Wireless Communications

Contemporary Issues in Wireless Communications

Two approaches to multiuser detection over fading channels

Diversity Signal Processing Over Weibull Fading Channels

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