Signal Space Diversity in Single and Multiuser Scenarios Employing Sphere Decoder Detector

Mora, Henry Ramiro Carvajal; Garzón, Nathaly Verónica Orozco; Almeida, Celso de

doi:10.1109/lcomm.2018.2797276

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…Several works have focused on enhancing the coverage and performance of wireless systems by counteracting the detrimental effects of fading. Diversity and combining techniques have been extensively studied in the literature [ 10 , 11 , 12 , 13 , 14 ]. Such techniques focus on processing various replicas of the transmitted signal, which are affected by independent fading [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

On the Performance of Decode-and-Forward Equal-Gain-Combining Relay Systems over Weibull Fading Channels

Lucero

Mora

Garzón

et al. 2023

Sensors

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Relay-assisted wireless communications, where both the relay and the final destiny employ diversity-combining techniques, represent a compelling strategy for improving the signal-to-noise ratio (SNR) for mobile terminals, mainly at millimeter-wave (mmWave) frequency bands. In this sense, this work considers a wireless network that employs a dual-hop decode-and-forward (DF) relaying protocol, in which the receivers at the relay and at the base station (BS) use an antenna array. Moreover, it is considered that the received signals are combined at reception using equal-gain-combining (EGC). Recent works have enthusiastically employed the Weibull distribution so as to emulate the small-scale fading behavior in mmWave frequencies, which also motivates its use in the present work. For this scenario, exact and asymptotic expressions for the system’s outage probability (OP) and average bit error probability (ABEP) are derived in closed form. Useful insights are gained from these expressions. More precisely, they illustrate how the system and fading parameters affect the performance of the DF-EGC system. Monte Carlo simulations corroborate the accuracy and validity of the derived expressions. Furthermore, the mean achievable rate of the considered system is also evaluated via simulations. Useful insights regarding the system performance are obtained from these numerical results.

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Section: Introductionmentioning

confidence: 99%

On the Performance of Decode-and-Forward Equal-Gain-Combining Relay Systems over Weibull Fading Channels

Lucero

Mora

Garzón

et al. 2023

Sensors

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“…Further, an advanced ordered block MMSE decoder for GSM is also presented in Chen et al, 25 eliminating ineffectual computation without compromising the performance as compared to the conventional techniques. Signals in Carvajal et al 26 are presented in the form of a matrix arrangement to implement a sphere decoder at the receiver. Al‐Nahhal and Dobre 27 have proposed a novel low complexity sphere decoder algorithm for quadrature spatial modulation (QSM) decoders for the decreased complexity of QSM‐ML.…”

Section: Introductionmentioning

confidence: 99%

Novel K best sphere decoders with higher order modulation for internet of things

Mishra

Thakur

Singh

2022

Int J Communication

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Summary Future generation communication devices, particularly the Internet of Things (IoTs) demand for low bit error rate (BER) and higher spectral efficiencies. In this context, a low complexity detection algorithm plays a vital role in determining the performance of receivers. In this paper, we have evaluated the performance of low complexity sphere decoders using K best algorithm by modifying the conventional sphere decoders into new K and K1 sphere decoders. The proposed algorithm enables the sphere decoders to use smaller values of K for better performance. Numerical simulation is performed using MATLAB to support the validity of the proposed algorithm in terms of BER and spectral efficiency at higher order modulation techniques such as 1024 quadrature amplitude modulation (QAM) and offset quadrature amplitude modulation (OQAM). Further, we have also analyzed the computational complexity of the proposed algorithm.

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“…Generally, SSD has been minimally studied in multiuser scenarios because it is necessary to employ a maximum-likelihood detector (MLD) at the receiver, which is characterized by its exponential complexity [10]. However, in [11], SSD is exploited in a single-carrier and single-cell multiuser scenario by using the sphere decoder (SD) [12] in order to decrease the MLD complexity. SD transforms the decoding process into a tree search algorithm.…”

Section: Introductionmentioning

confidence: 99%

“…SD transforms the decoding process into a tree search algorithm. In addition, in [11], an approximate expression to evaluate the BER for a single user scenario is obtained. Thus, this expression ignores the presence of interference.…”

Section: Introductionmentioning

confidence: 99%

Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

et al. 2019

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Signal space diversity (SSD) is a technique to obtain diversity without loss in spectral efficiency. Despite this, SSD has been minimally studied in multiuser scenarios. In this paper, SSD is operated in the uplink of orthogonal frequency division multiple access (OFDMA) cellular systems that exploit frequency diversity, use the optimum maximum-likelihood detector (MLD) and employ antenna arrays at the receivers. Thus, a multiuser multiple-input-multiple-output (MU-MIMO) system that works in presence of own-cell and co-cell interference (CCI) is taken into account. In order to diminish CCI, fractional frequency reuse (FFR) is used in the cellular system. For a feasible MLD implementation, a matrix structure of the received signals is obtained in order to use the sphere decoder algorithm. An exact closed-form expression to calculate the pairwise error probability between two multidimensional symbols is derived. From this, a bit error rate (BER) upper bound is found for single user scenarios. This BER expression is an accurate lower bound for high diversity orders in multiuser scenarios. The BER asymptotic analysis shows that our approach maintains the SSD multidimensional diversity, the spatial diversity of MIMO and the frequency diversity. This allows to overload the system by minimizing the BER and increasing the spectral efficiency, simultaneously. INDEX TERMSDiversity methods, MIMO, mobile communication, multiple access interference, OFDM. HENRY CARVAJAL MORA received the B.Sc. degree (Hons.) in electronics and telecommunications engineering from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2009, and the M.Sc. and Ph.D. degrees in electrical engineering from the School of Electrical and Computer Engineering (FEEC), University of Campinas (UNICAMP), Brazil, in 2014 and 2018, respectively. In 2018, he was the Director of technology transfer area with the Education, Science, Technology, and Innovation Secretariat (SENESCYT), Ecuador. He is currently a Full Professor with the Universidad de Las Américas (UDLA), Quito, Ecuador. His research interests include diversity-combining systems, multiple access systems, multiuser detection, MIMO systems, and 5G communications systems. NATHALY OROZCO G. received the Electronic and Telecommunications Engineering degree from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2011, and the M.Sc. and Ph.D. degrees in electrical engineering from the University of Campinas (UNICAMP), Brazil, in 2014 and 2018, respectively. She is currently a Full Professor with the Universidad de Las Américas (UDLA), Quito, Ecuador. Her research interests include digital communications with a specific emphasis on multiple access techniques, fading channels, MIMO, cognitive opportunistic wireless systems, and 5G technologies. PAULO CHILIGUANO T. received the B.Sc. degree in electrical engineering and telecommunications from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2009, and the M.Sc. degree in sound and music computing from the School of Electronic Engineering and Computer Sci...

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Signal Space Diversity in Single and Multiuser Scenarios Employing Sphere Decoder Detector

Cited by 7 publications

References 14 publications

On the Performance of Decode-and-Forward Equal-Gain-Combining Relay Systems over Weibull Fading Channels

On the Performance of Decode-and-Forward Equal-Gain-Combining Relay Systems over Weibull Fading Channels

Novel K best sphere decoders with higher order modulation for internet of things

Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

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