BER analysis of overloaded MC-CDMA cellular system employing sphere decoder in non-ideal sectorization scenario

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

doi:10.1109/wimob.2017.8115765

Cited by 2 publications

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“…3. In [41], an antenna radiation pattern expression is proposed, where the normalized antenna gain is defined for two angle intervals measured in radians. Let ϕ be the angle that a signal arrives to the antenna, such that |ϕ| ≤ π rad.…”

Section: Figurementioning

confidence: 99%

“…where a and b are the antenna gains for the angles a and b, respectively, and η is an adjustment factor for the back lobe gain. As in [41], we consider the antenna at the BS has the radiation pattern given by (5a)-(5b), with b = π/3, which is the ideal sector angle for a cell divided into 3 sectors. Fig.…”

Section: Figurementioning

confidence: 99%

“…Some proposals that emulate imperfect sectorization can be found in [38]- [42]. In particular, an expression that fits well to real antenna radiation patterns can be found in [41]. In that paper, the BER of multicarrier-code-division-multiple-access (MC-CDMA) systems employing binary-phase-shift-keying (BPSK) modulation and a multiuser maximum likelihood detector is evaluated.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, this scenario is assumed in this work to evaluate the BER and the cellular spectral efficiency in the uplink of OFDMA systems that employ M-QAM modulation. Sectorization is modeled based on our approach presented in [41], which emulates imperfect sectorization taking as reference real antenna radiation patterns. In addition, perfect power control is considered in a system where users are uniformly distributed into the cells area.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Non-Ideal Sectorized SFR Cellular Systems in Rician Fading Channels With Unbalanced Diversity

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Nowadays, low reuse factors are used in cellular systems because of high traffic demand, despite it produces high co-cell interference (CCI) levels. Consequently, soft-frequency-reuse (SFR) and sectorization are used to improve the spectral efficiency and to mitigate CCI. In addition, diversity techniques are necessary for a good system performance. Motivated by this scenario, for the uplink of orthogonal-frequency-division multiple access (OFDMA) systems, the bit error rate (BER) and the cellular spectral efficiency using multilevel-quadrature-amplitude-modulation (M-QAM) and maximalratio-combining (MRC) in Rician fading channels are analyzed, where diversity branches have different Rician K-factors (unbalanced diversity). SFR is used assuming non-ideal sectorized cells due to the irregular radiation pattern of base station antennas. An exact integral-form expression and a closed-form upper-bound to evaluate the BER are obtained. In addition, an algorithm, and an expression to calculate the cellular spectral efficiency are presented considering that a target BER must be guaranteed for all users in the cell. From the analysis, it is determined that the BER can be reduced and the spectral efficiency can be improved if some system operating parameters are selected in an adequate manner. Thus, it was noticed that the number of diversity branches, the sum of the K factors of these branches, and the antenna type, are decisive to guarantee the target BER and to maximize the cellular spectral efficiency.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Non-Ideal Sectorized SFR Cellular Systems in Rician Fading Channels With Unbalanced Diversity

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“…Chapter 4. This chapter contains our contributions based on the results published in [68,69]. The aim of this chapter is to evaluate the mean BER of MC-CDMA cellular systems employing MU-MLD.…”

Section: Contributions and Outline Of The Dissertationmentioning

confidence: 99%

Bit error rate and spectral efficiency evaluation of MC-CDMA cellular systems employing multiuser detection

Mora¹

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I would also like to thank my parents, Nancy and Jorge, because with their love, selfdenial, sacrifice and example, they help me and support me when I make mistakes, they advise me when I doubt, and when I need them, they are always by my side.I would like to express my gratitude to Prof. Dr. Celso de Almeida, for his support, patience, and encouragement throughout my graduate studies. To him I owe moments of kind dedication and guidance during the development of this work. His technical and editorial advice was essential to the completion of this dissertation and he has taught me innumerable lessons and insights on the workings of academic research and life in general.My thanks also go to the members of my dissertation committee, Prof.

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BER analysis of overloaded MC-CDMA cellular system employing sphere decoder in non-ideal sectorization scenario

Cited by 2 publications

References 23 publications

Performance Analysis of Non-Ideal Sectorized SFR Cellular Systems in Rician Fading Channels With Unbalanced Diversity

Performance Analysis of Non-Ideal Sectorized SFR Cellular Systems in Rician Fading Channels With Unbalanced Diversity

Bit error rate and spectral efficiency evaluation of MC-CDMA cellular systems employing multiuser detection

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