Mean Spectral Efficiency Evaluation of the Uplink of MC-CDMA Cellular Systems

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

doi:10.1007/s11277-017-4405-y

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…The cellular spectral efficiency calculation is based on the coverage area that can be provided for each modulation [43]. The pseudocode used to calculate the coverage radius for each modulation is presented in Algorithm 1, where R b denotes bit rate, which according to the Nyquist theorem is R b ≤ B s log 2 M , where B s is the subcarrier bandwidth.…”

Section: B Mean Cellular Spectral Efficiencymentioning

confidence: 99%

“…An upper-bound of the integral I, defined in (31), is obtained in this appendix. From (28), (30) and (31), I is rewritten as Kg , (43) where we have used (9) and m κ is defined in (34) The primitive of π/2 0 f 1 (x)dx can be found. Hence, in order to obtain an approximation of (41), Taylor series expansion [51, Eq.…”

Section: Appendix a Upper-bound For The Integral Imentioning

confidence: 99%

“…Finally, an approach to evaluate the spectral efficiency considering that users must present a maximum BER is presented in [43]. This proposal bases the spectral efficiency calculation on the coverage radius of each modulation used in the system can offer so that a target BER is guaranteed.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, in order to use this approach, it is first necessary to obtain expressions to evaluate the system BER. In particular, in [43], the cellular spectral efficiency of MC-CDMA systems in hard frequency reuse and Rayleigh fading channel has been evaluated without considering sectorization and diversity.…”

Section: Introductionmentioning

confidence: 99%

“…This expression proves accurate approximations to the exact BER in all the SNR regimes. • Using the derived BER expressions, the proposal of [43] is adapted for our SFR scenario. An algorithm that calculates the coverage radius for each modulation is presented and an expression that evaluates the cellular spectral efficiency is obtained.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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: B Mean Cellular Spectral Efficiencymentioning

confidence: 99%

Section: Appendix a Upper-bound For The Integral Imentioning

confidence: 99%

Section: Introductionmentioning

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

et al. 2020

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Efficient MAI Cancellation Scheme in MC-DS-CDMA Using SIC

Gnanasekar¹,

Nagarajan²

2018

Int J Parallel Prog

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BER Evaluation of Linear Detectors in Massive MIMO Systems Under Imperfect Channel Estimation Effects

et al. 2019

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New perspectives for wireless communications have brought new techniques, such as a very large number of antennas at a base station (BS) serving multiple user terminals (UTs) with a single antenna each, known as massive MIMO (M-MIMO). M-MIMO linear detectors, such as maximal-ratio combining (MRC), zero-forcing (ZF) or minimum-mean-square error (MMSE) can achieve excellent performance with low complexity due to the channel hardening property. However, imperfect channel estimation produces a penalty in the performance. An average bit error rate (BER) performance analysis over time-invariant channel is presented for M-MIMO systems under imperfect channel estimation in contrast with most of M-MIMO literature that uses the ergodic capacity approach. Closed-form expressions and bounds to evaluate the average BER are derived for MRC, ZF and MMSE detectors in a unicellular environment considering M -QAM modulation. Furthermore, an expression to evaluate the normalized signal-to-noise ratio (E b /N 0 ) penalty due to the imperfect channel estimation is presented. Montecarlo numerical simulations are used to verify the tightness of the derived equations which are a function of the number of BS antennas, number of users, coherence time interval, number of pilot symbols and the E b /N 0 of pilot and data symbols used for channel estimation and data detection.INDEX TERMS BER, imperfect channel estimation, massive MIMO, maximal-ratio combining, minimummean-square error, zero-forcing.

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Mean Spectral Efficiency Evaluation of the Uplink of MC-CDMA Cellular Systems

Cited by 4 publications

References 8 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

Efficient MAI Cancellation Scheme in MC-DS-CDMA Using SIC

BER Evaluation of Linear Detectors in Massive MIMO Systems Under Imperfect Channel Estimation Effects

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