Performance of rotated PSK modulation in Nakagami-m fading channels

Yılmaz, Ahmet; Kucur, Oğuz

doi:10.1016/j.dsp.2010.06.009

Cited by 11 publications

(12 citation statements)

References 14 publications

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“…Furthermore, if κ → 0 and μ = m, then (25) coincides with the PEP upper bound for Nakagami-m fading channels presented in ( [11], Eq. (13)).…”

Section: Upper Boundssupporting

confidence: 74%

“…If a Nakagami-m channel fading model is considered (i.e., κ → 0 and μ = m), the optimum θ values are confirmed by the values presented in ( [11], Table one) (for QPSK constellations), which confirms the precision of the Lower Bound B approximation.…”

Section: Evaluation Of the Optimum Rotation Angle θsupporting

confidence: 57%

“…The optimal rotation angle depends on the chosen constellation order (M), as well as on the fading severity degree [6]. In this article, this technique is referred to as modulation diversity [4,7], but it is also known as constellation rotation [8], signal space diversity [9,10] and rotation and component interleaving diversity [11].…”

Section: Introductionmentioning

confidence: 99%

“…The performance of the modulation diversity technique has been evaluated considering different scenarios, which include M-ary phase shift keying (M-PSK) and M-ary quadrature amplitude modulation (M-QAM) constellations for Rayleigh fading channels [5,7,8,12], Rician fading channels [13,14] and Nakagami-m fading channels [11,15]. However, in some specific scenarios, the tails of those fading distributions do not properly fit the experimental measured data, as discussed in [16].…”

Section: Introductionmentioning

confidence: 99%

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Performance of the modulation diversity technique for κ-μ fading channels

Lopes

Queiroz

Lopes

et al. 2013

J Wireless Com Network

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The performance of wireless communication systems can be significantly improved using the modulation diversity technique, which is based on the combination of a suitable choice of the reference angle of a signal constellation with independent interleaving of the symbol components. This technique has been evaluated considering different fading channel models, such as Rayleigh, Rice and Nakagami-m. However, in some specific scenarios, the tails of those fading distributions do not properly fit the experimental measured data, which demands the use of more general channel distributions. This article presents a performance evaluation of the modulation diversity technique for κ-μ fading channels. New expressions for the PEP (Pairwise Error Probability) are obtained using numerical integration, series representation and upper/lower bounds. The evaluation, based on Monte Carlo simulation, demonstrates that the performance gain of the modulation diversity increases as the fading becomes more severe. Communications channels exhibit some degree of time correlation, which cannot be perfectly estimated, affecting the performance of the modulation diversity system. Thus, a performance evaluation of the system, concerning the presence of temporal correlation and estimation errors in the channel is also presented in the article.

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“…Furthermore, if κ → 0 and μ = m, then (25) coincides with the PEP upper bound for Nakagami-m fading channels presented in ( [11], Eq. (13)).…”

Section: Upper Boundssupporting

confidence: 74%

Section: Evaluation Of the Optimum Rotation Angle θsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of the modulation diversity technique for κ-μ fading channels

Lopes

Queiroz

Lopes

et al. 2013

J Wireless Com Network

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“…The optimal rotation angle depends on the constellation order (M ) and fading intensity degree [3]. This technique is called modulation diversity [4], but it is also known as constellation rotation [5] and signal space diversity [6] The dynamic characteristics of the wireless communication channels imply that the optimal performance of the modulation diversity technique can only be achieved if the rotation angle is dynamically changed according to the communication channel parameters. In this context, this paper presents the design and evaluation of an adaptive modulation scheme which uses the modulation diversity technique.…”

Section: Introductionmentioning

confidence: 99%

Improving the Performance of Adaptive Modulation Systems by the Modulation Diversity Technique

Lopes¹,

Lopes²,

Alencar³

et al. 2012

Anais De XXX Simpósio Brasileiro De Telecomunicações

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This paper proposes a combination of the adaptive modulation with the modulation diversity technique, which associates a suitable constellation rotation angle θ with the independent interleaving of the symbol components. Since the optimal rotation angle depends on the chosen modulation order and fading severity degree, the constellation rotation angle is dynamically changed according to the channel parameters. A new approximate expression for the pairwise error probability (PEP) is derived to allow the dynamic evaluation of the optimal value of θ. A performance analysis considering a system with parameters similar to the UMTS/HSDPA protocol is performed. The evaluation of the proposed system has shown that significant gains, in terms of the average system bit error rate, are achieved for high signal-to-noise ratio values. Keywords-Adaptive modulation, Modulation diversity, Performance evaluation.Resumo-Este artigo propõe a combinação da modulação adaptativa com a técnica de diversidade de modulação, que associa umângulo de rotação θ adequado com o entrelaçamento independente das componentes dos símbolos. Dado que oângulo de rotaçãoótimo depende da ordem de modulação escolhida e do grau de severidade do desvanecimento, oângulo de rotação da constelaçãoé dinamicamente modificado de acordo com os parâmetros do canal. Uma nova expressão aproximada para a probabilidade de erro par-a-par (PEP -Pairwise Error Probability)é derivada para permitir a avaliação dinâmica do valoŕ otimo de θ. Uma análise de desempenho considerando um sistema com parâmetros similares aos do protocolo UMTS/HSDPAé realizada. A avaliação do sistema proposto mostrou que ganhos significativos, em termos da taxa média de erro de bit do sistema, são alcançados para altos valores de relação sinal ruído.Palavras-Chave-Modulação adaptativa, Diversidade de modulação, Avaliação de desempenho.

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