On he performance of adaptive hybrid MQAM-MPPM scheme over Nakagami and log-normal dynamic visible light communication channels

摘要

In this paper, we introduce the idea of using adaptive hybrid modulation techniques to overcome channel fading effects on visible light communication (VLC) systems. A hybrid M-ary quadrature-amplitude modulation (MQAM) and multipulse pulse-position modulation (MPPM) technique is considered due to its ability to make gradual changes in spectral efficiency to cope with channel effects. First, the Zemax optics studio simulator is used to simulate dynamic VLC channels. The results of Zemax show that Nakagami and log-normal distributions give the best fitting for simulation results. The performance of MQAM-MPPM is analytically investigated for both Nakagami and log-normal channels, where we obtain closed-form expressions for the average bit-error rate (BER). The optimization problem of evaluating the hybrid modulation technique settings that lead to the highest spectral efficiency under a specific channel status and constraint of outage probability is formulated and solved using an exhaustive search. Our results reveal that the adaptive hybrid scheme improves system spectral efficiency compared to ordinary QAM and MPPM schemes. Our results reveal that the adaptive hybrid scheme improves system spectral efficiency compared to ordinary QAM and MPPM schemes. Specifically, at low average transmitted power, -32 dBm, the adaptive hybrid scheme shows 280% improvement in spectral efficiency compared to adaptive versions of ordinary schemes. At higher power, -20 dBm, 6.5% and 725% improvement are obtained compared to ordinary QAM and ordinary MPPM, respectively. Also, the adaptive hybrid scheme shows great improvement in average BER and outage probability compared to ordinary schemes. The hybrid scheme shows 28%, 34%, and 38% improvement, respectively, for m = 1, 2, 3 for Nakagami channels at BER= 10(-3). Also, the outage probability of hybrid schemes of BER= 10(-3) shows 30% and 14% better performance than ordinary MQAM and MPPM schemes, respectively. (C) 2020 Optical Society of America

机译：在本文中，我们介绍了使用自适应混合调制技术来克服可见光通信（VLC）系统的信道衰落效应的想法。由于其能够通过频谱效率逐渐改变来应对信道效应，因此考虑了一种混合M-ARY正交幅度调制（MQAM）和多级脉冲位置调制（MPPM）技术。首先，Zemax Optics Studio Simulator用于模拟动态VLC通道。 ZEMAX的结果表明，Nakagami和Log-Normal分布给出了模拟结果的最佳拟合。对于NAKAGAMI和Log-Normal通道的分析研究了MQAM-MPPM的性能，在那里我们获得平均误码率（BER）的闭合表达式。评估在特定信道状态下导致最高频谱效率的混合调制技术设置的优化问题和使用穷举搜索，并解决了中断概率的约束。我们的结果表明，与普通QAM和MPPM方案相比，自适应混合动力车方案提高了系统谱效率。我们的结果表明，与普通QAM和MPPM方案相比，自适应混合动力车方案提高了系统谱效率。具体地，在低平均透射功率-32 dBm处，与普通方案的自适应版本相比，自适应混合体方案显示了频谱效率的提高280％。与普通QAM和普通的MPPM相比，获得-20 dBm，6.5％和725％的改进，分别获得-20 dBm，6.5％和725％。此外，与普通方案相比，自适应混合动力方案显示出平均BER和中断概率的巨大改善。杂交方案分别显示28％，34％和38％的改善，用于在Ber = 10（-3）的Nakagami通道的m = 1,2,3。此外，BER = 10（-3）的混合方案的停电概率分别显示出比普通MQAM和MPPM方案的性能更好的30％和14％。（c）2020美国光学学会

On he performance of adaptive hybrid MQAM-MPPM scheme over Nakagami and log-normal dynamic visible light communication channels

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