On the performance of adaptive hybrid MQAM-MPPM scheme over Nakagami and log-normal dynamic visible light communication channels.
On the performance of adaptive hybrid MQAM-MPPM scheme over Nakagami and log-normal dynamic visible light communication channels.
复制标题
自适应混合 MQAM-MPPM 方案在 Nakagami 和对数正态动态可见光通信信道上的性能。
DOI：
10.1364/ao.379893
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发表时间：
2020
期刊：
影响因子：
1.9
通讯作者：
M. Aly
中科院分区：
文献类型：
--
作者：
A. El;Abdallah S. Ghazy;Haitham S. Khallaf;Ehab Mahmoud Mohamed;H. Shalaby;M. Aly
本文介绍了利用自适应混合调制技术克服可见光通信（VLC）系统信道衰落效应的思想。由于能够逐渐改变频谱效率以应对信道效应，因此考虑了一种混合的$M $M-ary正交幅度调制（$ M{\rm QAM} $MQAM）和多脉冲脉冲位置调制（MPPM）技术。首先，利用Zemax光学工作室模拟器对动态VLC通道进行仿真。Zemax的结果表明，Nakagami分布和对数正态分布对模拟结果的拟合效果最好。本文分析研究了$M {\rm QAM} $MQAM-MPPM在Nakagami信道和log-normal信道下的性能，得到了平均误码率（BER）的封闭表达式。提出了在特定信道状态和中断概率约束下评估导致最高频谱效率的混合调制技术设置的优化问题，并用穷举搜索法求解。结果表明，与普通的QAM和MPPM方案相比，自适应混合方案提高了系统的频谱效率。结果表明，与普通的QAM和MPPM方案相比，自适应混合方案提高了系统的频谱效率。具体来说，在低平均传输功率下，$ - 32\；{\rm dBm} $-32dBm时，自适应混合方案的频谱效率比自适应普通方案提高280%。在更高的功率下，$ - 20\；{\rm dBm} $-20dBm比普通QAM和普通MPPM分别提高6.5%和725%。与普通方案相比，自适应混合方案在平均误码率和中断概率方面也有很大的提高。对于$ {\rm BER}{=10 ^{-3}} $BER=10-3的Nakagami信道，$m=1,2,3时，混合方案分别提高了28%，34%和38%。同时，$ {\rm BER}{=10 ^{-3}} $BER=10-3的混合方案的停机概率比普通的$M {\rm QAM} $MQAM和MPPM方案分别提高30%和14%。
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 $M-ary quadrature-amplitude modulation ($ M{\rm QAM} $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 $ M{\rm QAM} $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\;{\rm dBm} $-32dBm, the adaptive hybrid scheme shows 280% improvement in spectral efficiency compared to adaptive versions of ordinary schemes. At higher power, $ - 20\;{\rm dBm} $-20dBm, 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 $m=1,2,3 for Nakagami channels at $ {\rm BER}{ = 10^{ - 3}} $BER=10-3. Also, the outage probability of hybrid schemes of $ {\rm BER}{ = 10^{ - 3}} $BER=10-3 shows 30% and 14% better performance than ordinary $ M{\rm QAM} $MQAM and MPPM schemes, respectively.
影响因子：
3.9
作者：
Akande, Kabiru O.;Haigh, Paul Anthony;Popoola, Wasiu O.
通讯作者：
Popoola, Wasiu O.