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arXiv 1503.03308cs.ITmath.IT
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室内无线可见光通信中的广义空间调制

Generalized Spatial Modulation in Indoor Wireless Visible Light Communication

S. P. Alaka, T. Lakshmi Narasimhan, A. Chockalingam

摘要:

本文研究了广义空间调制(GSM)在室内无线可见光通信(VLC)系统中的性能。GSM使用$N_t$发光二极管(LED),但在给定时间仅激活其中的$N_a$。空间调制和空间复用分别是具有$N_{a}=1$和$N_{a}=N_t$的GSM的特殊情况。本文首先推导了VLC系统中GSM系统最大似然(ML)检测的比特出错率(BER)的解析上界。分析和仿真结果表明,推导的上限是非常严格的中到高信噪比(SNR)。信道增益和信道相关性影响GSM性能,使得在最佳LED间隔处实现最佳BER。此外,对于固定的传输效率,VLC中的GSM的性能随着LED的半功率半角度的减小而提高。然后,我们在VLC系统中的GSM的性能与其他MIMO方案,如空间复用(SMP),空移键控(SSK),广义空移键控(GSSK),和空间调制(SM)进行比较。分析和仿真结果表明,VLC中的GSM在中等到高SNR下优于其他考虑的MIMO方案;例如,对于每个信道使用8比特,GSM在$10^{-4}$ BER下优于SMP和GSSK约21 dB,优于SM约10 dB。

英文摘要:

In this paper, we investigate the performance of generalized spatial modulation (GSM) in indoor wireless visible light communication (VLC) systems. GSM uses $N_t$ light emitting diodes (LED), but activates only $N_a$ of them at a given time. Spatial modulation and spatial multiplexing are special cases of GSM with $N_{a}=1$ and $N_{a}=N_t$, respectively. We first derive an analytical upper bound on the bit error rate (BER) for maximum likelihood (ML) detection of GSM in VLC systems. Analysis and simulation results show that the derived upper bound is very tight at medium to high signal-to-noise ratios (SNR). The channel gains and channel correlations influence the GSM performance such that the best BER is achieved at an optimum LED spacing. Also, for a fixed transmission efficiency, the performance of GSM in VLC improves as the half-power semi-angle of the LEDs is decreased. We then compare the performance of GSM in VLC systems with those of other MIMO schemes such as spatial multiplexing (SMP), space shift keying (SSK), generalized space shift keying (GSSK), and spatial modulation (SM). Analysis and simulation results show that GSM in VLC outperforms the other considered MIMO schemes at moderate to high SNRs; for example, for 8 bits per channel use, GSM outperforms SMP and GSSK by about 21 dB, and SM by about 10 dB at $10^{-4}$ BER.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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