Energy-efficient constellations design and fast decoding for space-collaborative MIMO visible light communications

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• 作者：Yi-Jun Zhu ; ^{yijunzhu1976@outlook.com" class="auth_mail" title="E-mail the corresponding author} ; Wang-Feng Liang ^{787666734@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Chao Wang ^{xxgcwangchao@163.com" class="auth_mail" title="E-mail the corresponding author} ; Wen-Ya Wang ^{wwya0202@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Visible light communication (VLC) ; Multiple-input multiple-output (MIMO) ; Space-collaborative constellation ; Maximum likelihood (ML) decoding ; Bit mapping
• 刊名：Optics Communications
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：383
• 期：Complete
• 页码：260-273
• 全文大小：2195 K

文摘

In this paper, space-collaborative constellations (SCCs) for indoor multiple-input multiple-output (MIMO) visible light communication (VLC) systems are considered. Compared with traditional VLC MIMO techniques, such as repetition coding (RC), spatial modulation (SM) and spatial multiplexing (SMP), SCC achieves the minimum average optical power for a fixed minimum Euclidean distance. We have presented a unified SCC structure for 2×2 MIMO VLC systems and extended it to larger MIMO VLC systems with more transceivers. Specifically for 2×2 MIMO VLC, a fast decoding algorithm is developed with decoding complexity almost linear in terms of the square root of the cardinality of SCC, and the expressions of symbol error rate of SCC are presented. In addition, bit mappings similar to Gray mapping are proposed for SCC. Computer simulations are performed to verify the fast decoding algorithm and the performance of SCC, and the results demonstrate that the performance of SCC is better than those of RC, SM and SMP for indoor channels in general.