An efficient MIMO–OFDM VLC system of combining space time block coding with orthogonal circulant matrix transform precoding
An efficient MIMO–OFDM VLC system of combining space time block coding with orthogonal circulant matrix transform precoding
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DOI：
10.1016/j.optcom.2020.125993
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发表时间：
2020-10
影响因子：
2.4
通讯作者：
Mengru Chen;Huimin Lu;Danyang Chen;Jianli Jin;Jianping Wang
中科院分区：
文献类型：
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作者：
Mengru Chen;Huimin Lu;Danyang Chen;Jianli Jin;Jianping Wang
为了提高多输入多输出正交频分复用（MIMO-OFDM）可见光通信（VLC）系统的性能，提出了一种结合空时分组码（STBC）和正交循环矩阵变换（OCT）的高效预编码方案。设计并搭建了2× 2 MIMO-OFDM VLC实验系统，对STBC-OCT预编码方案进行了性能评估，并对不同采样率、幅值和正交调幅（QAM）阶数下的误码率（BER）性能进行了实验研究。实验结果表明，采用STBC-OCT预编码的系统比采用其他预编码方法的系统具有更好的误码率，在0.5 m距离的MIMO VLC系统中可以实现157.5 Mbit/s的传输速率。这是因为所提出的方案可以有效地缓解VLC系统的带宽限制问题，并提供最佳的可靠性。
An efficient precoding scheme combining space-time block code (STBC) and orthogonal circulant matrix transform (OCT) is proposed to improve the performance of multiple input–multiple output-orthogonal frequency division multiplexing (MIMO–OFDM) based visible light communication (VLC) systems in this work. An experimental 2× 2 MIMO–OFDM VLC system is designed and setup to evaluate the performance of the proposed STBC–OCT precoding scheme, which bit error rate (BER) performance is investigated experimentally for different sample rates, amplitudes and quadrature amplitude modulation (QAM) order. It is shown that the system using proposed STBC–OCT precoding has more excellent BER performance compared with the system using other precoding methods, and 157.5 Mbit/s transmission rate can be realized for the MIMO VLC system with 0.5 m distance. This is because that the proposed scheme can effectively alleviate the bandwidth limitation issue of the VLC system and offers the optimal reliability.