为提高通信可靠性, 提出一种基于预编码的STBC MIMO可见光通信方案。采用STBC的MIMO技术, 其性能不受信道相关性影响, 因此更适合于高相关性的MIMO可见光信道。在此基础上, 对STBC MIMO系统进行预编码, 以在不改变发射功率的条件下实现系统误码率的最小化; 同时, 码本的设计能大幅度降低接收端到发送端的反馈。仿真中, 以经典的Alamouti方案为例进行预编码, 在发送功率及码率相同的情况下, 与未经过预编码的Alamouti方案相比, 系统误码率性能得到大幅度提升; 与编码码率1/2的四天线STBC方案相比, 在误码率性能相当的情况下, 传输速率是其两倍。

In order to improve communication reliability, a precoding STBC MIMO visible light communication scheme is proposed . The performance of MIMO based on STBC is not affected by channel correlation, so it is more suitable for high correlation MIMO visible channel. On this basis, precoding STBC MIMO system can achieve the goal of minimizing bit error rate without changing transmission power. At the same time, the design of codebook can greatly reduce the feedback from the receiver to the transmitter. In simulation, the classical Alamouti scheme is taked as an example to precode. Compared with the uncoded Alamouti scheme, the BER performance of the system is greatly improved with the same transmission power and bit rate. Compared with the four-antenna STBC scheme with 1/2 bit rate, the transmission rate is twice as high as that of the four-antenna STBC scheme.