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针对MIMO(Multiple Input Multiple Output)室内可见光通信系统,提出基于子流选择块对角化(Block Diagonalization,BD)预编码的MIMO可见光通信系统。在已有的BD预编码MIMO可见光通信系统模型基础上,针对其功率利用率和误码率等方面不足进行改进,提出了子流选择的BD预编码系统,同时提出优化信道矩阵高相关性的方法,并通过仿真验证了在系统容量损失较小的情况下,系统能够提高用户的误码率性能。在传输速率为100 Mbps下,对如何布局固定用户位置以及理想位置下系统的信噪比性能等进行研究仿真,验证在理想位置下各个用户的信噪比在大多数情况下都能得到大于40dB的信噪比性能。
In view of MIMO (Multiple Input Multiple Output) indoor visible light communication system, a MIMO visible light communication system based on block diagonalization (BD) precoding is proposed. Based on the existing BD pre-coded MIMO visible light communication system model, this paper proposes a BD pre-coding system for sub-stream selection based on the improvement of its power utilization and bit error rate. At the same time, it proposes a new method to optimize the channel matrix with high correlation The simulation results show that the system can improve the bit error rate performance of the users under the condition of less system capacity loss. At the transmission rate of 100 Mbps, the simulation of how to lay out the fixed user position and the signal-noise ratio performance of the system under the ideal position is carried out to verify that the signal-to-noise ratio of each user in the ideal position can be greater than 40 dB in most cases SNR performance.