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随着可见光通信多输入多输出(VLC-MIMO)系统收发端阵元数目增多、阵元间距减小以及传输距离增大,系统接收端信号间严重干扰、信道矩阵缺秩等问题逐渐凸显,导致系统的复用率降低、信道相关性增大。针对这些问题,提出以最小化最大干信比为优化目标;通过建立VLC-MIMO信道模型,分析收发端阵元法向量倾斜角度对信道相关性的影响;通过优化发光二极管(LED)法向量倾斜角度来减小信道相关性,并得到各个LED法向量的最佳倾斜角度。通过比较系统接收平面的光照度分布,发现所提出的优化方案能有效减小信号间干扰,与链路阻塞方式相比,该方案的误码率降低了42dB。
With the increase of the number of transmitting and receiving end-elements in VLC-MIMO systems, the decrease of array element spacing and the increase of transmission distance, the serious interference between the signals at the receiving end of the system and the lack of rank of the channel matrix gradually lead to problems System reuse rate decreases, the channel correlation increases. In order to solve these problems, aiming at the optimization of minimization of the maximum signal-to-interference ratio (SNR) is proposed. By establishing the VLC-MIMO channel model, the influence of the tilt angle of the receiver- Angle to reduce the channel correlation, and get the best tilt angle of each LED normal vector. By comparing the illuminance distribution of the receiving plane of the system, it is found that the proposed optimization scheme can effectively reduce the inter-signal interference, and the bit error rate of the scheme is reduced by 42dB compared with the link blocking mode.