摘要
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。
In visible light communication multiple-input multiple-output （VLC-MIMO） system, the increasing of sender and receiver elements, the decreasing of array element space, and the increasing of transmission distance cause a series problems of serious interference on receiver of the system and lack of channel matrix, and further lead to low reusing rate of the system and large channel correlation. To solve these problems, the minimizing of interference-to-signal ratio is taken as the optimization goal. The channel model of VLC-MIMO is established, and the effects of the normal vector tilting angles of sender and receiver elements on channel correlation are analyzed. The normal vector tilting angle of light-emitting diode is optimized to decrease the channel correlation, and the optimal tilting angle of the normal vector tilting angle of each LED is obtained. By comparing the illumination distribution on the receiving plane of the system, we find that the proposed scheme can effectively reduce the interference, and the bit error rate is reduced by 42 dB compared with that of the link-blocked system.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第5期50-57,共8页
Acta Optica Sinica
基金
国家863计划(2013AA013603)
国家自然科学基金(61271253)
关键词
光通信
信道解相关
法向量倾斜
迫零检测
optical communications
channel decorrelation
normal vector tilting
zero forcing detection
