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大气信道中,信道衰落以及天线间距的限制导致无线光多输入多输出(MIMO)系统的各光束间存在一定的相关性,这种相关性严重影响无线光通信系统的性能.基于脉冲位置调制(PPM)建立了相关信道下无线光MIMO系统的信道模型,并采用Wilkinson方法推导出对数正态衰落时无线光MIMO系统的平均信道容量.模拟结果表明:空间相关性的存在降低了系统的平均信道容量,而且随着总能量的增大,相关性带来的容量损失也增大.在完全相关信道中,发送端相关对信道容量产生的影响比接收端相关的影响更为严重.
Atmospheric channels, the channel fading and antenna spacing limitations lead to a certain correlation between the various beams of wireless optical multiple input multiple output (MIMO) system, which seriously affect the performance of wireless optical communication systems.Based on the pulse position modulation PPM), the channel model of wireless optical MIMO system is established and the average channel capacity of wireless optical MIMO system is deduced by Wilkinson method.The simulation results show that the spatial correlation reduces the average of the system Channel capacity, and with the increase of the total energy, the capacity loss caused by the correlation also increases.In the channel of complete correlation, the effect of the correlation of the sender on the channel capacity is more serious than that of the receiver.