相关无线光MIMO系统的信道容量

空间相关性是制约无线光多输入多输出(MIMO)系统性能的主要因素之一。结合OOK调制技术,建立了相关无线光MIMO系统的信道模型,推导了不同相关机制下无线光MIMO系统的平均信道容量的解析式,分析了其中断性能。采用仿真实验分析了对数正态衰落信道中,空间相关性对均匀圆阵光MIMO系统的平均信道容量和中断信道容量的影响。结果表明,空间相关性的存在使得无线光MIMO系统的平均信道容量减小,中断概率增大;同时完全相关对于系统性能的影响较部分相关而言更为严重。

Channel capacity of correlated wireless optical MIMO system

Spatial correlation is one of the main factors restricting performance of the wireless optical communication (WOC) multiple-input multiple-output (MIMO) system.The channel model of correlated WOC MIMO systems combined with OOK modulation technology is established.Then, the expressions of average channel capacity of WOC MIMO system for different correlated mechanisms are derived and the outage performance is analyzed.Finally, the impacts of spatial correlation on average channel capacity and outage channel capacity of WOC uniform circular array MIMO system in lognormal fading channel are simulated.The results show that spatial correlation deteriorates the average channel capacity of WOC MIMO system and increasing the probability of interruption.Meanwhile, the impacts of complete correlation are more serious than that of partial correlation on the performance of WOC MIMO system.