Rician衰落信道MIMO系统容量

Capacity of MIMO Rician Channels

为了获得Rician衰落多输入多输出(Multiple Input Multiple Output,MIMO)系统容量,建立了信道状态信息在接收端已知在发射端未知的Rician衰落MIMO系统模型,推导了等功率分配下的互信息并利用矩生成函数得到了互信息的期望,即系统容量。最后,仿真实验表明对于一个固定的信道增益,较强的视距路径分量将使散射分量减少,进而导致系统容量降低。

In order to obtain the capacity of multiple-input multiple-output （MIMO） Rician channels, this paper establishes the MIMO systems model where perfect channel state information （CSI） can be tracked at the receiver under the assumption that transmitte does not have any CSI, but derives the exact expression for the mutual information （MI） with equal-power allocation. And use the moment generating function （MGF） of MI is used to obtain the mean of MI, i.e., the capacity. Finally, the simulations results show the MIMO systems benefit fxom richly scattering environment, and for a fixed channel gain, a strong line-of-sight component decreases the channel capacity due to the lack of scattering.