MIMO系统信道容量研究

Study of MIMO Channel Capacity

针对单用户MIMO系统信道的容量特性展开研究。首先详细推导了无衰落信道下信道容量表达式,然后重点分析了瑞利衰落信道下,接收端已知信道状态信息,发射端已知信道状态分布时的容量特性。最后分别针对瑞利衰落信道下,采用发射分集、接收分集以及BLAST传输结构的系统容量进行仿真。仿真结果表明:给定发射功率,独立的瑞利衰落信道条件下,MIMO系统容量随最小天线数目的增加而线性增加,极大地提高了系统容量。

The thesis studies the capacity of MIMO systems for single user. Firstly,it particularly educes the expression of channel capacity without fading. Then,it analyses the system capacity when channel state information is known at the receiver and channel distribution information is known at transmitter. In the end, the simulation based on different kinds of transmission method is given,such as transmit diversity, receiver diversity,and BLAST. And results show when the number of antennas is larger the capacity of MIMO system in the uncorrelated Rayleigh fading environment is linear to the minimum of antennas,if the power at transmitter is fixed,and the more capacity is increased.