MIMO系统中空时分组编码的信道容量

在多输入多输出（MIMO）系统中，建立空时分组编码模型，在分析瑞利衰落下正交空时分组码接收信噪比的基础上，得到了正交空时分组编码信遗容量的表达式，并采用数值计算的方法对其进行分析论述，得出在接收天线数一定的情况下，增加发送天线数所能得到的信道容量的上界。同时，分析证明，在发送天线数一定时，正交空时分组编码信道容量随接收天线数的增加而增加。在接收天线数一定时，信遗容量也随着发送天线数的增加而增加，但当发送天线数增加到一定数量时容量的增加就变得不十分明显。

Channel Capacity of Space-Time Block Codes in MIMO System

The page presents the space-time coding mode in MIMO system.A formula of orthogonal space-time block coding channel capacity is put out based on analyzing of received SNR of Rayleigh fading channels.And through the value calculates,the upper boundary of channels capacity is educed with the increase of transmit antennas when receive antennas is holding on.Meanwhile,It is proved by analysis that along with the increase of receive antennas the orthogonal space-time block coding channel capacity will increase when transmit antennas hold on,and along with the increase of transmit antennas the channel capacity also increases when receive antennas hold on,but when transmit antennas increases to some degree the increase of channel capacity becomes slow.