空时分组编码信道与多天线系统信道容量比较

在研究瑞利衰落条件下正交空时分组编码信道容量的基础上，将其与多发送多接收天线系统的信道容量进行了比较。比较结果表明，正交空时分组码虽然编码简单，易于实现，但在信容量方面存在较大的损失，损失的程度与编码码率、信道矩阵的秩及收发天线数等因素有关。进一步研究表明只有当编码码率和信道矩阵的秩都为1时，才没有信道容量的损失。

Comparison of Channel Capacity Between Orthogonal Space-Time Block Coding and Multi-Antenna Array System over Rayleigh Fading Channel

By comparing the channel capacities hetwem orthogonal space time block coding and multi antenna array system over Rayleigh fading channel, some capacity loss for orthogonal space time block coding is obtained, which is a function of the code rate, the rank of channel matrix and the number of transmitter and receive antennas, although the system of orthogonal space time block codes is simple and easy to implemented.If is also shown that there is no capacity loss only if both the code rate and the channel matrix rank are all one.