空时分组码是一种可在瑞利衰落信道中使用多天线传输信息的新方法。该文研究了一种在发射端已知信道状态信息条件下的四个发射天线、全分集、全速率编码方案。此方案利用了传输重量,可得到正交空时编码,且在接收端使用最大比例组合得到各输出支路的极小距离判决译码,它能取得与最大似然译码同样的性能,且译码复杂度大为降低。 Space-time block coding is a new method of transmitting information using multiple antennas in Rayleigh fading channels. In this paper, we study four transmit antennas, full-diversity and full-rate coding schemes with known channel state information at the transmitting end. This scheme uses the transmission weight to obtain orthogonal space-time coding, and uses the maximum ratio combination at the receiving end to obtain the minimum distance decision decoding of each output branch, which can achieve the same performance as the maximum likelihood decoding, and Decoding complexity is greatly reduced.