浅析频率选择性信道中的微分空时编码

Discussion on Differential Space-Time Coding in Frequency-Selective Channels

本文介绍了两种空-时传输机制,通过在频率选择性衰落信道上使用两根传输天线,来得到全速率和全分集非相干性。第一种机制结合了频域的OFDM微分空-时分组编码;第二种机制采用微分反时空-时分组编码,这样可以保证在不需要当前过采样或多根接收天线的情况下保证盲信道估计。

This paper introduces two space - time transmission schemes which allow full - rate and full - diversity noncoherent communications using two transmit antennas over fading frequency - se- lective channels. The first ~cheme operates in the frequency domain where it combines differential Alamouti space -time block -coding （STBC） with OFDM. The second scheme operates in the time domain and employs differential time -reversal STBC to guarantee blind channel identifiability without the need for temporal oversampling or multiple receive antennas.