用于快时变MIMO衰落信道的一种差分空时调制技术

Differential space-time modulation scheme for rapidly time-varying MIMO fading channels

针对快时变多输入多输出(MIMO)平坦衰落信道,利用时变信道的基扩展模型(BEM),提出了一种差分空时调制方案。差分编码按块进行,发射信号矩阵为对角酉矩阵。通过设计发射端的交织及接收端的解交织,判决反馈差分检测不需要信道状态信息。理论分析和仿真表明,该方案能同时实现最大的天线分集和信道时变性所提供的Doppler分集。

Capitalizing on the basis expansion model （BEM） for time-varying channels, a differential space-time modulation scheme was proposed for rapidly time-varying multiple-input multiple-output （MIMO） flat fading channels. The scheme employed block differential encoding, and transmitted signal matrices were diagonal and unitary. By judiciously designing interleaving at the transmitter and deinterleaving at the receiver, decision-feedback differential detection did not require channel state information. Theoretical analysis and simulation results demonstrated that the proposed scheme can achieve the maximum antenna diversity and Doppler diversity provided by time-varying channels.