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中文摘要：
本文提出一种无需信道估计的分布式MIMO差分编码及检测方法：发送端将发射符号进行相位差分调制后生成空时码矩阵进行发射，接收端利用前后接收量判断相位信息恢复出发送端数据信息．本文将该方法在不同信道传播时延场景下进行了仿真验证，仿真结果表明，在相同Eb／N0情况下，不同信道传播时延对应的误码率性能不同：在信道传播时延从0．1Ts到0．9Ts的变化过程中，误码率随信道传播时延的增大先降低后升高，当信道传播时延为0．6Ts左右误码率达到最低，存在使系统误码率性能较好的信道传播时延．
英文摘要：
This paper proposes a differential encoding and detection scheme for distributed MIMO system where channel estimation is not needed to know the channel knowledge.At the transmitter, space-time codes are constructed with symbols which are differentially modulated by phase. The phase information is detected using two consecutive received signal vectors. The proposed scheme is evaluated in different channel propagation delay cases, and the simulation results show that the bit error rate （BER） performance is nonidentical in different propagation delay cases：the BER first decreases and then increases as the channel propagation delay changes from 0.1 symbol period to 0.9 symbol period. The BER performance is better when the propagation delay is about 0. 6 symbol period, and there exists a delay case when the system achieves better performance.
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