为满足智能电网双向通信的需求,采用电力线系统作为通信方式,必须有相应的信道编码、调制方案,以抑制因实时多变的电力线信道引起的各种干扰。与单输入单输出电力线系统相比,多输入多输出电力线系统可增加通信系统传输速率,确保通信的可靠性。基于正交频分复用调制方式下将差分酉空时编码的基本思想拓展到MIMO-PLC通信系统,使得接收器端可以在不估计实际电力线信道特征的情况下,采用差分解码的思想精确恢复传输数据。%The basic idea of differential unitary space time coding is extended to the MIMO-PLC communication system based on the orthogonal frequency division multiplexing modulation mode in this paper.The receiver can recover the data of transmission accurately without estimating the actual characteristicsof power line channel.
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