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多天线系统是第三代甚至未来的第四代无线移动通信中极具前途的一种技术。本文在论述了无线移动通信中分集尤其是发射分集技术必要性的基础上,详细论述将发射分集与编码相结合而产生的空时编码技术。空时码分为空时格码和空时块码,然后就其性能准则和译码准则进行论述;并讨论一种属于空时块码且不需要信道信息的酉空时码及其编译码准则。文章最后给出空时码研究的最新动态及目前需要解决的问题。
Multi-antenna system is the third generation or even the future of the fourth generation of wireless mobile communications promising technology. This paper discusses the necessity of diversity, especially transmit diversity in wireless mobile communication, and discusses in detail the space-time coding technology which combines transmit diversity with coding. Space-time codes are divided into space-time trellis codes and space-time block codes, and then discuss their performance criteria and decoding criteria; and discuss a unitary space time code and its codecs that are space-time block codes and do not require channel information Guidelines. Finally, the article gives the latest development of space-time code and the current problems to be solved.