无线通信领域中空时编码技术

Space-Time Coding Technique in Wireless Communication

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 systems will be the most important technology in 3rd generation, even in the future 4th generation, of mobile communications. In this paper, the Up-to-date development of Space-Time Coding technology which combines transmit diversity with coding technology is surveyed. Space-time codes consist of Space-Time Trellis Code and Space-Time Block Code, which are discussed respectively. Emphasis of discussion is paid on one kind of Space-Time Block Code, namely Unitary Space-Time Code. Using this coding technique, channel estimation is not necessary both at the transmitter and the receiver. At last, the research trend of space-time codes and some conclusions are given.