多天线OFDM系统全速率空时编码的分析与设计

Design and Analysis of Full Diversity Full Rate Space Time Codes in Multiple Antenna OFDM Systems

多天线OFDM(Orthogonal Frequency Division Multiplexing)系统环境下,针对现有全分集全速率空时编码分集复用交换之间的关系问题,在多天线OFDM系统模型下推导了其分集和复用增益交换曲线,进一步证实了FDFR(Full Diversity Full Rate)空时编码是一种最优的分集复用交换空时编码。给出了实现全分集全速率空时编码的设计方法。理论分析表明,全分集全速率空时编码具有较好的空间链路适应性。在中国未来通用无线环境研究计划(FuTURE:Future Technologies for a Universal Radio Environment)的系统配置条件下,仿真了全分集全速率空时编码的性能并与其他现有最优空时编码的性能进行对比。结果表明,全分集全速率空时编码具有更好的链路适应性和较好的性能。

For the space time codes in the multiple antenna OFDM（Orthogonal Frequency Division Multiplexing） systems,one could obtain the tradeoff between diversity and multiplex gains as their performance metric,which is the indictor of their adaptations in wireless links.So,the tradeoff relationships of diversity and multiplex gains were deduced in the scenarios of multiple antenna OFDM system settings.The tradeoff is optimal and indicates whether the space time codes are the optimal space time design schemes.It could obtain full diversity and full rate（FDFR： Full Diversity Full Rate） gain with better spatial link adaptations.Aiming at the China FuTURE 4G system configurations,one design of the FDFR space time codes was presented.Compared with other optimal space time designs,its performance analysis and test results verified its better performance in terms of spatial link adaptations and system symbol rates.