天线相关条件下非相干空频码的分集特性分析  

Diversity Character Analysis of Space-frequency Coding Under Antenna Correlation

作　　者：王欣[1] 蓝兴[1] 魏急波[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《信号处理》2009年第3期347-356,共10页Journal of Signal Processing

摘　　要：已有的非相干空频码设计的文献分析了在天线不相关假设下一个MIMO-OFDM系统的最大分集阶数,而在实际系统中,发送端和接收端的天线之间的相关性总是很难避免的,已经有理论分析指出这种天线相关性将最终影响系统容量,但并没有明确指出相关性对系统分集特性的影响。本文通过一种改进的信号模型将频率选择性衰落信道下系统的分析等效为平衰落信道下的分析,一种全新的形式导出了非相干空频码字的成对错误概率,并通过对码字成对错误概率的分析给出了存在天线相关情况下系统能提供的最大分集阶数以及码设计的一些特性,有利于非相干空频码的进一步研究。The existing papers have analyzed the maximum diversity order of a noncoherent space-frequency coded MIMO-OFDM system under the assumption of no spatial fading correlations. In a practical system, the spatial correlation always exists between the transmitter and receiver antennas. Theoretical analysis has confirmed that it will reduce the system capacity ,but it does not point out its impact to the diversity order of a practical system. In this paper,we provide a modified signal model, which transform the transmission in frequency selective channels into flat fading channels and present an asymptotic analysis of the performance under the assumption of correlated antennas. Based on the performance analysis, we propose some diversity character analysis of noncoherent space-frequency coding with antennas correlations.

关 键 词：非相干空频编码 MIMO—OFDM 分集增益 天线相关 

分 类 号：TP911.0[自动化与计算机技术]