MIMO-OFDM系统信号检测和信道估计算法  

Signal detection and channel estimation methods for MIMO-OFDM systems

作　　者：周健[1] 曹雪虹[1] 酆广增[2] 

机构地区：[1]南京邮电大学信号处理与传输研究院,江苏南京210003 [2]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《合肥工业大学学报（自然科学版）》2007年第9期1079-1082,1086,共5页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(60472104);江苏省自然科学基金基础研究项目(bk2007237);江苏省高校自然科学研究基金资助项目(05KJB510090);南京邮电大学基金资助项目(098NY007)

摘　　要：文章针对MIMO-OFDM系统提出了一种局域化的最大似然信号检测算法,通过调整每个发送天线信号集中的搜索点邻域大小,在计算复杂度与系统性能之间折衷。仿真结果表明,该信号检测算法显著降低了计算复杂度;同时提出了一种基于导频训练序列的信道估计算法,采用该算法得到的信道估计均方误差结果接近理论极限值,系统误码率非常接近已知信道频响情况的性能。This paper proposes a local maximum likelihood detection method for MIMO-OFDM systems. The method performs the tradeoff between computational complexity and system performance by adjusting the neighborhood size, and the valid search points in each transmit antenna signal constellation are selected. Simulation results show that the proposed detection technique can reduce the computational complexity greatly. Meanwhile an efficient and straightforward channel estimation algorithm based on the pilot training sequence is presented. Simulation results indicate that the mean square error（MSE） of the channel estimation by the proposed scheme is close to the thepretical bound, and that the bit error rate（BER） performance of the system is very close to that in the case with known channel response.

关 键 词：信号检测 信道估计 多输入多输出 正交频分复用 最大似然检测 

分 类 号：TN911.7[电子电信—通信与信息系统]