分布式MIMO-OFDM信号多频偏多信道联合盲估计  

Joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM systems

作　　者：黄艳艳[1] 彭华[1] 

机构地区：[1]信息工程大学,郑州450002

出　　处：《计算机应用》2015年第6期1531-1536,共6页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61401511)

摘　　要：针对多径衰落信道下分布式多输入多输出正交频分复用(MIMO-OFDM)系统中频偏信道联合盲估计难的问题,提出了一种有效的多频偏多信道联合盲估计方法。该算法利用盲解卷积分离算法接收信号的同时得到有频偏影响的多个信道,对分离后的多个信号进行逐个频偏估计,补偿整体信道并去除信道模糊度,得到有效的信道估计值。仿真结果表明,与基于导频的频偏信道估计方法相比,所提算法可在5 d B获得1e-6的频偏估计精度,在15 d B左右获得1e-2的信道估计精度,实现了分布式MIMO-OFDM信号的多频偏多信道联合盲估计。Joint blind estimation of multiple frequency offsets and multiple channels is difficult in distributed Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing （MIMO-OFDM） system under the multipath fading channel. In order to solve the problem, an effective algorithm was proposed. The proposed algorithm made use of blind deconvolution separation method to receive signal and got the multiple channels embedded with frequency offsets meanwhile. After estimating frequency offsets of the separated signals, the real channels estimation could be obtained by removing channel ambiguity and compensating the whole channels. The simulation results show that, the proposed algorithm is able to get le-6 average Mean Square Error （MSE） of frequency offsets estimation at 5 dB and le-2average MSE of channels estimation at 15 dB compared with existing frequency offset channel estimation method based on pilot, the joint blind estimation of multiple frequency offsets and multiple channels for distributed MIMO-OFDM signal is realized .

关 键 词：分布式多输入多输出正交频分复用 多频偏多信道 盲源分离 盲估计 模糊度 

分 类 号：TN911.7[电子电信—通信与信息系统]