具有周期调制和循环前缀的块传输系统中MIMO信道的盲辨识
doi: 10.3724/SP.J.1146.2007.01261
Blind Identification of MIMO Channels in Block Transmission System with Periodic Modulation and Cyclic Prefix
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摘要: 在块传输系统中，可通过添加块前缀来辅助信道识别。一种针对具有循环前缀和周期调制的块传输系统的盲辨识方法，利用了信道矩阵的块循环特性来求解信道系数。该文将该算法推广到了多用户系统，并给出了算法的辨识条件。同样是基于二阶统计量的方法，新算法克服了基于子空间分解类算法对噪声，对信道阶数误估计，对信道零点位置敏感的缺点。文中仿真证明了在较低信噪比条件下，利用新算法仍可对多输入多输出信道进行较好的估计。Abstract: Block prefix is usually added in block transmission system for facilitating channel identification. With cyclic prefix, the channel matrix exhibits block circulant property which is exploited to blindly identify periodically modulated block transmission system in an existing method. In this paper, this method is extended to multi-user system and some identifiability conditions are given. Though also as a second order statistics based scheme, not like many subspace based methods, this new approach owns the advantage of not sensitive to noises, channel order mismatching or channel zero locations. Simulation examples demonstrate its good performance under low SNR.
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