新的MIMO-OFDM系统盲频偏估计算法

Blind carrier frequency offset estimator for MIMO-OFDM systems

针对瑞利衰落信道,提出了一种新的基于加权循环前缀(CP,cyclic prefix)的MIMO-OFDM系统频偏估计算法及其简化实用算法。根据最大比合并原理,降低了MIMO-OFDM系统符号间干扰和高斯白噪声对频偏估计性能的影响。然后,利用无线信道统计信息,得到其简化算法。仿真结果表明,此算法在瑞利衰落信道中可以取得良好的频偏估计性能并优于其他同类算法。

A new algorithm was proposed for carrier offset estimation in orthogonal frequency division multiplexing （OFDM） over multi-input multi-output （MIMO） Rayleigh fading channels. By weighting cyclic prefix（CP） according to the maximal ratio combining （MRC） method, the new algorithm minimized the influence of the intersymbol interference （ISI） and the AWGN to synchronization. A practicable and low complexity weighting method was also presented by using the statistical information of channels. The simulation results demonstrate that the performance of the proposed algorithm is perfect in the Rayleigh channel and superior to other algorithms using CP.