一种新的基于导频的MIMO-OFDM信道估计方法

A Novel MIMO-OFDM Channel Estimation Method Based on Pilot-aided

多输入多输出正交频分复用(MIMO-OFDM)技术可以大幅度地提高无线通信系统的信道容量与传输速率,其信道估计精度对系统性能有着直接的影响。针对时域最小二乘(LS)信道估计复杂度大的问题,分析了一种基于变换域的MIMO-OFDM信道估计算法,并且提出了一种新的信道插值算法。仿真结果表明:提出的方法在误码率性能上优于最小二乘(LS)算法,接近理想信道估计性能,并且该算法计算复杂度低,易于在实际系统中实现。

Multiple input multiple output-orthogonal frequency division multiplexing （MIMO-OFDM） technology can effective enhance the transmission rate and the capacity of the wireless communication system. And the accuracy of channel estimation will influence the performance of MIMO-OFDM systems directly. Time domain least squares （IS） channel estimation has the problem of high calculation complexity. A transforming domain channel estimation algorithm for MIMO-OFDM system was analyzed. Moreover,a novel interpolation algorithm is presented. Simulation results show that the bit error rate （BER） performance of the proposed method is better than that of least squares （LS） method,and nearly optimal performance. The calculation complexity of the proposed method is reduced and it is easy to be realized in practical system.