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针对频率选择性衰落信道下MIMO—OFDM的系统,基于瑞利衰落信道的模型,利用m序列的自相关性,提出了一种基于m序列做梳状导频的多输入多输出正交频分复用最小二乘算法,该算法可以避免对大矩阵求伪逆,以减少计算复杂度,从而提高了信道估计的计算性能。通过对该算法的误码率性能分析和计算复杂度分析,结果表明,相比传统经典最小二乘算法,所提出信道估计算法在中低信噪比下,有效提高了信道估计性能,适合于在实际应用中实现。
Aiming at the MIMO-OFDM system under frequency-selective fading channel, based on the Rayleigh fading channel model and utilizing the autocorrelation of m-sequence, a multi-input multi-output orthogonal frequency-division The least squares algorithm is multiplexed. This algorithm can avoid the pseudo inverse of the large matrix to reduce the computational complexity and improve the computational performance of channel estimation. The performance of the proposed algorithm through bit error rate analysis and computational complexity analysis show that compared with the traditional classical least squares algorithm, the proposed channel estimation algorithm can effectively improve the channel estimation performance at medium to low SNR, which is suitable for In practical application.