一种ELMMSE信道估计算法的简化计算方法

提出一种ELMMSE信道估计算法的简化计算方法。为简化ELMMSE信道估计算法的复杂度,首先利用信道自相关矩阵的固有特性,简化了信道自相关矩阵求解;然后利用算法中逆矩阵满足共轭对称Toeplitz特性,简化了矩阵求逆。结果表明:当OFDM子载波数为128时,提出的ELMMSE算法简化计算方法的复乘、复加次数分别减小为ELMMSE算法的5.84%和5.79%。其中,信道自相关矩阵求解的复乘、复加次数分别减少了33.14%和16.64%;矩阵求逆的复乘、复加次数均由原来的o(N3)变为o(N2)。

A Simplified Calculation Method for ELMMSE Channel Estimation Algorithm

A simplified calculation method for channel estimation is proposed based on the Equivalent Linear Minimum Mean Square Error(ELMMSE) criterion. In order to simplify the calculation complexity of ELMMSE algorithm, at first, the algorithm is simplified by using the inherent property of the channel autocorrelation matrix; then, due to the inverse matrix meeting the characteristic of Hermitian Toeplitz, the complexity of inverse matrix is simplified. Simulation results show that, compared with the contrast ELMMSE algorithms, the computing times of complex multiplication and complex addition are reduced to 5.84% and 5.79% respectively. In particular, the computing times of complex multiplication and complex addition in solving autocorrelation matrix are reduced by 33.14% and 16.64% respectively. When solving the inverse matrix, both the computing times of complex multiplication and complex addition are reduced from o(N3) to o(N2).