Abstract:
Channel estimation is a key technology in OFDM system.The conventional LMMSE algorithm involves solving the inverse matrix of the autocorrelation matrix,the complexity of which is relatively high,and the overhead of time is very large.The algorithm of this paper firstly reduces the dimension of the autocorrelation matrix of the channel frequency response,and then perfoms eigenvalue decomposition.The algorithm avoids the inverse operation of the matrix,and the complexity of which is much lower.Simulation experiment analysis the performance of the signal-to-noise,mean-square error and bit error rate.The result shows that the algorithm can effectively reduce the complexity of the computation on the basis of guaranteeing the good performance of the system.