Channel estimation method based on wavelet packet for MIMO-OFDM system

The Least Squares (LS) channel estimation algorithm based on pilot-assisted was investigated for Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems,aiming to overcome the shortcoming of LS algorithm being sensitive to the noise. The authors proposed a channel estimation method based on wavelet packet de-noising,which is interpolating after de-noising to the channel impulse response of the pilot symbols. Finally,according to the idea of this method,simulations and analysis were carried out based on the Long Term Evolution (LTE) protocol. The results prove that the proposed method has better performance than the traditional LS estimation algorithm:it can reduce the influence of channel noise effectively and improve the accuracy of channel estimation.