An Improved DCT-Based Channel Estimation Algorithm with Channel PDP Modeling

Abstract

In this paper, we focus on the improvement of denoising performance of discrete cosine transform (DCT)-based channel estimator under different channel modeling. We present an improved DCT-based channel estimation algorithm for orthogonal frequency-division multiplexing mobile communication systems. This algorithm is based on a simplified denoise filter in DCT domain which is derived by traditional LMMSE filter, but has low computational complexity. In the algorithm, we employ different channel power delay profile (PDP) model to calculate coefficients of the denoise filter and propose a method to obtain coefficients without complicated calculations. Simulation results show that the use of improved DCT-based channel estimation algorithm can effectively reduce the noise in DCT domain, and consequently, improve the channel estimation performance.