Tap Selection Based Multipath Channel Equalization For UWB Systems

In this paper, tap selection based Minimum Mean Square Error (MMSE) equalization technique is discussed for ultra wideband (UWB) systems in the presence of inter symbol interference (ISI) and multiple access interference (MAI). A novel tap selection technique based on matching pursuit (MP) algorithm is proposed. Given finite training sample support, diagonal loading (DL) technique is incorporated into MP algorithm to insure the robustness of tap selection. Moreover, a fast heuristic MP based tap selection technique is developed to facilitate the tradeoff between equalization performance and computational complexity. Simulation results show that the proposed tap selection based equalizer outperforms the RAKE receiver and the conventional MMSE equalizer significantly given the same amount of training symbols