A New Algorithm for Channel Estimation Based on Pilot-Aided and EM in Software Radio OFDM System

Abstract

In order to increase the transmission efficiency of OFDM system, considering the special structure of Software Radio OFDM system, this paper proposes gradient  acceleration method of EM algorithm(¿-EM) for OFDM systems channel estimation with Pilot assisted symbol modulation expectation. The simulation result shows that the new method can reduce the complexity and iteration times, and it has also still lower BER compared to traditional method.