Ofdm Channel Estimation And Equalization

Due to a variety of advantages, such as high bandwidth efficiency and excellent anti ?multipath performance, Orthogonal Frequency Division Multiplexing (OFDM) has received considerable attentions and been widely used in many fields.This paper deals with the technologies of channel estimation and equalization for OFDM system. The principle and characteristics of OFDM system are introduced first. Then several key technologies of channel estimation and equalization for OFDM are discussed in detail, including Pilot signal based channel estimation methods, cyclic prefix based channel estimation method, frequency domain adaptive filtering method and time domain equalization method for long channel impulse. The corresponding comparison and simulations are also provided. Based on the above investigation an improved cyclic prefix based channel equalization algorithm is proposed. Simulation results show it's feasible.