Fast Channel Estimation Based On FH-OFDM Systems

FH-OFDM is a technology that combines frequency-hopping(FH) and Orthogonal Frequency Division Multiplexing (OFDM). It inherits the anti-multipath fading ability of OFDM systems and anti-interference of FH technology. It can not only effectively enhance the transmission rate and capacity of the wireless communication system but also effectively combat multi-path fading and interfere. In this dissertation, the basic theories of channel estimation, which are suitable for static, or fast varying channel, and their applications in FH-OFDM system are wildly studied. Then channel estimation methods for FH-OFDM systems are discussed in detail. Propose a low-complexity interpolation channel estimator based discrete Fourier transform with comb pilot frequency to estimate the channel, which gains high efficiency of evaluation and good capability of estimation. While pilot frequency score is bigger or equal than length of equivalent channel response of system interval sampling, Analysis and simulation results show that this algorithm can successfully achieve the fast channel estimation for FH-OFDM systems.