Novel algorithm of channel estimation for CP-OFDM systems with pilot symbols in frequency domain

A large number of pilot symbols needed to track the changes of the channel in pilot-aided channel estimation algorithms, so that the Spectrum Efficiency (SE) is reduced and the algorithm computational load is increased. In this paper, the Parameters Model (PM) for the channel frequency response is established based on the particular structure of CP-OFDM Systems (COS). Then a novel algorithm for pilot-aided channel estimation in frequency domain is given by the approximate estimation of PM based on LS. Theoretical analysis and simulation results show that the proposed algorithm has much lower implementation complexity compared with some well-known algorithms and achieves a good performance on channel estimation even when COS gets the maximum SE.