An improved frequency offset estimation algorithm for OFDM system

In Orthogonal Frequency Division Multiplexing (OFDM) system, Carrier frequency offsets (CFOs) between the transmitter and the receiver destroy the orthogonality between carriers and degrade the system performance significantly. On the basis of traditional frequency offset estimation algorithm, an improved carrier frequency offset estimation algorithm is presented in this paper, which uses one complex training sequence, can effectively estimate fractional frequency offset in the time domain and the integer frequency offset in the frequency domain. Simulation results show that the improved carrier frequency offset estimation algorithm performs better than conventional P. Moose and Schmidl algorithm, which can effectively improve the frequency estimation accuracy and provides a wide acquisition range for the carrier frequency offset with low complexity.