Frequency offset estimation algorithm of OFDM system
OFDM系统的频偏估计算法

Carrier frequency offset will destroy the orthogonality among every subcarrier of orthogonal frequency division multiplexing (OFDM) system, and bring interchannel interference (ICI) and intersymbol interference (ISI). Combining with the frame structure of China mobile multimedia broadcasting CMMB1], this essay introduces an integer frequency offset (IFO) acquiring algorithm using conjugate multiplication between adjacent symbols. At last, a least-squares approximation algorithm is introduced to acquire the sampling frequency offset and the residual frequency offset. The computer simulation proves that least-squares approximation can get precise results.