DEVICE AND METHOD FOR ESTIMATING TIME OFFSET IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) SYSTEM

摘要

The present invention discloses a method for estimating time offset in an OFDM system comprising obtaining a pilot bit frequency domain channel estimation value of a target user; transforming the obtained pilot bit frequency domain channel estimation value to time domain through inverse Fourier transform; performing multi-user separation on time domain pilot channel estimation by calculating a length of an effective channel impulse response window of the target user, and performing time domain noise reduction on each antenna for each user; searching for a peak in the effective channel impulse response window for each target user separately to determine a position of the peak; and calculating a time offset estimation value of the user based on the position of the peak. The present invention can improve accuracy of time offset estimation and increase the scope of time offset estimation, thereby improving accuracy of uplink synchronization of a terminal.