Journal of Communications
In this paper, the authors propose one integer frequency offset estimation algorithm for Orthogonal Frequency Division Multiplexing (OFDM) based Digital Radio Mondiale (DRM) system. The algorithm exploits the correlation of frequency pilots to construct a novel angle vector. As the power factor of the pilots in the correlated calculation is inevitably disturbed by the multipath and noise, the angle vector only utilizes the phase factor of the pilots. The integer frequency offset can be obtained by detecting the shift of the vector norm of the pilots, because the vector norm is maximum at the position of the pilots.