Integer Frequency Offset Algorithm for Digital Radio Mondiale System

This paper proposes 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. The performance of the proposed algorithm is compared with that of conventional algorithms. The simulation results show that the proposed algorithm can effectively combat multipath and noise with wider range and higher accuracy of the frequency offset estimation. 