Abstract:

The problem of frequency synchronization in orthogonal frequency division multiplexing with offset quadrature amplitude modulation (OFDM/OQAM) systems over time and frequency doubly-selective fading channels is considered in this paper. By approximating the doubly-selective channel with the basis expansion model (BEM), the secondorder cyclostationarity property of the received signal in the presence of carrier frequency offset (CFO) is proved. Then, a blind CFO estimation algorithm is proposed based on the cyclostationarity. Theoretical analyses and simulation results show that the proposed blind estimator can provide robust CFO estimation performance as it is immune to the effect of noise and the fading caused by the doubly-selective channel.