Abstract: The Orthogonal Frequency Division Multiplexing(OFDM) is broadly considered as an effective approach to future high-speed wireless multimedia communications. But it is very sensitive to carrier frequency offset between the transmitter and the receiver local oscillators, which causes intercarrier interference (ICI). Thus, in OFDM communication sytems, carrier frequency offset must be estimated and compensated at the receiver to minimize the effects of intercarrier interference and maintain orthogonality. In this paper, the mathematical model of OFDM systems with cyclic prefix (CP) and virtual subcarrier is derived first. We propose a new carrier frequency offset estimation algorithm using the DOA-MATRIX method. After the rough estimation, it can acquire the frequency offset with low computing complexity, and matrix including channel information simultaneously, which are favorable for offset compensation and demodulation of received signals. Numerical simulations can illustrate the performance of this algorithm.

Key words: carrier frequency offset, intercarrier interference, discrete Fourier transform, OFDM