MSE-optimized CP-based CFO estimation in OFDM systems over multipath channels

Abstract

Carrier frequency offset (CFO) is an important issue in the study of orthogonal frequency division multiplexing (OFDM) systems. It is well known that CFO destroys the orthogonality of the subcarriers and it significantly degrades the bit error rate (BER) performance of OFDM systems. In this paper, an algorithm based on cyclic prefix (CP) is proposed for blind CFO estimation in OFDM transmission over multipath channels. The proposed method minimizes the theoretical mean square error (MSE). A closed form formula is derived. Simulation results show that the proposed method performs very well.