Blind Carrier Frequency Offset Estimation Algorithm for OFDM System Based on Rotational Invariant Propagator Method

Orthogonal Frequency Division Multiplexing (OFDM) technique, which is discovered in 90’s, has been widely applied in high-definition television signal transmission, digital video transmission, wireless local area network (WLAN) and other fields. However, for the OFDM system, high sensitivity to carrier frequency offset (CFO), which leads to severe degradation of the system performance, has been recognized as its considerable weakness. Thus, it is necessary to estimate and compensate the CFO in OFDM system to ensure the system performance. In this paper, we proposed propagator method (PM) which utilizes the Vander monde property of the direction matrix to estimate CFO. Compared to estimation signal parameter via rotational technique (ESPIRT) and multiple signal classification (MUSIC) algorithm, the proposed one can obtain similar estimation performance with a lower computational complexity. Simulation results verified the effectiveness of this algorithm.