Carrier frequency offset estimation for PUCCH in high speed train environment

An iterative carrier frequency offset (CFO) estimation method is proposed for the physical uplink control channel (PUCCH) of 3GPP-LTE in high speed train environment. In the algorithm, the signal of one user in the received multi-user signals is separated by despreading, and the despreaded pilot signals of the user are employed in the cross-correlation operation to estimate the coarse CFO in frequency domain. The data signals compensated by the estimated coarse CFO, are employed to estimate the fine CFO by the cross-correlation operation. Simulation results show that the proposed scheme has high accuracy in low SNR and low complexity, and improve the performance of the system greatly.