Carrier Frequency Synchronization joint Channel Estimation for OFDM Using Block-Type Pilot

In this paper, we proposed a carrier frequency synchronization algorithm joint channel estimation for OFDM using block-type pilot. Each pilot symbol was composed of repeated short PN-sequences. By using this kind of pilot, the estimation of the carrier frequency offset (CFO) was performed into two steps, an acquisition step and a tracking step. During the acquisition step, the estimation range and precision can be adjusted. Once the parameters are properly designed, the CFO efficiently estimated was large by coarse estimation and accurate by fine estimation. Making full use of the relation between the CFO and the channel coefficient, the CFO tracking is realized based on the decision feedback algorithm. Simulation results show that this algorithm has satisfactory performance. Increasing the quantity of the pilot symbols can improve the ability of the CFO and the channel tracking but decrease the spectrum efficiency. Thereby quantity of the pilot symbols should be trade-off.