Research and improvement of LTE uplink frequency offset estimation and compensation

In LTE system, there are generally two types of frequency offset: fixed frequency offset and Doppler frequency offset. In the paper, firstly, two improved methods of fixed frequency offset estimation are proposed, and then according to the frequency offset estimation, data can be compensated in inter-symbols and intra-symbols. Secondly, with the presence of two types of frequency offset in the system, a joint estimation and compensation algorithm of fixed frequency offset and Doppler frequency offset is proposed. Simulation results show that the proposed algorithms can meet the performance requirements for frequency synchronization of LTE system and reduce system block error ratio(BLER) effectively.