Research on OFDM Carrier Synchronization

OFDM technology is the simultaneous transmission of signals in multiple overlapping channels. In order to correctly receive, the orthogonality of subcarriers must be ensured strictly. However, due to Doppler frequency shift and transceiver of the crystal is not exactly the same, there are certain carrier frequency deviation, which will destroy the orthogonality of the subcarrier wave. The frequency difference influence of phase also has cumulativity, accurate frequency synchronization is the precondition for the normal work of OFDM system. In the text, a typical data-assisted carrier synchronization algorithm is analyzed for the carrier synchronization problem in OFDM system. We studied the improved algorithm which is based on the average algorithm of training symbols, and the performance is compared by simulation analysis. Experiments show that the improved carrier synchronization algorithm is superior to the typical algorithm and has low complexity.