A Simplified Code-aided Carrier Synchronization Algorithm

The code-aided synchronization technology can realize the estimation of carrier synchronization parameters with low signal to noise ratio when using the soft information output during decoding. However, the computational complexity based on the Expectation Maximization (EM) algorithm is very high. It proposes a new algorithm that divides the frequency offset search interval, adopts the coarse search and the fine search together, and uses different step sizes to reduce the complexity of the algorithm in the two searches. The simulation results show that compared with the original EM algorithm, the algorithm can reduce the computational complexity of the original EM algorithm without losing performance.