Joint Timing Synchronization and Sequence Detection for CPM Signals with Low Complexity

Aiming at the problem of high complexity of both timing synchronization and sequence detection for partial response continuous phase modulation, a joint timing synchronization and sequence detection algorithm with low-complexity is presented. Firstly, based on the traditional structure of decision feedback, the Laurent decomposition is used to reduce the number of matched filters and the complexity of timing error detector. Secondly, by introducing RSSD algorithm in MLSD, the complexity of trellis states is reduced. Finally, the optimization of joint timing synchronization and sequence detection is reached. Simulation results show that, for the CPM signals stipulated in DVB-RCS2, the proposed algorithm can provide better performance with much lower complexity than the traditional algorithms, which can also accurately estimate the timing parameters in the case of larger timing errors.