Quasi-Coherent Demodulation of TCM-4CPM and FPGA Implementation

Synchronization problem is one of the difficulties in CPM signal implementation. In frequency hopping system, frequency hopping will cause random phase change, which makes phase synchronization technique one of the important key techniques for CPM signal. In this paper, the quasi-coherent demodulation based on decision-directed phase synchronization is applied to TCM-4CPM signals to obtain a receiver model suitable for frequency hopping systems. Simulation results show that the scheme in this paper achieves higher performance gain with less use of band resource and reduces the impact of phase shift on performance. Finally, this paper presents the implementation and functional simulation of the proposed receiver on Alter’s FPGA chip-based platform.