Modulation Index Estimation of CPM Signals Based on First-Order Cyclic Moments
Hongyue Dong, Xiaolin Zhang · 2022
Continuous Phase Modulation (CPM) has been widely used in satellite communication and mobile communication systems due to its good constant envelope characteristics and high bandwidth and power utilization. CPM signals can be divided into Single-h CPM signals and Multi-h CPM signals according to the amount of modulation indexes. For CPM signals, the modulation index is the most important modulation parameter, which can affect the change of signal phase information, and its size can not only affect the speed of signal phase change, but also affect the spectral efficiency of the signal. In addition, in order to realize the practical application of CPM demodulation, correct estimation of the modulation index is a very important prerequisite.Therefore, this paper proposes a modulation index estimation based on the first-order cyclic moment, which has good universality.