Abstract
Continuous phase modulation (CPM) is widely used in short wave communications because of its high power efficiency and constant envelope characteristic. The modulation parameters recognition of the continuous phase modulated signals in non-cooperative communications is beneficial to restore information and impose interference. In order to overcome the disadvantage of slow convergence speed of expectation maximization (EM) algorithm for CPM parameters recognition, an improved EM algorithm is proposed to solve this problem. The improved algorithm employ Newton-Raphson (NR) iterative method to estimate the frequency offset, the channel gain is determined by the value of frequency offset, the variance of the complex additive white noise is acquired by the frequency offset and the channel gain. The simulation results show that the improved method has a faster convergence speed under the same iteration termination conditions. Moreover, the proposed algorithm has a better probability of correct recognition when the number of iterations is the same.
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