In order to solve the modulation identification problem when illegal or interfering signals are detected in normal communication, a modulation identification algorithm for co-channel interfering signals is proposed. The influence of unknown parameters such as phase deviation and frequency deviation on the fourth-order cumulant of co-channel signals is analyzed and methods to reduce these influences are given. The modulation mode of the interfering signal is identified using the fourth-order cumulant of the signal as the identification feature. At the same time, the estimation of the interfering signal parameters such as phase deviation and frequency deviation is given. Experimental results show the effectiveness of the proposed algorithm.
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