Received Signal Frequency Collision Detection Method in Single-Channel Blind Separation of Frequency Hopping Communication

Abstract

The invention discloses a method for detecting received signal frequency collision in single channel blind separation of frequency-hopping communication. The method comprises the following steps of: firstly, obtaining a time-frequency distribution function X(t, f) of a received signal x(t), further calculating out a valid maximum CRc of the number of wave crests of a time-frequency domain time accumulation function according to the time-frequency distribution function X(t, f) of the received signal x(t), finally, judging whether the received signal x(t) generates frequency collision within each period of time according to the valid maximum CRc of the number of wave crests of the time-frequency domain time accumulation function. In a process of single channel blind separation of frequency-hopping communication, periods of time when each component signal in the received signal generates frequency quadrature and collision can be easily separated through the method, and then, single channel blind separation of frequency-hopping communication can be realized more easily, moreover, the method performs processing based on periods of time, as compared with the methods performing processing based on moment, the method has less computational work.

Description

technical field [0001] The invention belongs to the communication field, relates to a single-channel blind separation technology and a frequency hopping frequency collision detection technology, and particularly relates to a received signal frequency collision detection method in a single-channel blind separation of frequency hopping communication. Background technique [0002] The frequency hopping signal is the random beating of the modulated signal in a wide frequency range, and its frequency beating law is called the frequency hopping pattern. Since the frequency hopping signal is in a wide frequency range, it is difficult to maintain the phase coherence of the discrete frequency carriers during its transmission. The frequency hopping signal is generally modulated by the FSK method. [0003] Single-channel blind separation is the process of receiving signals on a single channel and separating each source signal from the received signal when the source signal cannot be ac...

AI Technical Summary

Problems solved by technology

Among them, the better methods are particle filter and survivor-by-survival path processing, but their computational complexity is too high to be practically used, and both methods realize single-channel blind separation from the level of coding and bits.

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