Demodulation method for bipolar chaos shift keying communication system

Abstract

The invention relates to a demodulation method for a bipolar chaos shift keying communication system, belonging to the technical field of communication. Aiming at the problem of high bit error ratio during the coherent demodulation process when the synchronizing characteristics are not ideal in the bipolar chaos shift keying communication system, the invention adopts the technical scheme that two different chaotic signal trackers are used to respectively track the received modulated chaotic signals, and the mean square errors for the tracked signal and the received signal are calculated and compared to distinguish the transmitted data. The chaotic signal tracking method adopts two algorithms: extended Kalman filter and particle filter, and the results show that compared with the traditional coherent demodulation method, the demodulation method of the invention greatly reduces the bit error ratio when the synchronizing characteristics are not ideal; and the bit error ratio of the particle filter algorithm is superior to that of the extended Kalman filter algorithm.

Description

technical field [0001] The invention belongs to the field of communication, in particular to a demodulation method for a bipolar chaotic keying communication system. Background technique [0002] Due to the randomness and wide frequency spectrum of chaotic signals, chaotic secure communication has become one of the important research contents in the field of information security, and has good application value in civil and military applications. The chaotic keying communication method has the advantages of simple circuit structure, easy implementation, low interception rate and strong confidentiality, and is a commonly used chaotic communication scheme. The bipolar chaotic keying adopts a chaotic signal generator, and the transmitter can avoid the continuous operation of the keying, so it has higher practical value. The traditional bipolar chaotic keying communication system adopts the form of coherent demodulation, and the coherent demodulation requires the ideal chaotic s...

AI Technical Summary

Problems solved by technology

When the chaotic signals of the sending and receiving parties are ideally synchronized, the autocorrelation value of the Tent signal is 1, and the coherent demodulation method of the bipolar chaotic keying communication system has no error in the 100,000-point simulation; however, when the chaotic synchronization is not ideal, the error of the coherent demodulation high code rate

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