Fractional order multi-carrier multi-code-shift multi-system differential chaos shift keying modulation and demodulation method and modem

Abstract

The invention discloses a fractional order multi-carrier multi-code-shift multi-system differential chaos shift keying modulation and demodulation method and a modem, and relates to the technical field of communication signal processing. The modulation and demodulation method comprises the steps: carrying out the serial-parallel conversion of a to-be-transmitted multi-system information packet into P-path parallel multi-system information, carrying out the bit/symbol conversion to obtain P-path multi-system parallel constellation symbols, and meanwhile, generating a fractional order chaotic signal by a fractional order chaotic generator; generating a Walsh code by a Hadamard matrix, selecting a signal obtained by multiplying a first Walsh sequence by a fractional order chaos signal as a reference signal, multiplying other 2P different Walsh sequences by the fractional order chaos signal, inputting the multiplied signals into a multi-system DCSK modulator, respectively acquiring P paths of multi-system DCSK modulation signals through modulation, adding the reference signal and the P paths of multi-system DCSK modulation signals, after completing multi-carrier modulation, sending the information to a channel for transmission, and carrying out related demodulation at a receiving end to recover original information. According to the method, the bit error rate is lower, the higher data rate is realized, and the confidentiality is higher.

Description

technical field [0001] The invention relates to the technical field of communication signal processing, in particular to a fractional-order multi-carrier multi-code shift multi-ary system differential chaotic shift keying modulation and demodulation method and a modem. Background technique [0002] Chaotic digital modulation technology can not only retain the characteristics of low intercept probability and reduce multipath effect of traditional spread spectrum communication system, but also show unique advantages in many other aspects, such as reducing system hardware cost, improving communication security, Improve the performance of spread spectrum communication systems, etc. In recent years, chaotic digital modulation technology has become one of the hot issues concerned and researched in the field of nonlinear science and information science. [0003] Because there is no reliable and effective method to achieve chaos synchronization at the receiving end, most of the exi...

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Problems solved by technology

[0004] One of the purposes of the present invention is to provide a fractional order multi-carrier multi-code shift multi-ary system differential chaotic shift keying modulation and demodulation method to solve the problem of bit error rate, data rate and confidentiality of the existing DCSK modulation and demodulation method high problem

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