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Discrete Chaotic System Based Digital Communications System Design

Author: YuJiaZuo
Tutor: JiangGuoPing
School: Nanjing University of Posts and Telecommunications
Course: Information Security
Keywords: Chaos Differential Chaos Shift Keying Delay keying Chaotic phase shift keying Segment shift delay keying
CLC: TN914.3
Type: Master's thesis
Year: 2011
Downloads: 41
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Abstract


Chaos Theory communication is a hot topic in the scientific community and engineering . Chaotic signals generated by the deterministic nonlinear systems with sensitivity to initial conditions , non-periodic , continuous bandwidth power spectrum and a high degree of non - related characteristics , has been widely used in digital communication systems , particularly in the secure communication system , and has broad application prospect and research value . This paper , on the basis of the existing chaotic digital communication system , for the Differential Chaos Shift Keying ( DCSK ) and delay shift keying ( CDSK ) shortcomings , consider the autocorrelation properties of discrete chaotic signals , based on DCSK and CDSK , digital The communication system in-depth study and propose improvement program . The main research contents include the following aspects : ⒈ a brief review of the history of the development of chaos theory describes the chaotic communication research status and significance of chaotic digital communication systems . ( 2 ) Research DCSK communication system principle and bit error rate performance , the focus of an improved DCSK communication scheme - chaotic phase shift keying the ( DCPSK ) modulation method , the bit error rate formula the theory DCPSK system , in white Gaussian noise channel , the Rayleigh channel Royce channel research system bit error rate ( BER ) performance , through computer simulation , the ability to analyze the noise immunity and resistance to multipath fading . ⒊ system for DCPSK can not continuously transmitted signal , the transmission rate is low , and the shortcomings of the system error rate in CDSK proposed an improved based on CDSK and DCPSK chaos shift keying modulation scheme - above the shift related delay keying ( SSCDSK ) the program is a multi- band digital modulation schemes . Given the system modulation and demodulation principle , the use of one-dimensional Logistic map chaotic signal in white Gaussian noise channel , respectively, of the quaternary SSCDSK and the binary SSCDSK system BER simulation to verify the proposed scheme with lower the bit error rate and a higher transmission rate.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Digital communication system
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