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| A Novel MU-FM-DCSK Secure Communication System |
| ZHANG Gang,LI Zejin,ZHANG Tianqi
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| (Chongqing Key Laboratory of Signal and Information Processing,
Chongqing University of Posts and Telecommunications, Chongqing 400065, China) |
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Abstract Abstract： In view of the defects of low data rate and low security in differential chaos shift keying (DCSK), a novel multiple userfrequency modulation differential chaos shift keying (MUFMDCSK) secure communication system was proposed. In the new scheme, the information of different users was multiplied by different adjusting parameters and was modulated by the frequency modulated chaotic signal. The receiver used the correlation demodulation through which the information could be restored by detecting the different output of the correlator. Therefore, the security of the system was significantly enhanced, and the data rate was greatly raised. The analysis and simulation results show that the BER in the proposed scheme is significantly superior to that of the existing multiuser chaos shift keying communication system, especially as the SNR increases above a certain threshold.
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Received: 27 April 2015
Published: 28 May 2016
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