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A noise reduction orthogonal multi-user CDSK communication system based on frequency domain processing

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Abstract

In this paper, a noise reduction orthogonal multi-user correlated delay shift keying (NR-OMU-CDSK) noncoherent communication system based on frequency domain processing is proposed. In NR-OMU-CDSK, chaotic signal generated in frequency domain is converted to time domain through inverse Fourier transform, and then the real and imaginary components of the time domain signal are simultaneously modulated to two phase-orthogonal branches. The transmission rate and security performance of each branch are further improved by switches and Walsh code. In the receiver, moving average filter is used to reduce the variance of interference term in the decision variable, and information bits are obtained through relevant demodulation. The bit error rate (BER) performance of NR-OMU-CDSK is evaluated in AWGN channel and multipath Rayleigh fading channel. The research results show that the theoretical BER is basically consistent with the simulation results. The transmission rate of NR-OMU-CDSK is improved by 4N×100% (N is the number of users), and the signal-to-noise ratio is improved by nearly 4dB for the same BER performance, when NR-OMU-CDSK is compared with conventional CDSK in AWGN channel. Moreover, compared to other multi-user systems, this system has also obvious advantages in various system performance and avoids RF delay line problems.

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Acknowledgements

The valuable comments and suggestions from anonymous reviewers are sincerely appreciated which helps to improve our study in the future.

Funding

This work was supported by the National Natural Science Foundation of China (No. 61771085) and the Research Project of Chongqing Educational Commission (KJ1600407, KJQN201900601).

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Authors and Affiliations

  1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Gang Zhang, Jiangtao Dong & Lifang He

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  1. Gang Zhang
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  2. Jiangtao Dong
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  3. Lifang He
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Correspondence to Jiangtao Dong.

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Zhang, G., Dong, J. & He, L. A noise reduction orthogonal multi-user CDSK communication system based on frequency domain processing. Ann. Telecommun. 77, 237–250 (2022). https://doi.org/10.1007/s12243-021-00873-9

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