Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels

YUAN Guogang; CHEN Zili; GAO Xijun

doi:10.11999/JEIT220426

Volume 45 Issue 5

May 2023

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YUAN Guogang, CHEN Zili, GAO Xijun. Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426

Citation:

YUAN Guogang, CHEN Zili, GAO Xijun. Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426

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Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels

doi: 10.11999/JEIT220426

Department of UAV Engineering, Shijiazhuang Campus, Army Engineering University of PLA, Shijiazhuang 050003, China

Received Date: 2022-04-11
Rev Recd Date: 2022-08-30

Available Online: 2022-09-05

Publish Date: 2023-05-10

Abstract

Abstract

To demodulate the Weighted FRactional Fourier Transform encrypted Chaotic Direct Sequence Spread Spectrum (WFRFT-CD3S) signal over multipath fading channels, a generalized channel differential demodulation algorithm is proposed. The transmitter of the WFRFT-CD3S system modulates differentially the message bits. The receiver regards the product of the differential code and the channel as a generalized channel, and constructs a frequency-domain matched filter through the local spreading sequence to estimate the generalized channel impulse response. The receiver combines the path energies and recovers the message bits by de-differentiating the estimates of the generalized channel impulse response. The bit error rate of the proposed algorithm is analyzed theoretically, and the theoretical results are verified by numerical simulation. The numerical simulation results show that the proposed demodulation algorithm can demodulate the multipath WFRFT-CD3S signal under low signal-to-noise ratio, which ensures the anti-energy detection capability of the WFRFT-CD3S system.
- Chaotic Direct Sequence Spread Spectrum(CD3S),
- Weighted FRactional Fourier Transform(WFRFT),
- Multipath channel,
- Demodulation algorithm,
- Channel estimation

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References(19)

References

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