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Robust overlapping covert communication against partialband interference via chaotic multi-tone spread spectrum.
Shengnan Guo1, Dongmei Liu2, Yongqing Fu3
1Shandong Police College, Jinan, 250000, China.
Scientific Reports
|December 19, 2025
Summary
This study introduces a covert communication scheme using dynamic spread spectrum factors to combat interference. It enhances security by making covert signals indistinguishable from noise for eavesdroppers.
Area of Science:
- Electrical Engineering
- Information Theory
- Communications Engineering
Background:
- Partial-band interference poses a significant challenge to secure communication systems.
- Distinguishing legitimate (host) signals from covert (parasitic) signals is difficult under interference.
- Existing chaotic spread-spectrum modulation schemes may lack robustness against interference.
Purpose of the Study:
- To propose and evaluate an overlapping covert communication scheme resistant to partial-band interference.
- To enhance the reliability and security of covert transmissions.
- To investigate the trade-offs between signal power ratios and eavesdropper detection error probability.
Main Methods:
- Utilizing a chaotic multi-tone framework with dynamic spread spectrum factor adjustment.
- Employing legitimate signals as masking signals for covert transmissions.
- Establishing a signal-to-noise ratio (SNR) wall to ensure covertness for non-cooperative receivers.
- Implementing frequency-band partitioning to differentiate host and parasitic signals.
- Analyzing the relationship between masking-to-covert signal power ratio and detection error probability.
Main Results:
- The proposed scheme demonstrates theoretical robustness against partial-band interference.
- Theoretical evaluations confirm enhanced communication reliability.
- Experimental results show improved bit-error rate (BER) performance with varying masking-signal strength.
- The scheme offers superior reliability and security compared to BPSK-based chaotic spread-spectrum modulation.
Conclusions:
- The dynamic adjustment of spread spectrum factors within a chaotic multi-tone framework effectively mitigates partial-band interference in covert communications.
- The proposed scheme provides a robust SNR wall, ensuring reliable and secure covert transmissions.
- Experimental validation confirms the practical effectiveness and security advantages of the developed communication scheme.
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