A PPM-based soft demodulation system and method for wireless optical communication based on single-photon counting

By using a PPM soft demodulation method based on single-photon counting to calculate the posterior probability using pulse count values ​​instead of likelihood ratios, the problems of high bit error rate and high computational complexity in underwater wireless optical communication are solved, thereby improving the robustness and demodulation efficiency of the system.

CN116722928BActive Publication Date: 2026-03-10GUILIN UNIV OF ELECTRONIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-31
Publication Date
2026-03-10

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Abstract

This invention discloses a PPM (Photon Detection and Modulation) soft demodulation system and method for wireless optical communication based on single-photon counting. The method comprises two parts: a transmitting end process and a receiving end process. The transmitting end includes encoding, modulating, and framing the data before transmitting the data stream via a laser. The receiving end includes: first, acquiring and counting the discrete electrical pulse sequence output by the single-photon detector to synchronize the data; then, obtaining the pulse count value within the PPM symbol time slot according to the synchronization clock, and using the pulse count value to replace the probability likelihood ratio of the corresponding time slot; finally, searching for the maximum pulse count value within the PPM symbol time slot to determine the position of the pulse time slot in the symbol, thereby completing data demodulation. This invention enables the communication system to accurately demodulate signals under different received optical powers, improving the overall robustness of the underwater single-photon communication system under different received optical powers.
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Citation Information

Patent Citations

  • Adaptive pulse position modulation signal demodulation method

    CN102255632A

  • Synchronization method of single-photon communication suitable for M-order PPM modulation

    CN107864031A