Real-Time and High-Speed Underwater Photon-Counting Communication Based on SPAD and PPM Symbol Synchronization
| Autor: | Jun Huang, Jianyu Wang, Liang Zhang, Rong Shu, Changkun Li, Jiansheng Dai |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Avalanche diode
Frame synchronization (video) Computer science Matched filter QC350-467 Optics. Light Atomic and Molecular Physics and Optics Photon counting Synchronization TA1501-1820 single photon avalanche diode Underwater optical wireless communication Bit error rate Electronic engineering slot synchronization Applied optics. Photonics Electrical and Electronic Engineering pulse-position modulation Sensitivity (electronics) Communication channel |
| Zdroj: | IEEE Photonics Journal, Vol 13, Iss 5, Pp 1-9 (2021) |
| ISSN: | 1943-0647 |
| DOI: | 10.1109/jphot.2021.3113659 |
| Popis: | Photon-counting detectors can increase the range of underwater optical wireless communication (UWOC) by enhancing the detection sensitivity and have thus become an active research area in recent years. However, system performance still needs to be improved in the reported underwater photon-counting communication (UPCC) experiments. In this study, a real-time, high-speed UPCC system was designed and experimentally validated based on a single-photon avalanche diode (SPAD). A reliable symbol synchronization method based on pulse-position modulation (PPM) was developed. This method achieved slot synchronization by using a narrow-pulse-width laser and a simple matched filter and realizes frame synchronization through an improved synchronization sequence. In addition, channel errors were corrected by serially concatenated convolutionally coded PPM (SCPPM), and digital signals were processed in real time based on field-programmable gate arrays (FPGAs). Finally, desktop communication experiments were completed at a slot frequency of 25 MHz and a communication rate of 6.21 Mbps. The system exhibited a bit error rate (BER) of less than 10–7, a received optical power of only −84.3 dBm, and an efficiency of 1.35 photons per bit. |
| Databáze: | OpenAIRE |
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