Abstract
In underwater wireless optical communications (UWOC), low signal-to-noise ratio (SNR) and baseline drift problems caused by the attenuation of seawater channels and limited bandwidth of the transceiver system deteriorate the quality of the received signal and result in a higher bit error rate (BER). The transmission characteristics of underwater optical communication systems are analyzed, and a scheme combining length-limited coding and improved energy detection is proposed to improve the detection performance under low SNR and baseline drift. Experiments show that the scheme can improve the performance of the intensity-modulated direct-detection nonreturn-to-zero UWOC system. The BER performance of 3 × 10 − 4 can be achieved at SNR = 5.14 dB, which lays the foundation for long-distance UWOC.
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