In this paper, an analytical approach is presented to investigate the bit error rate (BER) performance of underwater wireless optical code division multiple access system for different water types. Optical orthogonal codes (OOC) are used as the user-specific address sequence to encode and decode the user’s data. LED with an operating wavelength of 532 nm is used as the optical source, and silicon avalanche photodiode is used as the optical detector. The system BER performance is analyzed on account of transmission distance, transmitted power, number of simultaneous users, and other system parameters where different water types (i.e., pure sea water, clear ocean water, and coastal ocean water) are considered as the communication channel qualities. It is found that the BER performance of this system significantly depends on the water types. However, the best overall system performance is achieved in pure sea water where clear ocean water provided better results than coastal ocean water.

中文翻译：

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不同水类型的水下无线CDMA系统的性能评估

本文提出了一种分析方法来研究水下无线无线码分多址系统在不同水类型下的误码率（BER）性能。光正交码（OOC）用作用户特定的地址序列，以对用户的数据进行编码和解码。工作波长为532 nm的LED被用作光源，硅雪崩光电二极管被用作光检测器。根据传输距离，传输功率，同时使用的用户数量以及将不同水类型（例如，纯海水，纯净海水和沿海海水）视为通信通道的其他系统参数来分析系统BER性能品质。发现该系统的误码率性能很大程度上取决于水的类型。然而，