In this paper, the design analysis and construction of the Optical Wireless Communication (OWC) system are presented based on a new spreading code sequence. This new code is called Double Length Modified Prime Code (DL-MPC), which is designed to enhance the system security and achieves better Bit Error Rate (BER) performance. Additionally, the Binary Phase Shift Keying (BPSK) coherent homodyne Optical Code Division Multiple Access (OCDMA) transceiver is utilized based on the proposed code to improve the system performance. In the coherent homodyne system, the Mach–Zehnder Interferometer (MZI) is used as a phase modulator/demodulator. As well in this study, the proposed code construction and correlation characteristics have been investigated. Moreover, the OWC channel model is illustrated and further analyzed. The analysis and evaluation of overall system BER performance and throughput have been presented considering the effect of the Multi-User Interference (MUI) as a source of noise. Finally, the results indicated that the coherent homodyne OCDMA transceiver based on the DL-MPC outperforms the same system based on the popular codes concerning the system BER performance and system throughput.

本文基于新的扩展码序列，对光无线通信（OWC）系统进行了设计分析和构造。此新代码称为“双长度修改素数代码（DL-MPC）”，该代码旨在增强系统安全性并获得更好的误码率（BER）性能。另外，基于所提出的代码，利用二进制相移键控（BPSK）相干零差光码分多址（OCDMA）收发器来提高系统性能。在相干零差系统中，马赫曾德尔干涉仪（MZI）被用作相位调制器/解调器。在这项研究中，还对提议的代码构造和相关特性进行了研究。此外，图示并进一步分析了OWC通道模型。考虑到多用户干扰（MUI）作为噪声源的影响，已经提出了对整个系统BER性能和吞吐量的分析和评估。最后，结果表明，基于有关系统BER性能和系统吞吐量的流行代码，基于DL-MPC的相干零差OCDMA收发器的性能优于同一个系统。