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在无线光通信系统中采用光码分多址(OCDMA)技术,可以充分利用其丰富带宽,提高系统性能。考虑背景光噪声、探测器噪声、多用户干扰和大气闪烁等影响因素,给出了二维无线光码分多址(2D-WOCDMA)系统模型,在该模型中采用了脉冲位置调制(PPM)和光纤布拉格光栅(FBG)编解码器。通过数值分析,详细讨论了该无线光通信系统的性能。结果表明,大气闪烁是影响二维无线光码分多址通信系统性能的重要因素,当其对数方差较大时,系统难以实现通信,需要采用诸如多用户检测、信道编码及阵列接收等技术提高系统的性能;二维无线光码分多址通信系统适合采用1550 nm波段;该通信系统还受背景光、雪崩光电二极管(APD)增益和调制消光比等因素的影响。
Optical optical code division multiple access (OCDMA) technology is used in wireless optical communication systems to make full use of its rich bandwidth and improve system performance. Considering the influence factors of background noise, detector noise, multi-user interference and atmospheric flicker, the 2D-WOCDMA system model is given. The pulse position modulation (PPM) And Fiber Bragg Grating (FBG) codecs. Through numerical analysis, the performance of the wireless optical communication system is discussed in detail. The results show that the air flicker is an important factor affecting the performance of two-dimensional wireless optical code division multiple access communication system. When the logarithmic variance is large, it is difficult for the system to realize communication. Techniques such as multi-user detection, channel coding and array receiving Improve the performance of the system; two-dimensional wireless optical code division multiple access communication system suitable for 1550 nm band; the communication system is also subject to background light, avalanche photodiode (APD) gain and modulation extinction ratio and other factors.