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基于同时发出三色光的多芯片LED,构建室内光无线通信系统,使用不同颜色的光作为上行和下行链路的传输载体,实现双向通信。在考虑背景光噪声、接收机噪声的条件下,给出了单用户和多用户时,对采用光正交码序列作为地址码的OCDMA上行链路的误码率并进行了仿真。仿真结果表明,单用户的误码率取决于光正交码序列的长度和权重;多用户情况下的误码率主要来自多个用户之间的相互干扰,用户数量、光正交码序列的长度、权重以及判决门限都会对误码率产生影响。
Based on the multi-chip LED which emits trichromic light at the same time, an indoor optical wireless communication system is constructed, and different colors of light are used as a transmission carrier of the uplink and the downlink to achieve bidirectional communication. Considering the background noise and the receiver noise, the error rates of OCDMA uplinks using Orthogonal Code Sequence as the address code are given and simulated when single-user and multi-user are given. The simulation results show that the BER of a single user depends on the length and weight of the Orthogonal Orthogonal Code (OWC) sequence. The BER in multiuser cases mainly comes from the mutual interference among multiple users, the number of users, The length, weight, and decision threshold all affect the bit error rate.