无线光CDMA接入网的网络吞吐量研究

Research on Throughput of Wireless Optical Code-Division Multiple-Access in Access Network

根据无线光通信和无线接入技术的特点,给出了无线光CDMA接入网的分槽ALOHA-CDMA协议,并分析了无线光CDMA接入网的吞吐量性能。在考虑多用户干扰、背景光噪声、接收机噪声等多种干扰噪声的条件下,给出了无线光CDMA接入网的网络吞吐量数学模型,并采用光正交码OOC作为地址码,分析了基于此MAC协议的无线光CDMA接入网的网络吞吐量。数值计算结果表明,分槽ALOHA-CDMA协议可以具有较高的网络吞吐量。此外,通过减小分组长度或增大光地址码的码长,可进一步提高网络的吞吐能力。

Based on wireless optical communication characteristics and wireless access techniques, the Media Access Control （MAC） protocol in wireless optical code division multiple access network is presented and studied. In the analysis, background noise, multi-access interference, Avalanche Photo Diode （APD） noise, and thermal noise are taken into account. With Optical Orthogonal Code （OOC）, the mathematic model of network throughput is derived and evaluated according to numerical results. Simulation results indicate this MAC protocol can obtain high network throughput. Furthermore, with shorter packet length or longer code length, a better network throughput is obtained.