为进一步提高无线紫外光通信网络的信息传输质量和网络性能，提出了一种新型无线紫外光协作通信网络，网络中各节点采用解码转发方式，设定各节点优先级，从而实现了网络节点实时转发的协作策略。仿真分析了有无缓存设置和有无协作条件下无线紫外光通信网络的归一化吞吐量、各节点平均时延等性能。仿真结果表明：无缓存设置时，随着数据帧传输成功率的增加，高优先级节点一直有较高的归一化吞吐量，而低优先级节点数据帧丢失，归一化吞吐量下降；有缓存设置时，随着缓存的增加，各节点归一化吞吐量均有所增加；与无协作相比，有协作的紫外光通信网络具有更高的节点归一化吞吐量和平均时延。
紫外光通信网络 协作通信 归一化吞吐量 网络时延 ultraviolet light communication network, cooperati
Author Affiliations
Abstract
Advanced Technology Research Center of Shenzhen University, Shenzhen 5180602 Optical-Electronic Information Engineering College, University of Shanghai for Science and Technology, Shanghai 200093
The performance of normalized throughput in wavelength division multiplexing (WDM) based coherent time-spreading optical code division multiple access (TS-OCDMA) system is studied. The upper bound and lower bound of normalized throughput are obtained with 8 wavelength channels and 127-length Gold code, and with 4 wavelength channels and 511-length Gold code respectively. It is shown that when all simultaneous users are equally allocated to different wavelength channels, WDM+TS-OCDMA has much better performance. However, if there is no central control to allocate wavelength channels equally, WDM+TS-OCDMA system has the in-between performance of normalized throughput.
光通信 光码分多址 多址干扰 差拍噪声 归一化吞吐量 060.0060 Fiber optics and optical communications 060.2330 Fiber optics communications Chinese Optics Letters
2009, 7(2): 0298
深圳大学信息工程学院新技术研究中心,深圳,518060
提出了一种多波长OCDMA(MW OCDMA)系统的光解码器方案,通过多个光硬限幅器来抑制多用户干扰.分析了使用该解码器的MW OCDMA误码率性能、频谱效率和归一化吞吐量性能.分析结果表明,该方案能有效改善MW OCDMA系统的误码率性能,在要求的误码率条件下增加同时用户数,从而能有效改善MW OCDMA系统的频谱效率.同时,采用光硬限幅器的MW OCDMA 系统的归一化吞吐量性能明显提高,特别是归一化吞吐量峰值提高了约一倍.
多波长光码分多址 光硬限幅器 误码率 频谱效率 归一化吞吐量 Multi-wavelength optical code-division multiple-ac Optical hard-limiter Bit error rate Spectral efficiency Normalized throughput
