面向2G/3G/4G/WLAN融合接入应用的光载无线分布式天线系统

.11g 64QAM、LTE-FDD 64QAM、WCDMA 和EDGE 实现了最好的EVM 值，分别是0.75% 、0.9% 、1.1% 和0.5% ，符合无线标准的相关规定。表明基于SCM-WDM 技术的光载无线分布式天线网络能够实现多制式无线业务上下行链路的高性能传输。

图12 实验测得的EVM 值  

图12 实验测得的EVM 值

5 结束语

本文主要介绍了低成本、高性能、宽带光载无线系统的几项关键技术：低成本、宽带的光收发模块电路设计与研制，链路中光损耗和受激布里渊散射效应对信号传输性能的分析。针对面向2G/3G/4G/WLAN 四网融合接入的应用需求，本文提出了副载波复用结合波分复用的技术，实现了多制式无线业务点到多点的分布式混合传输。为光载无线分布式天线系统的广泛应用提供了有力的支撑和推动。

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