支持下一代WLAN标准IEEE802.11n/ac的光载无线技术研究

With the development of intelligent terminals and Internet, the wireless local-area networks (WLAN) are becoming more and more popular worldwide, and have been the most-widely used broadband wireless access technology. The further development of WLAN technology is facing three problems in coverage, interference, and maintenance. The three problems can be effectively solved by combining WLAN and radio-over-fiber (ROF) technologies. Nevertheless, in the new-generation WLAN standards (i.e. IEEE802.11n/ac), two operating frequency-bands (i.e. 2.4GHz and 5GHz) are defined, and advanced multi-input multi-output (MIMO) technique is adopted. In addition, IEEE802.11n/ac standards significantly enhance the network throughput. All these new features pose stringent requirements and challenges. After specifying the new requirements and challenges, this project is aimed at intensive studies on dual-band ROF technology compatible to IEEE 802.11n/ac standards from three aspects in terms of enabling techniques, transmission link, and network modeling. In this project, three scientific issues will be mainly addressed, including the compensation of nonlinear distortions, the MIMO multiplexing mechanism in transmission of wireless signals, as well as the hidden-node and competitive fairness problems in a multi-RAU architecture. Finally, the research is expected to provide important theoretical evidence and technical basis for future application of the WLAN-over-fiber systems.

随着智能终端和互联网的飞速发展，无线局域网（WLAN）在全球迅速普及，并成为当今全球应用最广泛的宽带无线接入技术。WLAN的发展面临着覆盖、干扰和维护三方面的问题。将WLAN与光载无线（ROF）技术结合起来可以有效解决上述三方面问题。然而，新一代WLAN标准（IEEE802.11n/ac）兼容2.4GHz和5GHz两个频段，采用了先进的多入多出（MIMO）技术，并大幅提高了网络吞吐量，这些新特点对ROF技术提出了新的要求和挑战。本项目围绕IEEE802.11n/ac标准对ROF系统的要求与挑战，在单元技术、传输链路和网络模型三个层面深入系统研究支持双频段IEEE802.11n/ac标准的ROF技术，着力解决非线性补偿、MIMO无线信号多模光纤复用增益机制和多RAU条件下隐藏节点与竞争公平性三类科学问题，最终为WLAN-over-fiber系统的发展及应用提供重要的理论依据和技术支撑。

新一代WLAN标准（IEEE802.11n/ac）兼容2.4GHz和5GHz两个频段，采用了先进的多入多出（MIMO）技术，并大幅提高了网络吞吐量，对ROF技术提出了新的要求和挑战。本项目重点围绕IEEE802.11n/ac标准对ROF系统的要求与挑战，在单元技术、传输链路和网络模型三个层面深入系统研究支持双频段IEEE802.11n/ac标准的ROF技术。本项目提出了多频段ROF非线性行为模型与低复杂度数字线性化方法；搭建了多种基于空分复用的光载无线MIMO传输系统；研究了基于光载无线技术分布式天线系统的MAC层关键技术；提出了硬件受限条件下的多频段宽带ROF带通采样及恢复方案。.项目执行期间发表SCI文章10篇，其中影响因子大于2.0的文章7篇；发表国际会议报告15篇；国际会议特邀报告3篇；申请国家发明专利6项。