中文摘要：

为满足疯狂增长的数据业务需求，近年来蜂窝基站的部署越来越趋于小型化和密集化，这就对回传技术性能提出了更高的要求。该文将WiFi作为5G网络中的一种无线回传技术，提出一种基于WiFi多信道聚合的高速同步回传方案。现有WiFi协议（如IEEE 802.11n/ac）采用静态或动态信道绑定技术可将多个具有连续频谱的信道聚合为单一宽信道，从而提高网络容量。但是，静态绑定方式不够灵活，动态绑定方式在密集用户分布下也很难发挥其优势。该文则通过在单一网络节点上配置多射频实现非连续频谱的WiFi多信道聚合，其在扩展传输带宽，提升网络性能的同时，也可以有效克服802.11n/ac中信道绑定方式的弊端。方案主要包括3部分：多节点联合信道扫描、多信道同步收发控制及干扰检测。理论分析和仿真结果表明，所提非连续频谱的WiFi多信道聚合方案的回传性能优于802.11n/ac中连续频谱聚合方案，且多信道同步传输能有效抑制回传网络中的邻道干扰。最后，由搭建的原型验证系统证明了所提方案的可行性及有效性。

英文摘要：

As the substantial growth of data traffic over the past few years, the deployment of cellular base stations tends to be smaller and denser which puts forward higher requirements for backhaul techniques. In this study, WiFi is taken as a backhaul technique in 5G networks, and then a high-speed synchronous backhaul solution is proposed with aggregation of multiple WiFi channels of which the spectrum is non-continuous. Although IEEE 802.11n/ac can achieve channel aggregation with static/dynamic channel bonding scheme, the spectrum of these channels must be continuous. Moreover, static channel bonding is not flexible enough and dynamic channel bonding rarely has chance to be implemented when devices are deployed densely. The proposed solution can not only extend transmission bandwidth and improve network capacity of 5G backhaul networks, but also overcome defects of channel bonding in 802.11n/ac. Both analytical results and simulations show that the performance of the proposed solution is better than the traditional channel bonding and it can reduce adjacent channel interference among multiple channels in 5G backhaul networks. Meanwhile, the effectiveness and feasibility of the proposed solution are proved by the prototype verification system.