多信道无线网络中细粒度带宽自适应与动态接入技术研究

Concurrent communication over multiple channels in wireless networks has the capability to alleviate interference, enhance the wireless media utilization and facilitate flexible access, and therefore it will play crucial role in the future broadband wireless networks. There are three crucial problems in the operation of concurrent communication-enabled multi-channel wireless networks, first, how to construct multiple channels in a fine-grained and efficient way , second, how to allocate these multiple channels among distributed users and distributedly coordinate their concurrent communications, and third, how to evaluate its ability to transparently support the quality of end-to-end service. This proposal is to extensively study the theories and techniques related to these three problems, in order to find ideal solutions to them. First, we will model the operation of multi-channel wireless network and analyze its capacity, which will provide the theoretical basis for the followed research. Second, we will move on to the research of channel construction and dynamic access at the granularity of sub-carrier, in order to provide a unified framework for fine-grained channel-width adaptation and dynamic channel access. Third, we will study the theory and techniques in allocating channels and radio interference for concurrent communication among distributed users, in which we will utilize the user cooperation to improve the efficiency of resource allocation. In the end, taking into consideration of all factors in the time and frequency domains, we will study the theory and techniques in available bandwidth estimation for multi-channel wireless networks, in order to provide a general method for evaluate its transparent ability to support the quality of end-to-end service. The outcomes of this proposal could straightly be applied to increase the performance efficiency of broadband wireless networks, including to design high-efficient wireless multi-channel MAC protocols and to optimize resource utilization. They could also further popularize the cognitive radio network, which is essentially based on the dynamic multi-channel/spectrum access.

多信道并行通信应用于无线网络既可减少密集用户间的干扰，也可提高网络接入的灵活性和资源利用效率，已成为高带宽无线网络的重要趋势。多信道无线网络中存在三个核心问题：如何高效细粒度的构建多信道、如何分配信道等资源并分布式协调用户间的无干扰并行通信、如何确定多信道复杂环境下网络对端到端服务的透明支持能力。本项目拟围绕这三大问题开展研究。首先，研究多信道无线网络建模和容量分析，为解决上述问题提供理论支撑。然后，研究以子载波为带宽调节粒度的多信道构建和接入技术，建立细粒度的信道带宽自适应接入方案。进一步，研究多信道网络中的信道分配和射频接口匹配等问题，利用用户间的协作完成高效的资源优化分配，以及并行通信与组网调度。最后，研究多信道无线网络中可用带宽估计理论与方法，建立较通用的多信道网络端到端服务能力评估机制。研究成果可直接用于实现高带宽高效率的多信道并行无线网络，更可促进认知无线网络的发展和实用化。

多信道并行通信应用于无线网络既可减少密集用户间的干扰，也可提高网络接入的灵活性和资源利用效率，已成为高带宽无线网络的重要趋势。本项目围绕多信道无线网络中存的三个核心问题开展了全面和深入的研究，即如何高效细粒度的构建多信道、如何分配信道等资源并分布式协调用户间的无干扰并行通信、如何确定多信道复杂环境下网络对端到端服务的透明支持能力。具体而言，首先，研究了多信道无线网络建模和容量分析，为解决上述问题提供理论支撑。其次，研究了以子载波为带宽调节粒度的多信道构建和接入技术，建立了细粒度的信道带宽自适应接入方案。然后，研究了多信道网络中的信道分配和射频接口匹配等问题，利用用户间的协作完成高效的资源优化分配，以及并行通信与组网调度。更进一步，为了提高多信道接入的抗干扰能力，提出了一种全新的不依赖于任何公共控制信道的“盲汇聚”机制，其四大优点是：汇聚双方完全不用知道对方的可用信道信息、不需要时间上的同步、不需要公共的控制信道或者专用控制时隙、能实现全信道分集。最后，研究多信道无线网络中可用带宽估计理论与方法，建立较通用的多信道网络端到端服务能力评估机制。研究成果可用于实现高带宽高效率的多信道并行无线网络，更直接用于支撑无人系统的自组织网络。在本项目的支持下，发表和已录用了与项目研究内容密切相关的学术论文44篇，其中影响因子3.0以上的国际期刊论文12篇，合计SCI检索25篇，EI检索11篇，1篇进入ESI前0.1%,3篇进入ESI前10%。以本项目的研究成果为支撑申请国家发明专利14项（其中4项已授权），由科学出版社出版中文专著2部。