Spectrum Management in Cognitive Radio Ad Hoc Networks

该奖项是根据2009年美国恢复和再投资法案(公法111-5)资助的。本研究的目标是为认知无线电自组织网络开发一个频谱管理框架。该项目调查了分布式多跳架构、动态网络拓扑以及这些网络中频繁变化的频谱所带来的挑战。到目前为止，这方面的研究主要集中在基于基础设施的网络上。这项研究旨在强调分布式操作中的主要挑战，并为每个挑战提供协议级解决方案。在智能优势方面，该研究有可能导致一种合作策略，在可接受的通信成本下提高感知精度。为了实现节点之间的这种交互，设计了一种按需可靠的公共控制信道。为了确定最佳传输频谱，提出了一种联合频谱和路径选择方法。此外，还提出了一种认知无线电媒体接入控制协议，其目标是提供干扰避免以及有效的频谱利用。最后，为了保证认知无线电节点在频段间切换时的高效运行，提出了一种频谱感知的路由恢复框架。从更广泛的影响来看，研究结果将导致佐治亚理工学院首席研究员讲授的认知无线电网络的选题。此外，认知无线电模拟器是该项目的一部分，并将在课堂上作为教育工具使用。寻求与工业界和学术机构的合作，以传播当前的最新技术。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The objective of this research is to develop a spectrum management framework for cognitive radio ad hoc networks. The project investigates the challenges posed by the distributed multi-hop architecture, the dynamic network topology, and the frequently changing spectrum seen in these networks. Up to now, the research in this area has mainly focused on infrastructure-based networks. This research aims to highlight the major challenges in the distributed operation and provide protocol-level solutions for each of them.With respect to intellectual merit, this research has the potential to lead to a cooperation strategy that improves the sensing accuracy at an acceptable communication cost. To enable this interaction between nodes, an on-demand reliable common control channel is devised. For determining the best spectrum for transmission, a joint spectrum and route selection method is developed. Moreover, a cognitive radio medium access control protocol is proposed, with goals of providing interference avoidance as well as efficient spectrum utilization. Finally, a spectrum-aware route recovery framework is proposed for efficient operation when the cognitive radio nodes switch between frequency bands.With respect to broader impact, research results will lead to selected topics for a Cognitive Radio Networks taught by the principal investigator at Georgia Tech. Moreover, a cognitive radio simulator is implemented as part of this project and will be used in the class as an educational tool. Collaboration with industry and academic institutions is pursued to disseminate the current state-of-the-art.