在实际的无线通信系统中，由于通信节点所处空间位置不同，其可用的频谱资源也并不相同。为克服这一频谱异构环境所造成的频谱资源管控困难，认知ad hoc网络需要利用协作感知技术增强网络节点频谱感知的准确性和空间范围，并根据感知结果合理控制网络节点对异构频谱资源的接入，以尽可能地提供收发皆可用的通信频段。为此，本项目拟在频谱异构环境下针对基于协作感知的认知ad hoc网络MAC协议设计进行深入研究，在探索低时钟同步要求和附加开销相对固定的分布式协作感知方法的基础上，突破基于带外公共控制信道、带内跳频和带内分簇等多种控制信息交互方式的认知ad hoc网络MAC协议设计，揭示认知ad hoc网络在可用频谱资源不均衡环境中实现自主适变频谱管控的一般性规律，并对所提出的关键技术和方法进行基于软/硬件的仿真验证和性能评估，为解决认知ad hoc网络在实用化过程中所面临的关键性频谱资源管控问题奠定基础。

In a practical wireless communication system, different spatial locations of communication nodes may result in the difference of their available spectrum resources. To overcome the difficulty of spectrum resource management caused by this environment of spectrum heterogenity, cognitive radio ad hoc networks should adopt the technique of cooperative sensing to enhance the accuracy and spatial range of spectrum sensing by network nodes, control the access of heterogeneous spectrum resources by network nodes reasonably based on the sensing results, and provide as much as possible the communication spectrums that are available for both transmitters and receivers. Thus the present project proposes to perform throrough research on the design of MAC protocols for cognitive radio ad hoc networks based on cooperative sensing in the environment of spectrum heterogenity. By exploring the methods of distributive cooperative sensing with low time synchronization requirements and relatively fixed additional costs, we shall breakthrough the design of MAC protocols for cognitive radio ad hoc networks based on various mechanisms for exchanging control information, i.e. out-band common control channel, in-band frequency hopping and in-band clustering,. Hopefully, this research would disclose the general principle for cognitive radio ad hoc networks to perform self-adaptive spectrum management in the heterogeneous environment of available spectrum resources. Through the software- or hardware-based simulation, verification and performance evaluation on the proposed key techniques and methods, this project could build a solid basis for solving the key problems of spectrum resource management in implementing practical cognitive radio ad hoc networks.