基于认知无线电的卫星频谱共享关键技术研究

项目名称： 基于认知无线电的卫星频谱共享关键技术研究

项目编号： No.60872046

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 王丽娜

作者单位： 北京科技大学

项目金额： 32万元

中文摘要： 本项目提出利用认知无线电技术解决日益增长的频谱需求和频谱利用率低之间的矛盾，实现卫星频谱资源共享。本项目研究了认知无线电引入卫星通信需要解决的几个关键技术，如频谱感知、信道选择、功率控制、干扰温度估测、数据传输和动态频谱接入MAC协议等。 本项目从不同方面提出了几种频谱感知机制，即选择性频谱感知机制、基于距离矢量的频谱感知机制和基于神经网络的频谱感知机制，改善了频谱感知正确率和频谱利用率。 认知卫星网络中主用户根据具有优先权的预约信道fit算法分配时隙，认知用户根据预测算法分配时隙，并采用二进制后退和优先后退的联合算法避免冲突。采用该时隙分配策略，时隙分配的正确率、吞吐量和延时性能均有所改善。 基于定义的效用函数提出一种分布式功率控制算法。该算法具有良好的稳定性和抗雨衰性能，既不会对主用户产生干扰，同时还能满足认知用户的服务质量要求。 基于DOA算法提了一种干扰温度估测方法，可以对干扰温度进行较为准确的估测，提高频谱利用率和网络吞吐量。 本项目在数据传输和动态频谱接入MAC协议方面的研究为后期工作奠定了基础。

中文关键词： 卫星通信;认知无线电;频谱共享

英文摘要： Cognitive radio has been proposed to deal with conflit between the spectrum demand and spectrum under-utilization and implement the sharing of satellite spectrum resources. The research mainly focuses on specturm sensing, power control, medium access control, interference temperature estimation, and so on. We proposed some sepctrum sensing schemes from different aspects, such as selective spectrum sensing scheme, distance vector based spectrum sensing scheme and neutral network based spectrum sensing scheme. The probability of correct sepcturm sensing and spectrum utilization are improved. In cognitive satellite network, the timeslots for satellite primary users were allocated according to the reserve channel with priority fit algorithm and the timeslots for cognitive users were allocated according to the prediction algorithm. The proposed timeslot allocation scheme implemented the combined collision avoidance algorithm based on binary backoff and priority backoff algorithms to avoid collision. The correction ratio of timeslot allocation, throughput and delay performance could be improved. A distributed power control algorithm was proposed based on the defined utility function. This algorithm has good stability and anti-rain attenuation performance. It can guarantee the protection of the primary user and meet quality of service requirements of the cognitive users. The proposed interference temperature estimation method based on DOA algorithm can accurately estimate the interference temperature. The spectrum utilization and throughput can be improved. Researches on data transmission and MAC protocol for dynamic sepctrum access lay foundation for the future work.

英文关键词： Satellite Communication; Cognitive Radio; Spectrum Sharing