将认知无线电技术与正交频分复用(OFDM)相结合是解决目前频谱资源匮乏的首选方案之一。通过采用多播技术, 将对同一内容感兴趣的用户作为一个多播组,为系统提供多播业务,使得相同的无线网络资源能够服务更多的用户,有效地利用有限的频谱资源以及发射功率,有效缓解目前频谱资源紧缺现状,具有重要意义。通过对认知 OFDM 系统的单播多播等方面进行归纳分析,介绍了不同的资源分配方法,研究了基于能量效率最大化的认知 OFDM 系统多播资源分配问题,并分析了解决方法,仿真结果表明该算法的有效性。

Cognitive radio is one of the preferred schemes in solving scarce resources of spectrum nowadays, and its combination with orthogonal frequency division multiplexing(OFDM) system has received lots of attention. It is well suited to apply multicast by grouping the users interested in the same content and providing multicast service for them. Therefore, how to efficiently develop multicast delivery in OFDM-based cognitive networks is of vital significance. In order to make full use of the limited resources of spectrum and transmission power and to relieve the situation of scarce spectrum resources, different methods of resource allocation for cognitive OFDM radio network in view of unicasting and multicasting is given. Based on energy efficiency, resource allocation for multicasting cognitive OFDM system is researched, and feasible direction method is used to solve the problem is analyzed. The effectiveness is verified by simulation.

TN925

国家自然科学基金资助项目(61301108,61671244); 中央 高 校 基 本 科 研 业 务 费 专 项 资 金 资 助 项 目(30915011320)