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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。
The combination of cognitive radio technology and orthogonal frequency division multiplexing (OFDM) is one of the preferred solutions to the current shortage of spectrum resources. By adopting multicast technology, a user who is interested in the same content is regarded as a multicast group, which provides multicast service for the system so that the same wireless network resource can serve more users, make effective use of limited spectrum resources and transmit power , Effectively alleviate the current shortage of spectrum resources, is of great significance. This paper introduces different methods of resource allocation by summarizing and analyzing unicast multicast of cognitive OFDM systems. The problem of allocation of multicast resources in cognitive OFDM systems based on maximizing energy efficiency is also studied. The solution method, simulation The results show the effectiveness of the algorithm.