认知OFDM无线网络动态资源分配研究

摘要

Cognitive radio is one of the primary schemes to deal with spectrum scarcity nowadays, and its combination with OFDM (Orthogonal Frequency Division Multiplexing) system draws great attention. In order to make full use of the scarce spectrum resources and transmission power and to relieve the situation, the paper summarized and analyzed the cognitive OFDM system regarding spectrum sharing strategy, unicast and multicast, fairness, relay-aided etc., introduced various resource allocation methods, studied the current situation of dynamic resource allocation research, and focused on the advantages and disadvantages analysis of each method. Finally the possible issues for future study in this ifeld were proposed.%认知无线电技术是解决目前频谱资源匮乏的首选方案之一，与正交频分复用系统的有机结合广受关注。为了充分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的现状，通过对认知正交频分复用系统的频谱共享策略、单播多播、保证公平性、基于中继辅助等方面进行归纳分析，介绍了不同的资源分配方法，研究了认知正交频分复用无线网络动态资源分配问题的研究现状，着重分析了各方法的优缺点，并设想和展望了今后该领域的热点研究问题。