摘  要： OFDM和认知无线电思想以及一系列自适应传输技术结合，从而达到无线电资源的合理分配和充分利用。为寻求保证服务质量和最大通过率下的最佳工作状态，需综合应用动态子载波分配技术、自适应子载波的功率分配技术、自适应调制解调技术以及自适应编码技术等一系列自适应技术，形成优化的自适应算法。通过研究基于认知无线电技术的OFDM多用户功率控制配算法，提出兼顾比例公平原则的改进算法。仿真结果表明，改进算法可以大幅提高频谱资源利用率和通信性能。
关键词： OFDM；动态资源分配；载波分配；功率分配

Abstract: Thinking of OFDM and cognitive radio technologies and a range of adaptive transmission, so as to achieve rational allocation of radio resources and make full use. Seeking to ensure quality of service and maximum throughput rates of the best working conditions, to be integrated application of dynamic subcarrier allocation, adaptive sub-carrier power allocation, adaptive modulation and demodulation technology, and adaptive coding techniques and a series of adaptive technology, the formation of optimal adaptive algorithm. By studying the OFDM based cognitive radio technology with multi-user power control algorithm, taking into account the principle of equity ratio improved algorithm. Simulation results show that the improved algorithm can significantly improve the spectrum utilization of resources and communication performance.
Key words: OFDM;multi-user dynamic resource allocation;sub-carrier allocation;power allotment