摘  要：认知无线电技术是一种有效提高频谱利用率的新方法，自适应OFDM能够智能的适应传输信道改变的特性，非常适应认知无线电灵活多变的传输方式。通过对基于传输带宽和固定传输功率的信道分配模型研究，提出一种应用于分布式认知无线电系统的信道及传输功率的自适应分配的方法。仿真结果表明，提出的方法能够有效的对分布式的信道进行功率自适应分配，性能比使用固定发射功率的分布式信道分配的方法有大幅度提升。
关键词：认知无线电；自适应OFDM；功率控制

Abstract: Cognitive radio technology is an effective new method to improve spectral efficiency, adaptive OFDM is able to intelligently adapt to changes in the characteristics of transmission channel is very flexible to adapt to cognitive radio transmission. Through the transmission based on transmission bandwidth and power fixed channel allocation model, presented a distributed cognitive radio systems used in the channel and adaptive transmit power allocation method. Simulation results show that the proposed method is efficient for distributed adaptive channel allocation for power, performance, use fixed transmission power than the distributed channel allocation method has improved significantly.
Key words: cognitive radio; adaptive OFDM; transmit-power control