认知无线电动态频谱分配新算法

动态频谱分配技术是认知无线电的一项关键技术，本文针对以OFDM为传输技术的认知无线电系统，提出了固定速率认知用户和变速率认知用户并存情况下的动态频谱分配新算法。本文算法以最小化每比特发射功率为目标，运用最小最大准则与分步求解的方法，对系统目标函数予以简化，在最大公平意义上对认知小区的空闲频谱资源进行动态分配。仿真结果表明，该算法具有较好的公平性，在固定速率用户功率最小化需求和变速率用户吞吐量最大化的需求之间取得了比较好的平衡，适用于两种需求用户并存环境下的认知无线电系统。 

Novel Dynamic Spectrum Allocation Algorithm for Cognitive Radio

Dynamic spectrum allocation is a key technology of the cognitive radio. In this paper, a new spectrum allocation algorithm for cognitive radio is proposed based on the analysis of the OFDM based cognitive radio system. For this system that the constant rate users and the variable rate users were coexistence with each other, the proposed algorithm is minimizing the transmitted power per bit, allocating the free spectrum in the cognitive radio cell dynamically in a sense of fair maximization. The system object function is simplified by using the min-max criterion and the multi-step method. Simulation results are presented to confirm the performance of the proposed algorithm. It’s achieves not only the fair allocation of the spectrum resource but also the balance between the power minimization of the constant rate users and the throughput maximization of the variable rate users, it’s suitable for the situation that there exist two kinds of users in the cognitive radio system.