认知无线电下行链路中的频谱共享算法
doi: 10.3724/SP.J.1146.2008.00300
Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems
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摘要: 该文提出了一种适用于下行认知无线电系统的频谱共享算法，在保证对授权用户的干扰低于限制和总发射功率受限的条件下最大化系统总容量。分析了对授权用户的干扰并给出设置干扰限制的方法，在此基础上分两步实现总容量的最大化：先通过最大信道信干噪比原则实现最优的子载波分配；然后利用提出的双注水方法计算最优的功率分配。仿真结果表明，相比传统的频谱共享算法，该算法可以获得显著的系统容量增益。Abstract: A spectrum sharing algorithm for downlink cognitive radio systems is proposed to maximize the system capacity under total transmission power and interference constraints. Interference to the licensed users is analyzed, and a method to set interference constraint is given accordingly. Based on the interference constraint, the maximum system capacity is achieved by two steps: first the optimal subcarrier allocation is derived by the maximum channel signal to interference plus noise ratio rule; then transmission power is optimally allocated by the proposed double water-filling method. Simulation results show this algorithm can provide significant capacity gain comparing with the conventional spectrum sharing algorithms.
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