认知无线电中自适应切换频谱分配准则的算法

在认知无线网络空闲频谱分配的过程中,为了适应认知用户数和空闲频带数的动态变化,提高系统整体性能（主要指系统总带宽收益和认知用户接入公平性）,构造了最大化系统性能的目标函数,设计了在协作最大总带宽收益CMSB（collaborative max sum bandwidth）和协作最大比例公平性CMPF（collaborativemax proportional fair）2种频谱分配准则之间自适应切换的算法,并给出了其具体实施步骤。采用系统总带宽收益和认知用户接入公平性2种性能评估指标,分析了该算法的性能。仿真结果表明,自适应算法可以在保证系统总带宽收益的同时获得更好的公平性,可以提高系统的整体性能。

Algorithm of adaptive switch spectrum allocation rules in cognitive radio networks

In o rder to adapt to the env ironment in w hich the number of idle bands and secondary users were dy namic chang e, and improve overall system perfo rmance ( mainly the sy stemat ic bandw idth gain and access fairness) , the object ive function o f Max imize-Sy stem-Performance w as constructed in the pr ocess of the spect rum allo cat io n in co gnit ive radio netw orks. A new alg orithm w as propo sed w hich co uld adapt sw itch spectrum allocat ion rules betw een the Co llabo rative-Max-Sum-Bandw idth( CMSB) r ule the Collaborat iv e-Max-Pr opo rtio nal-Fair ( CMPF) rule, w ith it s implementat ion steps given. Simulat ion show s that the algo rithm can g et bet ter fairness per formance w hile g uar anteeing the sy stem sum-bandw idth v alue, and can improv e the o verall system performance.