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中文摘要：
无线频谱资源的匮乏和多用户争用环境,导致认知无线网络中频谱切换研究面临严峻挑战.本文阐述了频谱切换的基本原理,包括频谱切换的概念和特征、频谱切换的主动决策和被动决策分类、频谱切换过程及建模抽象的方法等几个方面.其次,重点以数学建模工具为主线,综述了基于概率论、马尔可夫过程、排队论、模糊逻辑、模糊神经网络等5类代表性的频谱切换算法,评述了学术界在各类频谱切换算法上的重要研究成果;最后,基于对已有算法和研究成果的分析,总结了当前研究中存在的非理想频谱检测、目标信道选择、空闲信道动态性等主要问题,预测了频谱切换的未来研究方向.
英文摘要：
The research of the cognitive radio networks is facing rigorous challenges with the insufficience of the ra-dio spectrum resources and multi-user contention environment.The fundamental principles of the spectrum handoff was elab-orated,including the concepts and characteristics of the spectrum handoff,the classification of the proactive and reactive de-cisions of the spectrum handoff,spectrum handoff process abstract modeling methods,etc.Then five spectrum handoff algo-rithms based on the probability theory,Markov process,queuing theory,fuzzy logic,fuzzy neural network,were summarized, which were mainly on the ground of mathematic modeling tools.Some significant research findings of each spectrum handoff algorithm in the academic circle were reviewed.Finally,on account of the analysis of the existing algorithms and research a-chievements,some important problems of imperfect spectrum detection,target channel selection,idle channel dynamic char-acter that were existed in the current research were summarized and the future research direction of the spectrum handoff were predicted.
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