认知无线电中认知用户的重新建模与性能分析

doi:10.3969/j.issn.1000-436x.2012.11.014

Abstract

Abstract:

A number of errors in the past Markov model and theoretical analysis were discussed in spectrum access based on cognitive radio network (CRN).To imitate the behav ary user (PU) and secondary user (SU) factually,new models for access strategy were presented.The performance of CRN based on different access strategies were reappraised and compared by using matrix geometric theory and event scheduling of discrete events system simulation.Theoretical analysis results and simulation experiments were tally close,which confirms the reliability of proposed models.The access strategies with handoff and channel reservation efficiently decrease the call dropping probability,as while as,increase the blocking probability.And the thought for CRN can reach the maximum in the latter with the optimum number of reserved channels.

Key words: cognitive radio, dynamic spectrum access, Markov, spectrum hand-off, channel reservation

Wei LIN,Yu FU,Qin-yu ZHANG,Ye WANG,Sheng WANG. Performance analysis and re-modeling of secondary users in cognitive radio system[J]. Journal on Communications, 2012, 33(11): 108-121.

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