基于预留最优信道机制的CR动态频谱接入研究

doi:10.3969/j.issn.1000-0801.2011.07.017

摘要/Abstract

摘要：

在认知无线电网络中，如何提高次用户的性能是当前研究的热点。针对等级覆盖式频谱接入模型进行研究分析，考虑了动态频谱切换过程，建立三维的持续时间马尔可夫链模型，计算出切换概率、阻塞概率、掉线概率，并综合分析各个参数对这些概率的影响。同时提出为主用户预留最优信道数的方案，数值结果表明此方案能有效降低次用户的切换概率和掉线概率，使次系统的切换概率、阻塞概率、掉线概率更加均衡，且提高了次用户系统的接入容量。

关键词: 认知无线电, 动态频谱接入, 马尔可夫链

Abstract:

In cognitive radio network,how to improve secondary userˊs performance is the hot spot in the current research.This paper focuses on the research and analyses of the Hierarchical overlay spectrum access model.Dynamic spectrum handoff process is accounted,modeling the three-dimensional of continuous time Markov chains.We calculate the handoff probability,the blocking probability,the dropping probability and comprehensively analyse various parameters for the influence of these probabilities.In the meantime,presented the optimal channel reserved scheme for primary user,the numerical results show that the scheme can effectively reduce the handoff probability and the dropping probability,making the handoff probability,the dropping probability,and the blocking probability more balanced in secondary users system and improving the access capacity of secondary system.

Key words: cognitive radio, dynamic spectrum access, Markov chain

徐昌彪,袁伟,鲜永菊,张坤. 基于预留最优信道机制的CR动态频谱接入研究[J]. 电信科学, 2011, 27(7): 74-79.

Changbiao Xu,Wei Yuan,Yongju Xian,Kun Zhang. Research for CR Dynamic Spectrum Access Based on Optimal Channel Reservation Mechanism[J]. Telecommunications Science, 2011, 27(7): 74-79.

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参考文献 10

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