| 基于隐马尔可夫模型的协作频谱检测策略 |
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| 引用本文： | 麦磊鑫,秦晓卫,戴旭初.基于隐马尔可夫模型的协作频谱检测策略[J].中国科学技术大学学报,2011,41(4). |
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| 作者姓名： | 麦磊鑫 秦晓卫 戴旭初 |
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| 作者单位： | 中国科学技术大学电子工程与信息科学系,安徽合肥,230027 |
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| 基金项目： | 国家重点基础研究发展(973)计划，国家科技支撑计划，广东省中国科学院全面战略合作项目 |
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| 摘 要： | 频谱检测是认知无线电的基础和关键技术,将其建模为隐马尔可夫模型(hidden Markov model,HMM),并由此提出基于隐马尔可夫模型的协作频谱检测策略.该策略首先使用Baum-Welch法对HMM的系统参数进行最大似然估计;然后基于HMM模型,利用各次用户的检测信息以及过去信道状态的后验概率信息进行贝叶斯推理,更新当前时隙信道状态的后验概率;最后根据最大后验概率准则对当前时隙的信道状态进行最终判决.使用后验概率,该策略可进一步估计系统协作检测的性能,在满足系统协作检测性能要求的前提下,选择尽可能少的、检测性能较优的次用户来参与协作,以节约开销和降低复杂度.仿真实验表明,所提出的策略的系统检测性能优于基于大数判决、似然比和Chair-Varshney准则的协作频谱检测策略.
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| 关 键 词： | 协作频谱检测 隐马尔可夫模型 贝叶斯推理 最大后验概率准则 |
Hidden Markov model based spectrum sensing strategy with cooperation |
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| MAI Leixin,QIN Xiaowei,DAI Xuchu.Hidden Markov model based spectrum sensing strategy with cooperation[J].Journal of University of Science and Technology of China,2011,41(4). |
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| Authors: | MAI Leixin QIN Xiaowei DAI Xuchu |
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| Institution: | MAI Leixin,QIN Xiaowei,DAI Xuchu(Department of Electronic Engineering and Information Science,University of Science and Technology of China,Hefei 230027,China) |
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| Abstract: | Spectrum sensing is the foundation and key technology of cognitive radios.Hidden Markov Model(HMM) was used to model the spectrum sensing problem,and a cooperative spectrum sensing strategy based on HMM was proposed.First of all,the strategy estimated the HMM system parameters by utilizing a maximum likelihood parameter estimation method called Baum-Welch algorithm.Secondly,the posterior probability of the channel state in the current slot was updated by Bayesian inference,which was based on HMM and deduced... |
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| Keywords: | cooperative spectrum sensing hidden Markov model Bayesian inference maximum a posterior criterion |
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