An LLR-based Cognitive Transmission Strategy for Higher Spectrum Reutilization

被引：0

作者：

Haghighi, Kasra ^{[1
]}

Strom, Erik G. ^{[1
]}

Agrell, Erik ^{[1
]}

机构：

[1] Chalmers, Dept Signals & Syst, Commun Syst Grp, S-41296 Gothenburg, Sweden

来源：

2011 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE (GLOBECOM 2011) | 2011年

关键词：

Cognitive radio; hidden Markov model; interference ratio; spectrum sensing and spectrum utilization;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Reutilization of the spectrum licensed to services with low occupancy is of great interest for cognitive radios (CRs). To achieve this goal, we introduce a simple hidden Markov model which captures the primary users activity, signal uncertainties, and noise. For evaluating the performance of any CR, two new criteria are presented entitled spectrum utilization ratio (UR) and interference ratio (IR). Based on this model and new measures, a new a-posterior log-likelihood-ratio based CR is designed and implemented. Its performance is compared with standard energy-detection based spectrum-sensing CR. We demonstrate more than 300% increase in UR for up to 1% allowed interference at the SNR of -5dB.

引用

页数：5

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