Higher-order statistics based sequential spectrum sensing for cognitive radio

Hsing Yi Hsieh, Han Kui Chang, Meng Lin Ku

研究成果: 書貢獻/報告類型會議論文篇章同行評審

11 引文 斯高帕斯(Scopus)

摘要

In cognitive radio (CR), spectrum sensing is a key enabling functionality to discover the vacant spectrum which is not occupied by primary systems. With good sensing capability, secondary users can effectively recycle the spectrum resource without disturbing active primary users. Energy detector (ED) is a commonly used and relatively simple spectrum sensing technique. In realistic environments, the CR receiver might operate at low signal-to-noise ratio (SNR) regimes due to the channel fading and noise uncertainty. At low SNR cases, the performance of the EDs degrades dramatically as the signal and noise are mixed together after the operation of energy calculation. In this paper, a high-order statistics (HOS) based sequential test detector is investigated to sense the underutilized spectrum, particularly for low-SNR applications. We resort to HOS, in terms of cumulant statistics, for overwhelming the Gaussian noise effect and improving the spectrum sensing reliability. Based on these cumulants, a binary hypothesis testing problem is formulated and a low-complexity sequential probability ratio test (SPRT) is developed for efficiently and fast detecting the vacant spectrum so as to meet the sensing duration requirements. Our numerical results show that the proposed detector outperforms the conventional EDs at extremely low SNR environments.

原文???core.languages.en_GB???
主出版物標題2011 11th International Conference on ITS Telecommunications, ITST 2011
頁面696-701
頁數6
DOIs
出版狀態已出版 - 2011
事件2011 11th International Conference on ITS Telecommunications, ITST 2011 - St. Petersburg, Russian Federation
持續時間: 23 8月 201125 8月 2011

出版系列

名字2011 11th International Conference on ITS Telecommunications, ITST 2011

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???event.eventtypes.event.conference???2011 11th International Conference on ITS Telecommunications, ITST 2011
國家/地區Russian Federation
城市St. Petersburg
期間23/08/1125/08/11

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