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IEICE Transactions on Communications 2008 E91-B(1):85-94; doi:10.1093/ietcom/e91-b.1.85
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cognitive Radio and Spectrum Sharing Technology -- Papers -- Spectrum Sensing

Outage Performance of Cognitive Radio with Multiple Receive Antennas*

Qinghai YANG1, Shaoyi XU1 and Kyung Sup KWAK1

1 The authors are with UWB-ITRC, Graduate School of Information Technology and Telecommunications, Inha University, #253 Yonghyun-dong, Nam-gu, Incheon, 402-751, Korea. E-mail: qhyang{at}inha.ac.kr


  Abstract

Outage performance of cognitive radios is analyzed in this paper. The scenario under consideration requires the cognitive radio to sense whether the primary user (PU) link is free (i.e. a spectrum hole exists) before making an active transmission using that link. Multiple antennas are available at the cognitive radio link to provide array gains at the sensing stage. We derive a closed-form expression of the outage probability for cognitive transmission by classifying it into several cases. A sensing threshold is deduced according to the PU arrival model illustrated in this paper. Simulation results verify our analysis.

Key Words: outage probability, cognitive radio, spectrum detection, multi-antenna

Manuscript received May 8, 2007. Manuscript revised July 20, 2007.

* This research was supported by the MIC, Korea, under the ITRC support program supervised by the IITA.


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