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http://dx.doi.org/10.6109/jicce.2011.9.5.515

Cooperative Diversity in a Spectrum Sharing Environment  

Ban, Tea-Won (Mobile laboratory, KT)
Jung, Bang-Chul (Dept. of Information and Communication Engineering, College of Marine Science and Institute of Marine Industry, Gyeongsang National University)
Publication Information
Journal of information and communication convergence engineering / v.9, no.5, 2011 , pp. 515-522 More about this Journal
Abstract
In this paper, we investigate cooperative diversity in a spectrum sharing environment where secondary users utilize primary users' spectrum only if the interference power received at the primary users is maintained below a predetermined level. The outage probability of a selective decode-and-forward (DF) based cooperative diversity scheme in the secondary network is derived to analyze the effects of spectrum sharing on cooperative diversity. Our analytical and simulation results show that the outage probability is saturated at a certain level of transmit power of secondary users due to interference regulation, and, hence, cooperative diversity gains are lost. Through asymptotic analysis, we also identify the critical value of transmit SNR beyond which the outage probability is saturated.
Keywords
congnitive radio; cooperative relaying; diversity; outage probability;
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