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Power Allocation and Performance Analysis for the Secondary User under Primary Outage Constraint in Cognitive Relay Network  

Kim, Hyung-Jong (Yonsei University)
Hong, Dae-Sik (Yonsei University)
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Abstract
In this paper, we investigate the power allocation for cognitive relay networks. Cognitive relay networks offer not only increasing spectral efficiency by spectrum sharing but also extending the coverage through the use of relays. For spectrum sharing, conventional works have assumed that secondary users know perfect channel information between the secondary and primary users. However, this channel information may be outdated at the secondary user because of the time-varying properties or feedback latency from the primary user. This causes the violation for interference constraint, and the secondary user cannot share the spectrum of the primary after all. To overcome this problem, we propose the power allocation scheme for the secondary user under the allowable primary user's outage probability constraint. Since the proposed power allocation scheme does not use the instantaneous channel information, the secondary users have lower feedback burden. In addition, the proposed scheme is also robust to the outdated channel environment.
Keywords
Cognitive relay networks; power allocation scheme; outdated channel environments;
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