Performance analysis of cognitive relay systems with spectrum- sharing interference under a primary outage probability constraint

doi:10.1016/S1005-8885(14)60263-6

Acta Metallurgica Sinica(English letters) ›› 2014, Vol. 21 ›› Issue (1): 16-21.doi: 10.1016/S1005-8885(14)60263-6

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Performance analysis of cognitive relay systems with spectrum- sharing interference under a primary outage probability constraint

1. College of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China 2. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2013-07-01 Revised:2013-10-17 Online:2014-02-28 Published:2014-02-28
Contact: Sheng-Nan YAN E-mail:yansn@ysu.edu.cn
Supported by:
This work was supported by the National Nature Science Foundation of China (51204145), the Science and Technology Research and Development Program of Qinhuangdao (201302A033).

Abstract

Abstract:

This paper investigates the performance of an underlay cognitive relay system where secondary users (SUs) suffer from a primary outage probability constraint and spectrum-sharing interference imposed by a primary user (PU). In particular, we consider a secondary multi-relay network operating in the selection decode-and-forward (SDF) mode and propose a best-relay selection criterion which takes into account the spectrum-sharing constraint and interference. Based on these assumptions, the closed-form expression of the outage probability of secondary transmissions is derived. We find that a floor of the outage probability occurs in high signal-to-noise ratio (SNR) regions due to the joint effect of the constraint and the interference from the PU. In addition, we propose a generalized definition of the diversity gain for such systems and show that a full diversity order is achieved. Simulation results verify our theoretical solutions.

Key words:

cognitive relay systems, spectrum-sharing interference, outage probability, diversity gain

CLC Number:

TN929.5

YAN Sheng-nan, LI Yan. Performance analysis of cognitive relay systems with spectrum- sharing interference under a primary outage probability constraint[J]. Acta Metallurgica Sinica(English letters), 2014, 21(1): 16-21.

References

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Performance analysis of cognitive relay systems with spectrum- sharing interference under a primary outage probability constraint

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