A low-interference relay selection for decode-and-forward cooperative network in underlay cognitive radio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

17 Citations (Scopus)

Abstract

In the underlay decode-and-forward (DaF) cooperative cognitive radio (CR) network, an optimal relay can be selected by the conventional max-min selection on the condition of not violating the interference temperature (IT) limit. However, the max-min selection may cause some extra amount of interference to the primary system (PS) such that the so-called transfer ratio (TR) can be lower. Note that TR is newly defined as the ratio of the secondary system's (SS's) capacity gain to the PS's capacity loss due to the activities of SS. In order to improve the TR value, we are motivated by the pricing function in Game theory to propose a novel low-interference relay selection by taking the impacts of the interference from SS to PS into consideration. Using the low-interference selection, however, the optimal relay may not always be picked. To clarify this phenomenon, the still optimal probability is defined as the probability of selecting the optimal relay by the proposed scheme. In addition, the impact of the low-interference selection on the SS's capacity is also analyzed. The simulation results prove not only the exactness of the analytical results but also the superior performance in terms of the TR value and total capacity which also indicates that a higher spectrum efficiency can be achieved. It is believed that the results of this paper can provide an alternative viewpoint of evaluating the spectrum efficiency and inspire more interesting and important research topics in the future.

Original languageEnglish
Title of host publicationProceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011
Pages306-310
Number of pages5
DOIs
Publication statusPublished - 2011 Oct 24
Event2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011 - Osaka, Japan
Duration: 2011 Jun 12011 Jun 3

Publication series

NameProceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011

Other

Other2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011
CountryJapan
CityOsaka
Period11-06-0111-06-03

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Communication

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    Chang, C-W., Lin, P. H., & Su, S-L. (2011). A low-interference relay selection for decode-and-forward cooperative network in underlay cognitive radio. In Proceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011 (pp. 306-310). [6030797] (Proceedings of the 2011 6th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2011). https://doi.org/10.4108/icst.crowncom.2011.245893