Cognitive spectrum sharing with bi-directional secondary system

Qiang Li, Ashish Pandharipande, Xiaohu Ge

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

4 Citations (Scopus)


A cognitive spectrum sharing protocol based on the two-path relay channel is proposed in this paper, where a primary transmitter keeps transmitting new messages to a corresponding receiver and two secondary users alternately decode-and-forward (DF) the primary messages. Upon successful decoding of the primary message, each secondary user superimposes its own message on the relayed message through a certain power allocation. Otherwise, the secondary user simply stays silent. In view of the memorylessness that the DF process at a secondary user in the current time slot depends on the DF process at the other secondary user in the previous time slot, a Markov framework is proposed to analyze the state transitions between staying silent and accessing the spectrum of the secondary users. Based on this framework, the outage probability and throughput are characterized for the primary and secondary users respectively. Our results demonstrate that with a prudential power allocation, the performance of the primary users can be significantly improved and bi-directional communications between two secondary users can be facilitated simultaneously.

Original languageEnglish
Title of host publicationProceedings of the 2014 9th International Conference on Cognitive Radio Oriented Wireless Networks and Communications, CROWNCOM 2014
PublisherIEEE Computer Society
Number of pages6
ISBN (Print)9781631900037
Publication statusPublished - 1 Jan 2014
Externally publishedYes
Event9th International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCom 2014) - Oulu, Finland
Duration: 2 Jun 20144 Jun 2014
Conference number: 9


Conference9th International Conference on Cognitive Radio Oriented Wireless Networks (CROWNCom 2014)
Abbreviated titleCROWNCom 2014


  • bidirectional secondary system
  • cooperative relaying
  • Markov chain
  • Spectrum sharing


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