Cognitive spectrum sharing with two-way relaying systems

Qiang Li, See Ho Ting, Ashish Pandharipande, Yang Han

Research output: Contribution to journalArticleAcademicpeer-review

129 Citations (Scopus)


Dynamic spectrum-sharing protocols are gaining attention due to the need for improved spectrum utilization. We propose a spectrum-sharing protocol with two-way relaying systems, where two licensed primary users A and B communicate with each other with the assistance of an unlicensed secondary transceiver C, which acts as a relay. The secondary transceiver C gains spectrum sharing by using a decode-and-forward (DF) relay protocol and superposing the secondary transmission on network-coded primary signals. We analytically derive the outage probabilities for both the primary and secondary systems under the proposed cognitive two-way relaying (CTR) protocol. Our results show that a spectrum-sharing region exists such that, as long as C is located within this region, there will be a power-allocation threshold above which the proposed CTR protocol is able to provide a better (or an equal) outage performance for the primary system and, at the same time, achieve secondary spectrum sharing.

Original languageEnglish
Article number5682071
Pages (from-to)1233-1240
Number of pages8
JournalIEEE Transactions on Vehicular Technology
Issue number3
Publication statusPublished - Mar 2011
Externally publishedYes


  • Decode-and-forward (DF)
  • network coding
  • spectrum sharing
  • two-way relaying


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