A cooperative sensing based cognitive relay transmission scheme without a dedicated sensing relay channel in cognitive radio networks

Yulong Zou, Yu Dong Yao, Baoyu Zheng

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

In this correspondence, we investigate a selective relay spectrum sensing and best relay data transmission (SRSS-BRDT) scheme for multiple-relay cognitive radio networks. Specifically, in the spectrum sensing phase, only selected cognitive relays are utilized to transmit/forward their initial detection results (without a dedicated sensing relay channel) to a cognitive source for fusion, where the dedicated sensing channel refers to the channel transmitting initial spectrum sensing results from cognitive relays to the cognitive source. In the data transmission phase, only the best relay is selected to assist the cognitive source for its data transmissions. By jointly considering the two phases, we derive a closed-form expression of the outage probability for the SRSS-BRDT scheme over Rayleigh fading channels. We show that the SRSS-BRDT scheme outperforms the traditional cognitive transmission scheme (with a limited dedicated sensing channel) in terms of the outage probability performance. In addition, numerical results illustrate that the outage probability of the SRSS-BRDT scheme can be minimized through an optimal allocation of the time durations between the spectrum sensing and data transmission phases.

Original languageEnglish
Article number5620988
Pages (from-to)854-858
Number of pages5
JournalIEEE Transactions on Signal Processing
Volume59
Issue number2
DOIs
StatePublished - Feb 2011

Keywords

  • Cognitive radio
  • cognitive relay
  • cognitive transmission
  • cooperative sensing
  • outage probability

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