Cooperative decode-and-forward relaying for secondary spectrum access

Yang Han; Ashish Pandharipande; See Ho Ting

doi:10.1109/TWC.2009.081484

Cooperative decode-and-forward relaying for secondary spectrum access

Yang Han
, Ashish Pandharipande
, See Ho Ting

Research output: Contribution to journal › Article › Academic › peer-review

338 Citations (Scopus)

Abstract

We propose a two-phase protocol based on cooperative decode-and-forward relaying for a secondary system to achieve spectrum access along with a primary system. The primary and secondary systems comprise of a transmitter-receiver pair, PT-PR and ST-SR, respectively. In the first transmission phase, PT transmits the primary signal to PR, which is also received by ST and SR, where it is decoded. At ST, the primary signal is regenerated and linearly combined with the secondary signal by assigning fractions and (1) of the available power to the primary and secondary signals respectively. This combined signal is then broadcasted by ST in the second transmission phase. We show that as long as ST is located within a critical radius from PT, there exists a threshold value for above which the outage probability of the primary system will be equal to or lower than the case without spectrum sharing. We also determine the outage probability achieved by the secondary system. Theoretical and simulation results confirm the efficiency of the proposed spectrum sharing scheme.

Original language	English
Article number	5288926
Pages (from-to)	4945-4950
Number of pages	6
Journal	IEEE Transactions on Wireless Communications
Volume	8
Issue number	10
DOIs	https://doi.org/10.1109/TWC.2009.081484
Publication status	Published - Oct 2009
Externally published	Yes

Funding

Manuscript received November 7, 2008; revised March 9, 2009 and May 12, 2009; accepted July 13, 2009. The associate editor coordinating the review of this letter and approving it for publication was I.-M. Kim. Y. Han and S. H. Ting are with the School of Electrical and Electronic Engineering, Nanyang Technological University, 639798 Singapore (e-mail: {hany0008, shting}@ntu.edu.sg). A. Pandharipande is with Philips Research Europe - Eindhoven, High Tech Campus, 5656AE Eindhoven, The Netherlands (e-mail: [email protected]). S. H. Ting is partly supported by the Singapore Ministry of Education Academic Research Fund Tier 1, RG74/07. Digital Object Identifier 10.1109/TWC.2009.081484

Keywords

Cognitive radios
Cooperative transmission
Decode-and-forward relaying
Spectrum sharing

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10.1109/TWC.2009.081484

Cite this

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AB - We propose a two-phase protocol based on cooperative decode-and-forward relaying for a secondary system to achieve spectrum access along with a primary system. The primary and secondary systems comprise of a transmitter-receiver pair, PT-PR and ST-SR, respectively. In the first transmission phase, PT transmits the primary signal to PR, which is also received by ST and SR, where it is decoded. At ST, the primary signal is regenerated and linearly combined with the secondary signal by assigning fractions and (1) of the available power to the primary and secondary signals respectively. This combined signal is then broadcasted by ST in the second transmission phase. We show that as long as ST is located within a critical radius from PT, there exists a threshold value for above which the outage probability of the primary system will be equal to or lower than the case without spectrum sharing. We also determine the outage probability achieved by the secondary system. Theoretical and simulation results confirm the efficiency of the proposed spectrum sharing scheme.

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Cooperative decode-and-forward relaying for secondary spectrum access

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Keywords

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