Dedicated-relay vs. user cooperation in time-duplexed multiaccess networks

Lalitha Sankar, Gerhard Kramer, Narayan B. Mandayam

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The performance of user cooperation that results when users forward packets for each other in a multiaccess network is compared to that of dedicated-relay cooperation which results from using a dedicated wireless relay when the users do not cooperate. Using the total transmit and processing power consumed at all nodes as a cost metric, the outage probabilities achieved by dynamic decode-and-forward (DDF) and amplify-and-forward (AF) are compared for the two networks. A geometry-inclusive high signal-to-noise ratio (SNR) outage analysis in conjunction with area-averaged numerical simulations shows that in a K-user time-duplexed multiaccess network, user and dedicated-relay cooperation achieve a maximum diversity per user of K and 2, respectively, under both DDF and AF. However, when accounting for energy costs of processing and communication, dedicated-relay cooperation can be more energy efficient than user cooperation, i.e., dedicated-relay cooperation achieves coding (SNR) gains, particularly in the low SNR regime, that override the diversity advantage of user cooperation.

Original languageEnglish (US)
Pages (from-to)330-339
Number of pages10
JournalJournal of Communications
Volume6
Issue number4
DOIs
StatePublished - 2011
Externally publishedYes

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Signal to noise ratio
Outages
Processing
Costs
Geometry
Communication
Computer simulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Dedicated-relay vs. user cooperation in time-duplexed multiaccess networks. / Sankar, Lalitha; Kramer, Gerhard; Mandayam, Narayan B.

In: Journal of Communications, Vol. 6, No. 4, 2011, p. 330-339.

Research output: Contribution to journalArticle

Sankar, Lalitha ; Kramer, Gerhard ; Mandayam, Narayan B. / Dedicated-relay vs. user cooperation in time-duplexed multiaccess networks. In: Journal of Communications. 2011 ; Vol. 6, No. 4. pp. 330-339.
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