Cooperative diversity in wireless networks: efficient protocols and outage behavior

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Cooperative diversity in wireless networks: efficient protocols and outage behavior (2004)

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by J. Nicholas Laneman , David N. C. Tse , Gregory W. Wornell

Venue:	IEEE TRANS. INFORM. THEORY
Citations:	2008 - 31 self

BibTeX

@ARTICLE{Laneman04cooperativediversity,
    author = {J. Nicholas Laneman and David N. C. Tse and Gregory W. Wornell},
    title = {Cooperative diversity in wireless networks: efficient protocols and outage behavior},
    journal = {IEEE TRANS. INFORM. THEORY},
    year = {2004},
    volume = {50},
    pages = {3062--3080}
}

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Abstract

We develop and analyze low-complexity cooperative diversity protocols that combat fading induced by multipath propagation in wireless networks. The underlying techniques exploit space diversity available through cooperating terminals’ relaying signals for one another. We outline several strategies employed by the cooperating radios, including fixed relaying schemes such as amplify-and-forward and decode-and-forward, selection relaying schemes that adapt based upon channel measurements between the cooperating terminals, and incremental relaying schemes that adapt based upon limited feedback from the destination terminal. We develop performance characterizations in terms of outage events and associated outage probabilities, which measure robustness of the transmissions to fading, focusing on the high signal-to-noise ratio (SNR) regime. Except for fixed decode-and-forward, all of our cooperative diversity protocols are efficient in the sense that they achieve full diversity (i.e., second-order diversity in the case of two terminals), and, moreover, are close to optimum (within 1.5 dB) in certain regimes. Thus, using distributed antennas, we can provide the powerful benefits of space diversity without need for physical arrays, though at a loss of spectral efficiency due to half-duplex operation and possibly at the cost of additional receive hardware. Applicable to any wireless setting, including cellular or ad hoc networks—wherever space constraints preclude the use of physical arrays—the performance characterizations reveal that large power or energy savings result from the use of these protocols.

Keyphrases

wireless network cooperative diversity outage behavior efficient protocol performance characterization outage probability physical array user cooperation powerful benefit space constraint multipath propagation measure robustness ad hoc network fixed decode-and-forward certain regime channel measurement index term diversity technique low-complexity cooperative diversity relay channel cooperating terminal large power high signal-to-noise ratio second-order diversity several strategy cooperative diversity protocol full diversity additional receive hardware half-duplex operation space diversity spectral efficiency energy saving destination terminal limited feedback outage event incremental relaying scheme combat fading technique exploit space diversity wireless setting

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