On Diversity of Cooperative Relaying Protocols

Satya Prakash Ponnaluri; Stephen G. Wilson

2nd International ICST Conference on Communications and Networking in China

Research Article

On Diversity of Cooperative Relaying Protocols

Cite: BibTeX Plain Text

@INPROCEEDINGS{10.1109/CHINACOM.2007.4469343,
    author={Satya Prakash Ponnaluri and Stephen G. Wilson},
    title={On Diversity of Cooperative Relaying Protocols},
    proceedings={2nd International ICST Conference on Communications and Networking in China},
    publisher={IEEE},
    proceedings_a={CHINACOM},
    year={2008},
    month={3},
    keywords={Channel state information  Decoding  Fading  Particle measurements  Performance gain  Protocols  Radio frequency  Rayleigh channels  Relays  Throughput},
    doi={10.1109/CHINACOM.2007.4469343}
}

Satya Prakash Ponnaluri
Stephen G. Wilson
Year: 2008
On Diversity of Cooperative Relaying Protocols
CHINACOM
IEEE
DOI: 10.1109/CHINACOM.2007.4469343

Satya Prakash Ponnaluri¹^,*, Stephen G. Wilson²^,*

1: Charles L. Brown Dept. of E.C.E,University of Virginia Charlottesville, VA 22904-4743
2: Charles L. Brown Dept. of E.C.E, University of Virginia Charlottesville, VA 22904-4743

*Contact email: satya@virginia.edu, sgw@virginia.edu

Abstract

We focus on the achievable diversity order and probability of error performance in an uncoded cooperative relaying scenario with multiple relays when the destination has no knowledge of the channel gains corresponding to the source to relay links. We consider a hard-decision adaptive decode-andforward protocol wherein each relay transmits only if its received signal strength is above a threshold. For such a protocol we show that by allowing the threshold to change with the average SNR, the achievable diversity order can be made arbitrarily close to the spatial diversity available. We also analyze a pure amplifyand- forward protocol and show via numerical results that the achievable diversity order is close to 1 as opposed to 3 when there are two participating relays. By choosing a threshold that varies with the average SNR, it is observed that the adaptive decodeand- forward protocol significantly outperforms the amplify-andforward and decode-and-forward protocols.

Keywords: Channel state information Decoding Fading Particle measurements Performance gain Protocols Radio frequency Rayleigh channels Relays Throughput

Published: 2008-03-07
Publisher: IEEE
Modified: 2011-07-18

: http://dx.doi.org/10.1109/CHINACOM.2007.4469343