wiki:BuildingCooperativeComm

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On Building a Cooperative Communication System: Testbed Implementation and First Results

Authors: Patrick Murphy, Ashutosh Sabharwal & Behnaam Aazhaing

Abstract

In this paper, we present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications system. Our custom OFDM-based physical layer uses a distributed version of the Alamouti block code, where the relay sends one of the branches of Alamouti encoded symbols. First we show analytically and experimentally that amplify and forward protocols are unaffected by carrier frequency offsets at the relay. This result allows us to use a conven- tional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative systems to reuse components of current (non-cooperative) systems. Our full system implementation shows gains up to 5.5dB in peak power constrained networks. Thus, we can conclusively state that even the simplest form of relaying can lead to significant gains in practical implementations.

Preprint

On Building a Cooperative Communication System: Testbed Implementation and First Results (PDF 500KB)

Preprint from Hindawi/EURASIP JWCN

Citation

@preprint{RiceCooperativeComm:2009,
	Author = {P. Murphy, A. Sabharwal and B. Aazhang},
	Title = {On Building a Cooperative Communication System: Testbed Implementation and First Results},
	Journal = {EURASIP Journal on Wireless Communications and Networking}
	Month = {June},
	Year = {2009}}

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