On building a cooperative communication system: Testbed implementation and first results

Ashutosh Sabharwal; Patrick Murphy; Behnaam Aazhang

doi:10.1155/2009/972739

On building a cooperative communication system: Testbed implementation and first results

Ashutosh Sabharwal, Patrick Murphy, Behnaam Aazhang

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

32 Scopus citations

Abstract

We present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications link. 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 conventional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative systems to reuse components of current (noncooperative) systems. Our full system implementation shows gains of 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.

Original language	English (US)
Article number	972739
Journal	Eurasip Journal on Wireless Communications and Networking
Volume	2009
DOIs	https://doi.org/10.1155/2009/972739
State	Published - 2009

ASJC Scopus subject areas

Signal Processing
Computer Science Applications
Computer Networks and Communications

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abstract = "We present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications link. 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 conventional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative systems to reuse components of current (noncooperative) systems. Our full system implementation shows gains of 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.",

author = "Ashutosh Sabharwal and Patrick Murphy and Behnaam Aazhang",

note = "Funding Information: The authors would like to thank Dr. Chris Dick at Xilinx and the Xilinx University Program for their continuing support of the WARP project. This work was partially funded by NSF Grants CNS-0325971, CNS-0619767, and CNS-0551692.",

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AB - We present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications link. 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 conventional Alamouti receiver without change for the distributed relay system, thereby allowing cooperative systems to reuse components of current (noncooperative) systems. Our full system implementation shows gains of 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.

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On building a cooperative communication system: Testbed implementation and first results

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