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

Authors:
Patrick Murphy;Ashutosh Sabharwal;Behnaam Aazhang
Affiliations:
Department of Electrical and Computer Engineering, Rice University, Houston, TX;Department of Electrical and Computer Engineering, Rice University, Houston, TX;Department of Electrical and Computer Engineering, Rice University, Houston, TX
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on cooperative communications in wireless networks
Year:
2009

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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 systemimplementation shows gains of up to 5.5 dB 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.