Experimental investigation of cooperative schemes on a real-time DSP-based testbed
EURASIP Journal on Wireless Communications and Networking - Special issue on cooperative communications in wireless networks
Implementation and evaluation of cooperative communication schemes in software-defined radio testbed
INFOCOM'10 Proceedings of the 29th conference on Information communications
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
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In this paper we describe the implementation of a spread spectrum based cooperative relaying on an FPGA platform. We focus on a network comprising one source, one or more relays, and one destination. Once the source's message is received by the relays, the relays simultaneously transmit the information to the destination. In order to avoid interference between the various relay transmissions, each relay node spreads its information using a unique spreading code chosen from a set of sequences with good cross-correlation and autocorrelation properties. These properties allow separation of the signals in the presence of frequency and timing offsets between the various transmissions. This platform is tested through an audio application using a commercially available RF front end. The platform not only enables testing of cooperative communications, but also other related concepts relying on software-defined radio such as Cognitive Radio.