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Definition and performance analysis of new cooperative protocols

Abstract : In cooperative networks, multiple nodes cooperate to form a virtual antenna array and exploit space-time diversity. The relay channel is first investigated. In order to improve performance at low SNRs, an adaptive strategy is proposed for both amplify-and-forward (AF) and decode-and-forward (DF) protocols. This strategy chooses the best transmission scheme in term of mutual information for each channel realization. To define an easily implementable and efficient DF protocol, we propose to use an incomplete decoding at relays. This technique provides both full rate and full diversity. Its DMT is similar to the one of the well-known non-orthogonal AF (NAF). In order to reduce the decoding complexity at relays, we also propose two decoding methods based on the space-time block code (STBC) structure and diophantine approximation, respectively. When several sources need to transmit simultaneously, a cooperative multiple access (CMA) channel has to be considered. A practical implementation and two modifications of the CMA-NAF protocol defined by Azarian et al. are proposed, as well as a DF variant, the CMA-IDF. These protocols provide better asymptotic performance and their DMT is closer to the MISO bound. Finally, if the direct link between source and destination is nonexistent or experiences too much fading, a multihop strategy has to be used. In this thesis, a protocol is proposed for the K-parallel-path (KPP) network, based on path selection combined with a small STBC. This protocol achieves the optimal DMT of the KPP channel with a limited complexity.
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Contributor : Charlotte Hucher Connect in order to contact the contributor
Submitted on : Wednesday, March 28, 2012 - 2:52:26 PM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Wednesday, December 14, 2016 - 6:26:07 PM


  • HAL Id : pastel-00683338, version 1


Charlotte Hucher. Definition and performance analysis of new cooperative protocols. Networking and Internet Architecture [cs.NI]. Télécom ParisTech, 2009. English. ⟨pastel-00683338⟩



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