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  • Research Article
  • Open Access

Link-Adaptive Distributed Coding for Multisource Cooperation

  • 1,
  • 1,
  • 1 and
  • 1Email author
EURASIP Journal on Advances in Signal Processing20072008:352796

https://doi.org/10.1155/2008/352796

  • Received: 14 May 2007
  • Accepted: 7 September 2007
  • Published:

Abstract

Combining multisource cooperation and link-adaptive regenerative techniques, a novel protocol is developed capable of achieving diversity order up to the number of cooperating users and large coding gains. The approach relies on a two-phase protocol. In Phase 1, cooperating sources exchange information-bearing blocks, while in Phase 2, they transmit reencoded versions of the original blocks. Different from existing approaches, participation in the second phase does not require correct decoding of Phase 1 packets. This allows relaying of soft information to the destination, thus increasing coding gains while retaining diversity properties. For any reencoding function the diversity order is expressed as a function of the rank properties of the distributed coding strategy employed. This result is analogous to the diversity properties of colocated multi-antenna systems. Particular cases include repetition coding, distributed complex field coding (DCFC), distributed space-time coding, and distributed error-control coding. Rate, diversity, complexity and synchronization issues are elaborated. DCFC emerges as an attractive choice because it offers high-rate, full spatial diversity, and relaxed synchronization requirements. Simulations confirm analytically established assessments.

Keywords

  • Diversity Property
  • Diversity Order
  • Soft Information
  • Code Gain
  • Repetition Code

Publisher note

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Authors’ Affiliations

(1)
Department of Electrical and Computer Engineering, University of Minnesota, 200 Union Street, Minneapolis, MN 55455, USA

Copyright

© Alfonso Cano et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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