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  • Research Article
  • Open Access

Delay Optimization in Cooperative Relaying with Cyclic Delay Diversity

EURASIP Journal on Advances in Signal Processing20082008:736818

  • Received: 1 November 2007
  • Accepted: 5 March 2008
  • Published:


Cooperative relaying has recently been recognized as an alternative to MIMO in a typical multicellular environment. Inserting random delays at the nonregenerative fixed relays further improve the system performance. However, random delays result in limited performance gain from multipath diversity. In this paper, two promising delay optimization schemes are introduced for a multicellular OFDM system with cooperative relaying with stationary multiple users and fixed relays. Both of the schemes basically aim to take the most advantages of the potential frequency selectivity by inserting predetermined delays at the relays, in order to further improve the system performance (coverage and throughput). Evaluation results for different multipath fading environments show that the system performance with delay optimization increases tremendously compared with the case of random delay.


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Authors’ Affiliations

Radio Communication Systems, Department of Communication Systems, The Royal Institute of Technology (KTH), Electrum 418, 164 40, KISTA, Sweden


© Slimane Ben Slimane 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.