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Using orthogonal designs with feedback in wireless relay networks

Paredes, Javier M ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1109/SPAWC.2008.4641570
  3. Publisher: 2008
  4. Abstract:
  5. Recently, distributed space-time coding over half duplex wireless relay networks has been proposed to achieve higher diversity at the receiver. The use of orthogonal and quasi-orthogonal designs in such relay networks has the advantage of providing maximum diversity at a low decoding complexity. However, similar to their originating space-time codes, these designs are restricted in terms of rate and number of relays. In order to alleviate such restrictions, we propose an extension of group-coherent codes (GCCs) to wireless relay networks. As will be shown, with a very limited amount of feedback from receiver to the relays, it is possible to achieve a distributed code that is applicable for any number of relays without an additional rate loss. In addition, our approach offers the advantages of linear ML decoding complexity, maximum diversity, lower delay, and increased power gain. We further show that it is possible to improve the performance at the price of a higher feedback rate. Finally, the robustness of our scheme against node failures is verified. ©2008 IEEE
  6. Keywords:
  7. Decoding complexity ; Distributed codes ; Distributed space-time coding ; Feedback rates ; Half-duplex ; Low decoding complexity ; Node failure ; Orthogonal design ; Power gains ; Quasi orthogonal design ; Rate loss ; Relay network ; Space time code ; Wireless relay networks ; Decoding ; Relay control systems ; Signal processing ; Wireless telecommunication systems ; Wireless networks
  8. Source: 2008 IEEE 9th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2008, Recife, 6 July 2008 through 9 July 2008 ; October , 2008 , Pages 61-65
  9. URL: https://ieeexplore.ieee.org/document/4641570