Compute-and-Forward on a Multiaccess Relay Channel: Coding and Symmetric-Rate Optimization

Abstract : We consider a system in which two users communicate with a destination with the help of a half-duplex relay. Based on the compute-and-forward scheme, we develop and evaluate the performance of coding strategies that are of network coding spirit. In this framework, instead of decoding the users' information messages, the destination decodes two integer-valued linear combinations that relate the transmitted codewords. Two decoding schemes are considered. In the first one, the relay computes one of the linear combinations and then forwards it to the destination. The destination computes the other linear combination based on the direct transmissions. In the second one, accounting for the side information available at the destination through the direct links, the relay compresses what it gets using Wyner-Ziv compression and conveys it to the destination. The destination then computes the two linear combinations, locally. For both coding schemes, we discuss the design criteria, and derive the allowed sum-rate. Next, we address the power allocation and the selection of the integer-valued coefficients to maximize the offered sum-rate; an iterative coordinate descent method is proposed. The analysis shows that our coding schemes can offer substantial gains over standard relaying techniques. The results are illustrated through some numerical examples.
Type de document :
Article dans une revue
IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers, 2013


https://hal.archives-ouvertes.fr/hal-00793710
Contributeur : Abdellatif Zaidi <>
Soumis le : vendredi 22 février 2013 - 18:39:19
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

Identifiants

  • HAL Id : hal-00793710, version 1
  • ARXIV : 1209.4483

Citation

Mohieddine El Soussi, Abdellatif Zaidi, Luc Vandendorpe. Compute-and-Forward on a Multiaccess Relay Channel: Coding and Symmetric-Rate Optimization. IEEE Transactions on Wireless Communications, Institute of Electrical and Electronics Engineers, 2013. <hal-00793710>

Partager

Métriques

Consultations de la notice

150