Selective water-filling for decode-and-forward cooperative systems

S. H. Song, Q. T. Zhang, Khaled Letaief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Consider a decode-and-forward (DF) based cooperative system where a multi-antenna base-station (source) transmits information to a single-antenna destination (D) with the help of multiple single-antenna relays ({R i}). The optimal transmit weighting vector at the source is not available in the literature due to the non-linear DF operation, which causes the problem non-convex. By investigating the single-relay system, we show that the optimal transmit vector for the single-relay system can be determined by comparing the S-D beamformer (maximum-ratio-transmit beamforming vector for the S-D link) with the one that utilizes "just sufficient" energy to activate the relay-link. This idea is then applied to the multi-relay system to propose a selective water-filling algorithm, where the optimal solution is obtained by comparing the S-D beamformer with schemes that selectively activate different combinations of relay-links.

Original languageEnglish
Title of host publication2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
Pages409-413
Number of pages5
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012 - Cesme, Turkey
Duration: 17 Jun 201220 Jun 2012

Other

Other2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012
CountryTurkey
CityCesme
Period17/6/1220/6/12

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Keywords

  • Cooperative system
  • decode-and-forward
  • selective water-filling

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Information Systems

Cite this

Song, S. H., Zhang, Q. T., & Letaief, K. (2012). Selective water-filling for decode-and-forward cooperative systems. In 2012 IEEE 13th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2012 (pp. 409-413). [6292938] https://doi.org/10.1109/SPAWC.2012.6292938