Block diagonalization approach for amplify-and-forward relay systems in MIMO multi-user channels

Jeongho Hwang, Kyoung Jae Lee, Hakjea Sung, Inkyu Lee

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

6 Citations (Scopus)

Abstract

In this paper, we consider a relay system in multipleinput multiple-output (MIMO) multi-user channels where a single MIMO relay is engaged in communication between multiple source-destination terminal pairs. We propose two amplify-and-forward (AF) relaying schemes which maximize the sum-rate for the interference channel with multiple source-destinations. First, we introduce an iterative scheme which provides a local optimal solution. The proposed scheme iteratively searches an optimum relay matrix by deriving the gradient of the sum-rate and applying the gradient descent algorithm. Next, in order to reduce the computational complexity of the iterative scheme, we propose a block diagonalization (BD) method which utilizes the minimum mean-square error (MMSE) criterion with singular value decomposition (SVD) based rate maximization. Simulation results show that the proposed iterative scheme achieves a nearoptimal sum-rate for the given channel model, and the MMSE based BD with the rate maximization approaches the local optimal sum-rate at high signal-to-noise ratio (SNR) regime.

Original languageEnglish
Title of host publicationIEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC
DOIs
Publication statusPublished - 2009 Dec 1
Event2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009 - Tokyo, Japan
Duration: 2009 Sep 132009 Sep 16

Other

Other2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009
CountryJapan
CityTokyo
Period09/9/1309/9/16

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Hwang, J., Lee, K. J., Sung, H., & Lee, I. (2009). Block diagonalization approach for amplify-and-forward relay systems in MIMO multi-user channels. In IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC [5449809] https://doi.org/10.1109/PIMRC.2009.5449809