Distributed low-overhead schemes for multi-stream MIMO interference channels

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

6 Scopus Citations
View graph of relations

Author(s)

  • Hadi Ghauch
  • Taejoon Kim
  • Mats Bengtsson
  • Mikael Skoglund

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number7018072
Pages (from-to)1737-1749
Journal / PublicationIEEE Transactions on Signal Processing
Volume63
Issue number7
Publication statusPublished - 1 Apr 2015

Abstract

Our aim in this paper is to propose fully distributed schemes for transmit and receive filter optimization. The novelty of the proposed schemes is that they only require a few forward-backward iterations, thus causing minimal communication overhead. For that purpose, we relax the well-known leakage minimization problem, and then propose two different filter update structures to solve the resulting nonconvex problem: though one leads to conventional full-rank filters, the other results in rank-deficient filters, that we exploit to gradually reduce the transmit and receive filter rank, and greatly speed up the convergence. Furthermore, inspired from the decoding of turbo codes, we propose a turbo-like structure to the algorithms, where a separate inner optimization loop is run at each receiver (in addition to the main forward-backward iteration). In that sense, the introduction of this turbo-like structure converts the communication overhead required by conventional methods to computational overhead at each receiver (a cheap resource), allowing us to achieve the desired performance, under a minimal overhead constraint. Finally, we show through comprehensive simulations that both proposed schemes hugely outperform the relevant benchmarks, especially for large system dimensions.

Research Area(s)

  • Distributed algorithms, forward-backward algorithms, interference leakage minimization, iterative weight update, MIMO interference channels, turbo optimization

Citation Format(s)

Distributed low-overhead schemes for multi-stream MIMO interference channels. / Ghauch, Hadi; Kim, Taejoon; Bengtsson, Mats; Skoglund, Mikael.

In: IEEE Transactions on Signal Processing, Vol. 63, No. 7, 7018072, 01.04.2015, p. 1737-1749.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review