Distributed block diagonalization with selective zero forcing for multicell MU-MIMO systems

Yo Seb Jeon, Young Jin Kim, Moonsik Min, Gi Hong Im

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

This letter proposes a distributed beamforming scheme based on block diagonalization (BD) for multicell multiuser multiple-input multiple-output (MU-MIMO) downlink systems. Although conventional BD can be directly extended to these systems in a distributed manner, it suffers from sum-rate degradation due to strict zero-forcing (ZF) constraints. To overcome this problem, we introduce a sum-rate maximization problem for BD, to find the optimal selection of ZF constraints. Then we propose a search algorithm to solve the problem in a distributed and heuristic manner. Simulation results show that the proposed scheme effectively finds a near-optimal solution and significantly improves simple extended BD such that it can provide higher sum rate than the conventional schemes.

Original languageEnglish
Article number6766216
Pages (from-to)605-609
Number of pages5
JournalIEEE Signal Processing Letters
Volume21
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • Coordinated beamforming
  • Distributed beamforming
  • Inter-cell interference

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