Distributed beamforming techniques for weighted sum-rate maximization in MISO interfering broadcast channels

Hyun Joo Choi, Seok Hwan Park, Sang Rim Lee, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


In this letter, we study a linear beamforming technique for weighted sum-rate (WSR) maximization in multiple-input single-output interfering broadcast channels. We focus on a distributed beamforming scheme which utilizes local channel state information (CSI) to mitigate inter-cell interference. In order to decouple the WSR maximization problem which involves the beamforming vectors of all base stations (BSs) into a distributed WSR problem as a function of local CSI, we apply high signal-to-interference-plus-noise ratio approximation. After defining the distributed WSR function, we solve the decoupled problems by using a zero-gradient based algorithm which converges to a local optimal point. Unlike conventional distributed schemes where additional information should be exchanged at each iteration, each BS of the proposed scheme utilizes only the local CSI to compute its beamforming vectors. Also we prove the convergence of the proposed algorithm. Simulation results show that our proposed algorithm exhibits the WSR performance almost identical to the centralized scheme with substantially reduced overhead.

Original languageEnglish
Article number6153325
Pages (from-to)1314-1320
Number of pages7
JournalIEEE Transactions on Wireless Communications
Issue number4
Publication statusPublished - 2012 Apr

Bibliographical note

Funding Information:
Manuscript received August 17, 2011; revised November 16, 2011; accepted January 9, 2012. The associate editor coordinating the review of this paper and approving it for publication was M. McKay. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0017909). H.-J. Choi, S.-R. Lee, and I. Lee are with the School of Electrical Engineering, Korea University, Seoul, Korea (e-mail: {wisetree, sangrim78, inkyu}@korea.ac.kr). S.-H. Park is with the New Jersey Institute of Technology, Newark, NJ (e-mail: psk1501@korea.ac.kr). Digital Object Identifier 10.1109/TWC.2012.021412.111551


  • Beamforming technique
  • interfering broadcast channels
  • weighted sum-rate

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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