Coordinated beamforming with relaxed zero forcing

G. Lee, J. Park, Y. Sung, Masahiro Yukawa

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

9 Citations (Scopus)

Abstract

In this paper, a new beam design paradigm for coordinated beamforming (CB) for current and future cellular networks is proposed based on a relaxed zero-forcing (RZF) constraint. In the conventional zero-forcing (ZF) CB, each cooperating transmitter designs its transmit beamforming matrix to null out interference to undesired receivers completely. In the proposed RZF paradigm, however, the ZF constraint is relaxed so that a tolerable amount of interference leakage to undesired receivers is allowed for the beam design at each transmitter. By relaxing the ZF constraint in such a way, transmitters have more degrees of freedom for their beam design to increase the overall data rate of the network. An efficient algorithm for the RZFCB is proposed based on a projected subgradient method. Numerical results show that the proposed RZFCB shows a noticeable gain over the conventional ZFCB.

Original languageEnglish
Title of host publication2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 - Nanjing, China
Duration: 2011 Nov 92011 Nov 11

Other

Other2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011
CountryChina
CityNanjing
Period11/11/911/11/11

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Keywords

  • Coordinated beamforming
  • Interference channel
  • MIMO system
  • Projected subgradient method
  • Zero-forcing

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing

Cite this

Lee, G., Park, J., Sung, Y., & Yukawa, M. (2011). Coordinated beamforming with relaxed zero forcing. In 2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 [6096925] https://doi.org/10.1109/WCSP.2011.6096925