NDLI: On the complexity of optimal coordinated downlink beamforming

Content Provider	IEEE Xplore Digital Library
Author	Ya-Feng Liu Yu-Hong Dai Zhi-Quan Luo
Copyright Year	2010
Description	Author affiliation: State Key Lab. of Scientific and Engineering Computing, Chinese Academy of Sciences, Beijing, 100190, China (Ya-Feng Liu; Yu-Hong Dai) \|\| Dept. of ECE, University of Minnesota, Minneapolis, 55455, USA (Zhi-Quan Luo)
Abstract	In a cellular wireless system, users located at cell edges often suffer significant out-of-cell interference. In this paper we consider a coordinated beamforming approach whereby multiple base stations jointly optimize their downlink beamforming vectors in order to simultaneously improve the data rates of a given group of cell edge users. Assuming perfect channel knowledge, we formulate this problem as the maximization of a system utility function (which balances user fairness and average user rates), subject to individual power constraints at each base station. We show that, for the single carrier case and when the number of antennas at each base station is at least two, the optimal coordinated beamforming problem is strongly NP-hard for both the harmonic mean utility function and the proportional fairness utility function. For the min-rate utility function, we show that the problem is solvable in polynomial time.
Starting Page	3274
Ending Page	3277
File Size	105584
Page Count	4
File Format	PDF
ISBN	9781424442959
ISSN	15206149
DOI	10.1109/ICASSP.2010.5496027
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-03-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Downlink Array signal processing Base stations Polynomials Signal processing Interference channels Signal to noise ratio Transmitters Transmitting antennas Wireless cellular systems
Content Type	Text
Resource Type	Article

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