Article (Scientific journals)
Coordinated Multicell Multiuser Precoding for Maximizing Weighted Sum Energy Efficiency
He, Shiwen; Huang, Yongming; Yang, Luxi et al.
2014In IEEE Transactions on Signal Processing, 62 (3), p. 741-751
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Keywords :
Coordinated multicell precoding; energy efficient optimization; sum rate maximization; weighted sum energy efficiency maximization
Abstract :
[en] Energy efficiency optimization of wireless systems has become urgently important due to its impact on the global carbon footprint. In this paper we investigate energy efficient multicell multiuser precoding design and consider a new criterion of weighted sum energy efficiency, which is defined as the weighted sum of the energy efficiencies of multiple cells. This objective is more general than the existing methods and can satisfy heterogeneous requirements from different kinds of cells, but it is hard to tackle due to its sum-of-ratio form. In order to address this non-convex problem, the user rate is first formulated as a polynomial optimization problem with the test conditional probabilities to be optimized. Based on that, the sum-of-ratio form of the energy efficient precoding problem is transformed into a parameterized polynomial form optimization problem, by which a solution in closed form is achieved through a two-layer optimization. We also show that the proposed iterative algorithm is guaranteed to converge. Numerical results are finally provided to confirm the effectiveness of our energy efficient beamforming algorithm. It is observed that in the low signal-to-noise ratio (SNR) region, the optimal energy efficiency and the optimal sum rate are simultaneously achieved by our algorithm; while in the middle-high SNR region, a certain performance loss in terms of the sum rate is suffered to guarantee the weighed sum energy efficiency.
Disciplines :
Computer science
Author, co-author :
He, Shiwen
Huang, Yongming
Yang, Luxi
OTTERSTEN, Björn  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Language :
English
Title :
Coordinated Multicell Multiuser Precoding for Maximizing Weighted Sum Energy Efficiency
Publication date :
2014
Journal title :
IEEE Transactions on Signal Processing
ISSN :
1053-587X
Publisher :
IEEE
Volume :
62
Issue :
3
Pages :
741-751
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
EU, FP7, Seventh Framework Programme
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