Approximation algorithms for indefinite complex quadratic maximization problems

Yong wei Huang; Shuzhong Zhang

doi:10.1007/s11425-010-3087-7

Approximation algorithms for indefinite complex quadratic maximization problems

Yong wei Huang, Shuzhong Zhang

Industrial and Systems Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

In this paper, we consider the following indefinite complex quadratic maximization problem: maximize z^HQ_z, subject to z_k ∈ ℂ and z_k^m = 1, k = 1,...,n, where Q is a Hermitian matrix with tr Q = 0, z ∈ ℂⁿ is the decision vector, and m ≥ 3. An Ω(1/log n) approximation algorithm is presented for such problem. Furthermore, we consider the above problem where the objective matrix Q is in bilinear form, in which case a 0.7118(cos Π/m)² approximation algorithm can be constructed. In the context of quadratic optimization, various extensions and connections of the model are discussed.

Original language	English (US)
Pages (from-to)	2697-2708
Number of pages	12
Journal	Science China Mathematics
Volume	53
Issue number	10
DOIs	https://doi.org/10.1007/s11425-010-3087-7
State	Published - 2010

Bibliographical note

Funding Information:
Acknowledgements Research by the second author was supported by Hong Kong RGC Earmarked Grant (Grant No. CUHK418406) and National Natural Science Foundation of China (Grant No. 10771133). Part of the first author’s work was done when he was in Department of Systems Engineering and Engineering Management, The Chinese University of Hong Kong.

Keywords

approximation ratio
indefinite Hermitian matrix
randomized algorithms
semidefinite programming relaxation

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abstract = "In this paper, we consider the following indefinite complex quadratic maximization problem: maximize zHQz, subject to zk ∈ ℂ and zkm = 1, k = 1,...,n, where Q is a Hermitian matrix with tr Q = 0, z ∈ ℂn is the decision vector, and m ≥ 3. An Ω(1/log n) approximation algorithm is presented for such problem. Furthermore, we consider the above problem where the objective matrix Q is in bilinear form, in which case a 0.7118(cos Π/m)2 approximation algorithm can be constructed. In the context of quadratic optimization, various extensions and connections of the model are discussed.",

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Approximation algorithms for indefinite complex quadratic maximization problems

Abstract

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