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- W2771871659 abstract "We consider optimization problems with nonconvex magnitude constraints on frequency or angular responses encountered in many signal processing problems. To provide a solution to these nonconvex problems, an alternating direction method of multipliers based solution framework is developed in this paper. We apply variable splitting to introduce auxiliary two-element vector variables for each frequency or angular response corresponding to each magnitude constraint. In doing so, this class of problems can be solved in an alternate manner, namely, iteratively tackling two subproblems with respect to the original and introduced parameters. Each new constraint may act on only the corresponding two-element vector variables rather than all of them. The subproblem is also simplified such that it is a function of only one parameter, and we prove the convexity of the resultant single-variable piecewise optimization problem. Finally, the effectiveness of the proposed approach is demonstrated via its successful applications to array pattern synthesis, waveform design and robust beamforming." @default.
- W2771871659 created "2017-12-22" @default.
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- W2771871659 date "2018-04-01" @default.
- W2771871659 modified "2023-10-10" @default.
- W2771871659 title "On optimizations with magnitude constraints on frequency or angular responses" @default.
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- W2771871659 doi "https://doi.org/10.1016/j.sigpro.2017.12.009" @default.
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