Optimum discrete transmit beamformer design

Date

2015-01-01

Author

DEMİR, ÖZLEM TUĞFE
Tuncer, Temel Engin

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In this paper, transmit beamformer design problem is considered for single group multicast case. This problem is treated in discrete phase and amplitude and converted to a linear form. The solution of this linear optimization problem is always feasible as long as the total transmit power is above a certain value. The proposed method is guaranteed to find the optimum solution. This new approach is used to design discrete phase-only (DPOB) and discrete phase-amplitude beamformers (DPAB). It is shown that the proposed technique returns even better beamformers compared to its continuous counterparts with significantly improved computational complexity in comparison to brute force approach. When the channel state information (CSI) is partly available, robust beamformers should be used. In this paper, robust DPOB (RDPOB) and robust DPAB (RDPAB) are proposed for this purpose. It is shown that robust discrete beamformers generate better performance improvement compared to its robust continuous beamformers. Several experiments are done in order to show both the performance gain and computational complexity of the proposed techniques.

Subject Keywords

Transmit beamformer, Discrete beamformer, Phase-only beamformer, Mixed integer linear programming, Per-antenna power

URI

https://hdl.handle.net/11511/33187

Journal

DIGITAL SIGNAL PROCESSING

DOI

https://doi.org/10.1016/j.dsp.2014.09.018

Collections

Department of Electrical and Electronics Engineering, Article

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Optimization techniques for nonconvex problems and optimum discrete transmit beamformer design / Demir, Özlem Tuğfe; Tuncer, Temel Engin; Department of Electrical and Electronics Engineering (2014) In this thesis, transmit beamformer design is investigated for single group multicast scenario. The problem is considered for both discrete and continuous case. The discrete problem is converted to a linear form in which there are both discrete and continuous variables. The resulting mixed integer linear programming problem is optimally solved with much lower computational complexity than brute force search. For practical reasons, robust version of the problem is also elaborated and solved with mixed intege...

Citation Formats

Ö. T. DEMİR and T. E. Tuncer, “Optimum discrete transmit beamformer design,” DIGITAL SIGNAL PROCESSING, pp. 57–68, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33187.