Power Efficient Scheduling and Hybrid Precoding for Time Modulated Arrays

We consider power efficient scheduling and precoding solutions for multiantenna hybrid digital-analog transmission systems that use Time-Modulated Arrays (TMAs) in the analog domain. TMAs perform beamforming with switches instead of conventional Phase Shifters (PSs). The extremely low insertion loss...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.21063-21076
Main Authors: Gonzalez-Coma, Jose P., Castedo, Luis
Format: Article
Language:English
Subjects:
Algorithms
Antenna arrays
Arrays
Beamforming
Computational geometry
Convexity
Digital-analog conversion
Harmonic analysis
Hybrid power systems
hybrid precoding
Hybrid systems
Insertion loss
massive MIMO
Millimeter waves
MIMO (control systems)
mmWave
New technology
Optimization
Phase shifters
Power consumption
Power efficiency
Power management
Precoding
Radio frequency
Scheduling
Switches
Time modulated array
user scheduling
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Summary:We consider power efficient scheduling and precoding solutions for multiantenna hybrid digital-analog transmission systems that use Time-Modulated Arrays (TMAs) in the analog domain. TMAs perform beamforming with switches instead of conventional Phase Shifters (PSs). The extremely low insertion losses of switches, together with their reduced power consumption and cost make TMAs attractive in emerging technologies like massive Multiple-Input Multiple-Output (MIMO) and millimeter wave (mmWave) systems. We propose a novel analog processing network based on TMAs and provide an angular scheduling algorithm that overcomes the limitations of conventional approaches. Next, we pose a convex optimization problem to determine the analog precoder. This formulation allows us to account for the Sideband Radiation (SR) effect inherent to TMAs, and achieve remarkable power efficiencies with a very low impact on performance. Computer experiments results show that the proposed design, while presenting a significantly better power efficiency, achieves a throughput similar to that obtained with other strategies based on angular selection for conventional architectures.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2968572