Power Efficient Scheduling and Hybrid Precoding for Time Modulated Arrays
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Date
2020
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Publisher
IEEE
Abstract
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.