Hybrid Precoding with Time-Modulated Arrays for mmWave MIMO Systems
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Date
2018
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Publisher
IEEE
Abstract
We consider the utilization of Time-Modulated Arrays (TMAs) as a simple and cost-effective
approach to hybrid digital-analog precoding in millimeter wave (mmWave) Multiple-Input Multiple-Output
(MIMO) systems. Instead of conventional Variable Phase Shifters (VPSs), our proposed TMA hybrid
precoders use Radio Frequency (RF) switches followed by 1-bit VPSs in the analog part. We study the
insertion losses at mmWave of a TMA Analog Precoding Network (APN) in terms of Sideband Radiation
(SR) and hardware efficiency. In addition, we present different algorithms for the design of both the
baseband and RF parts of a TMA hybrid precoder. The proposed methods exhibit different trade-offs
between performance, complexity, and power efficiency. Finally, TMA precoders are compared to those
implemented with conventional VPSs in terms of insertion losses, chip area and cost, concluding that
precoding with TMAs is a competitive solution for mmWave MIMO systems.