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Challenges of Digitally Modulated Transmitter Implementation at Millimeter Waves

  • Khaled Khalaf
  • Steven Brebels
  • Piet WambacqEmail author
Chapter

Abstract

Wireless communication is shifting to the millimeter wave frequencies, driven by large bandwidths and accelerated by the discussions on 5G. Phased arrays with multiple front-ends and antennas are inevitable to overcome signal losses, emphasizing the need for low-power solutions. An overview of several analog and digitally modulated transmitter architectures and implementations at millimeter waves is presented. Digital implementations have a potential to save the transmitter power consumption as they allow the power amplifier to operate in saturation. The reduced combination efficiency and complex calibration in digital I-Q architectures risk its power saving advantage. On the other hand, front-ends in digital polar architectures can be highly efficient. Despite having a higher bandwidth baseband and more complex digital processing, high-efficiency front-ends in digital polar architectures are closer to show a power consumption advantage in phased arrays, where the front-end contribution dominates.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.imecLeuvenBelgium
  2. 2.Department of Electronics and Informatics (ETRO)Vrije Universiteit Brussel (VUB)BrusselsBelgium

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