Position-Based Adaptive Power Back-off for User Electromagnetic Exposure Management in Millimeter Wave Systems Articles uri icon

publication date

  • October 2021

start page

  • 86

end page

  • 90

issue

  • 1

volume

  • 11

International Standard Serial Number (ISSN)

  • 1089-7798

Electronic International Standard Serial Number (EISSN)

  • 1558-2558

abstract

  • Mobile devices are subject to regulatory limits on user electromagnetic radiation exposure. User exposure is dynamic and varies as a function of the transmit signal and the device orientation. In this letter, we propose the use of a signal-level power density (PD) model to adaptively reduce the transmit power of a millimeter wave (mmWave) system as the position of the device changes. We also develop a method for efficiently calculating power back-off factors for beams in a discrete Fourier Transform (DFT) codebook. Simulation results demonstrate that position-based power reduction leads to a significant performance improvement.

subjects

  • Telecommunications

keywords

  • millimeter wave communication; electromagnetic exposure; power density (pd); adaptive power back-off; dft codebook