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Position-Based Adaptive Power Back-Off for User Electromagnetic Exposure Management in Millimeter Wave Systems | IEEE Journals & Magazine | IEEE Xplore

Position-Based Adaptive Power Back-Off for User Electromagnetic Exposure Management in Millimeter Wave Systems


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 t...Show More

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.
Published in: IEEE Wireless Communications Letters ( Volume: 11, Issue: 1, January 2022)
Page(s): 86 - 90
Date of Publication: 19 October 2021

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