User-Exposure-Cancelling Beamforming for Multi-Antenna Systems

Wireless communication systems operating in close proximity to the human body are subject to user electromagnetic absorption regulations. Complying with electromagnetic exposure thresholds will become increasingly difficult as portable devices are equipped with more radios and multiple antennas. Despite these issues, there has been a limited amount of research on the design and analysis of transmission methods incorporating exposure constraints. To address this, we propose a beamforming scheme that leverages existing exposure models for multi-antenna systems to design low-exposure beams which achieve high receive signal-to-noise ratio (SNR). We demonstrate that in exposure-constrained systems, our proposed scheme outperforms traditional power reduction methods.