Abstract

Abstract Summary: Reducing EMF Exposure in Multi-Antenna Systems

Overview

Wireless personal devices (WPDs) have advanced significantly with the introduction of multi-input multi-output (MIMO) communication since the fourth generation (4G) of cellular systems. The implications of MIMO communications on user EMF exposure levels have been under critical examination to optimize and reduce potential health risks.

Findings

• Development of a generic model to assess exposure doses in multi-user, multi-antenna, multi-carrier systems.
• Introduction of an optimization framework aimed at minimizing EMF exposure, highlighting the importance of the ratio between the normalized exposure dose and the channel to noise ratio (CNR).
• Proposition of two innovative centralized resource allocation schemes designed to decrease EMF exposure significantly using the capabilities of multiple antennas.

Conclusion

The newly developed schemes can reduce the EMF exposure of WPD users by about 80% compared to existing approaches. Further, the study illuminates the logarithmic relationship between exposure dose and the number of receive antennas or time slots, presenting a strategic avenue to further mitigate exposure while improving system efficiency.