Comparison of human EM-exposure in fifth generation wireless technologies : ATTO vs. massive MIMO

In this paper, we compare two potential 5G wireless technologies, ATTO-cell and massive MIMO, from a human EM-exposure point of view. A scenario, which allows one to make such comparison, was proposed. A set of finite-difference time-domain simulations was performed in order to estimate an average worst-case specific absorption rate in both cases. It was shown that starting at a certain distance from a massive MIMO base station, its exposure becomes lower than exposure by ATTO-cells.