Effective initial channel access in dense loosely coupled wireless charging pad environments

An initial channel access technology using continuous-wave signals is proposed for establishing stable initial channel access between a transmitter and multiple receivers in a dense environment of loosely coupled (LC) wireless charging pads. Through the experiment, it is confirmed that the proposed system exhibits a fast and stable channel access performance. The initial channel access time of the proposed system is a minimum of 7 ms and a maximum of 7.82 s faster than the conventional technologies with a small deviation ranging from 68.2 to 90.4 ms, even for an increase in the number of LC wireless chargers in a small area.