A regulator circuit for reducing the output noise when regulators are switched includes a linear regulator and a switching regulator. While a wireless base station 1 that transmits and receives a distance-measuring signal to and from a terminal 2 to be measured by wireless communication is disposed at each corner forming an equilateral triangular, the length of each side of the equilateral triangle is made to be a maximum communication distance of the wireless base station 1. The determination is separated into two elements, one being sufficient for use with SU-MIMO, and another being provided, with a second codebook indicator, if MU-MIMO is to be employed. The method can be used to perform effective monitoring, management, and tailoring of treatments for patients suffering from congestive heart failure, as well as many other diseases. The MLSD detector has a priori knowledge of typical error events that can occur during transmission through the channel. The method includes an initial step of coupling the network device to a provisioning device via a physically secure communications link.