Abstract: A computer-implemented method for tracking a communication device moving through an indoor environment; the method includes: i) obtaining channel impulse responses, CIRs, between the communication device and anchor devices along multiple propagation paths; ii) determining an a priori distribution of the location of the communication device within the environment; iii) determining from the channel impulse responses conditional distributions of the range-related measurements conditioned on a range between a potential location of the communication device within the a priori distribution and the respective anchor devices along respective line of sight, LoS, and first order propagation paths; and iv) estimating the location of the communication device as the potential location for which a combination of the a priori distribution and the conditional distributions is maximized.

Abstract: Example embodiments describe a method for estimating a number of persons present in a room including i) obtaining measurements of electromagnetic sounding signals transmitted within the room; ii) determining at least one reverberation time from the measurements; iii) determining the number of people in the room based on the at least one reverberation time, on a room parameter indicative for a capacity of the room for absorbing the signals and a person parameter indicative for an average capacity of a person for absorbing the signals.