1. A method for breathing rate estimation comprising: arranging a plurality of radio frequency sensors in a network around a subject within a structure; measuring received signal strengths (RSS) between the plurality of radio frequency sensors, wherein the measured RSS is at least partially indicative of breathing of the subject; determining a breathing rate estimation model based on information related to the measured signal strengths, wherein determining a breathing rate estimation model comprises: calculating, with a computer processor, a power spectral density versus frequency of the measured RSS, and identifying a frequency at which the power spectral density peaks, wherein the identified frequency correlates with the estimated breathing rate of the subject; and displaying an estimate of a breathing rate of the subject using the breathing rate estimation model.