Systems and methods of device-free motion detection and presence detection

A method of detecting motion in an area of interest, the method comprising:

• monitoring, concurrently, a measurable physical characteristic of wireless signals received at each node of a plurality of nodes positioned to monitor the area of interest, the wireless signals transmitted from one or more other nodes of the plurality of nodes;
• generating, at each node of the plurality of nodes, a value for the measurable physical characteristic of each transmitted wireless signal received from another node of the plurality of nodes;
• reporting, from each node of the plurality of nodes, the values for the measurable physical characteristic for processing using an aggregate disturbance calculation to detect a disturbance of wireless signals within the area of interest, the disturbance caused by motion of an object in the area interest, wherein the aggregate disturbance calculation is based on a plurality of reported values over a period of time.