An indoor location system uses an electrical power line, power line signal injection devices, and portable position receivers (tags) to generate location data relating to positions of the tags in a structure such as a residence or business. The indoor location system fingerprinting of multiple signals...http://www.google.fr/patents/US20100109842?utm_source=gb-gplus-shareBrevet US20100109842 - SUB ROOM LEVEL INDOOR LOCATION SYSTEM USING WIDEBAND POWER LINE POSITIONING
SUB ROOM LEVEL INDOOR LOCATION SYSTEM USING WIDEBAND POWER LINE POSITIONING
