Approaches for device-free multi-user localization with passive RFID

User localization information is an important data source for ubiquitous assistance in smart environments and other location aware systems. Mostly there is a need for non-invasive, wireless, privacy preserving technologies. Device-free localization approaches (DFL) provide these advantages with no need for user-attached hardware. A common goal within the research of DFL technologies is the distinction and tracking of multiple users in an indoor scenario. In our recent work we show that DFL approaches utilizing completely passive RFID transponders can localize one person very precisely. In this work we show basic approaches and conduct first experiments in an indoor room DFL scenario for proof of concept and validation. We show that it is possible to distinguish between two users with reasonable precision and computation demand.