Journal
IEEE TRANSACTIONS ON MOBILE COMPUTING
Volume 13, Issue 4, Pages 907-920Publisher
IEEE COMPUTER SOC
DOI: 10.1109/TMC.2013.28
Keywords
Pervasive computing; signal analysis, synthesis, and processing; signal processing; location-dependent and sensitive
Funding
- German Academic Exchange Service (DAAD)
- German Federal Ministry of Education and Research (BMBF)
- Grants-in-Aid for Scientific Research [23240011] Funding Source: KAKEN
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We consider the detection of activities from non-cooperating individuals with features obtained on the radio frequency channel. Since environmental changes impact the transmission channel between devices, the detection of this alteration can be used to classify environmental situations. We identify relevant features to detect activities of non-actively transmitting subjects. In particular, we distinguish with high accuracy an empty environment or a walking, lying, crawling or standing person, in case-studies of an active, device-free activity recognition system with software defined radios. We distinguish between two cases in which the transmitter is either under the control of the system or ambient. For activity detection the application of one-stage and two-stage classifiers is considered. Apart from the discrimination of the above activities, we can show that a detected activity can also be localized simultaneously within an area of less than 1 meter radius.
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