Time-space sampling and mobile device calibration for wifi indoor location systems
Abstract:
Indoor location systems based on IEEE 802.11b (WiFi) mobile devices often rely on the received signal strength indicator to estimate the user position. Two key characteristics of these systems have not yet been fully analyzed, namely, the temporal and spatial sampling process required to adequately describe the distribution of the electromagnetic field in indoor scenarios; and the device calibration, necessary for supporting different mobile devices within the same system. By using a previously proposed nonparametric methodology for system comparison, we first analyzed the time-space sampling requirements for WiFi indoor location systems in terms of conventional sampling theory and system performance. We also proposed and benchmarked three new algorithms for device calibration, with increasing levels of complexity and performance. We conclude that feasible time and space sampling rates can be used, and that calibration algorithms make possible the handling of previously unknown mobile devices in the system. © 2011 IEEE.
Año de publicación:
2011
Keywords:
- device calibration
- IEEE 802.11b
- indoor location
- fingerprinting
- Received Signal Strength
- sampling
Fuente:
Tipo de documento:
Article
Estado:
Acceso restringido
Áreas de conocimiento:
- Ciencias de la computación
- Red inalámbrica
Áreas temáticas:
- Ciencias de la computación
- Física aplicada
- Juegos y diversiones de interior