1. Rf ranging.
http://www.rfranging.com/
. Accessed 9 Apr 2016
2. Usrp n210.
https://www.ettus.com/
. Accessed 9 Apr 2016
3. ISO/IEC 14443: Identification cards - Contactless integrated circuit cards - Proximity cards - Part 2: Radio frequency power and signal interface (2010)
4. Abrudan, T.E., Haghparast, A., Koivunen, V.: Time synchronization and ranging in OFDM systems using time-reversal. IEEE Trans. Instrum. Meas. 62, 3276–3290 (2013)
5. Alliance, Z.: Zigbee specification. ZigBee document 053474r13 (2006).
http://www.zigbee.org