Communications: electrical – Continuously variable indicating – With meter reading
Reexamination Certificate
2005-11-08
2005-11-08
Horabik, Michael (Department: 2635)
Communications: electrical
Continuously variable indicating
With meter reading
C340S010330, C342S118000
Reexamination Certificate
active
06963289
ABSTRACT:
A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.
REFERENCES:
patent: 5119104 (1992-06-01), Heller
patent: 6353406 (2002-03-01), Lanzl et al.
patent: 6424264 (2002-07-01), Giraldin et al.
patent: 6525648 (2003-02-01), Kubler et al.
patent: 6700533 (2004-03-01), Werb et al.
patent: 2002/0086640 (2002-07-01), Belcher et al.
patent: 2002/0098852 (2002-07-01), Goren et al.
patent: WO 01/61883 (2001-08-01), None
Aljadeff Daniel
Amsalem Reuven
Granot Yair
Tsruya Shalom
AeroScout, Ltd.
Harris A. Mitchell
Horabik Michael
Nguyen Nam
Weiss, Moy & Harris P.C.
LandOfFree
Wireless local area network (WLAN) channel radio-frequency... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wireless local area network (WLAN) channel radio-frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wireless local area network (WLAN) channel radio-frequency... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3474372