Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2007-01-23
2007-01-23
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C370S324000, C375S356000
Reexamination Certificate
active
10610863
ABSTRACT:
A system and method is provided for timing synchronization of receivers in a wireless network to improve the accuracy of real time location tracking methods utilize time difference of arrival methods. The synchronization signals are provided over the wired network which connects the wireless receiver base stations. The timing signals may be transmitted on an unused pair of wires, or may be superimposed on a pair of wires which are used for Ethernet data signals or a pair of wires used for Ethernet DC power signals.
REFERENCES:
patent: 6230021 (2001-05-01), Ohdachi
patent: 2006/0067451 (2006-03-01), Pollman et al.
“Enhancements to the RADAR User Location and Tracking System” by Bahl et al.;Microsoft ResearchandUniversity of California at San Dieago; pp. 1-13.
“User Location and Tracking in an In-Building Radio Network” by Paramvir Bahl;Microsoft Research, Technical Report, Feb. 1999, pp. 1-12.
Baker & Botts LLP
Nguyen Lee
Symbol Technologies Inc.
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