Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-01-18
2011-01-18
Payne, David C (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S354000, C375S358000, C342S109000, C342S146000, C342S104000, C342S125000, C342S118000
Reexamination Certificate
active
07873099
ABSTRACT:
Time is transferred from an ultra wideband (UWB) transmitter to UWB receiver by transmitting a signal structure having an associated timing reference point together with a time value for the timing reference point. The UWB receiver receives the timing signal structure by synchronizing a receiver time base to the signal structure, demodulating the time value information, and using the demodulated time value information to set a receiver clock value. Propagation delay information is used to adjust the receiver clock value by advancing the receiver clock value to account for the propagation delay. In one embodiment, propagation delay is determined from a known distance between the transmitter and receiver. In another embodiment, the transmitter and receiver are part of a two-way link wherein propagation delay is measured by round trip timing measurements.
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Fullerton Larry W.
Richards James L.
Roberts Mark D.
Babayi Robert S.
Guarino Rahel
Payne David C
Time Domain Corporation
Venable LLP
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