Pulse or digital communications – Spread spectrum
Reexamination Certificate
2004-09-30
2008-10-14
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
C375S144000
Reexamination Certificate
active
07436876
ABSTRACT:
An ultra wideband system employing a threshold to detect signal quality during acquisition wherein the threshold is adjusted based on signal characteristics such as packet traffic rate, packet loss rate, and packet loss fraction. In one embodiment, the threshold is adjusted by adjusting the gain of a variable gain stage ahead of the threshold. In another embodiment, gain and threshold are adjusted in a coordinated manner wherein gain is adjusted for low signal levels and threshold is adjusted for high signal levels. In one embodiment, packet traffic rate is evaluated over an interval based on maximum packet length, number of monitor packets, and inter-packet delay. In a further embodiment, multiple ramp builders are operated in parallel at multiple code offset values to generate signal statistics to compare with the threshold. Embodiments are disclosed wherein the thresholds are adaptively adjusted based on signal performance characteristics or the multipath environment.
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Brethour Vernon R.
Dodoukh Irina
Fisher Teresa E.
Richards James
Roberts Mark
Bolourchi Nader
Payne David C.
Richards James
Time Domain Corporation
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