Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-06-12
2007-06-12
Bopcure, Tesfaldet (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S350000
Reexamination Certificate
active
09924199
ABSTRACT:
Techniques to filter pilot symbols for a pilot in an “adaptive” manner to provide an improved estimate of the response of a communication channel. A received signal may experience different channel conditions at different times, and different multipaths may also experience different channel conditions even when received close in time. A pilot filter with an adaptive response is used to provide an improved estimate of the channel response. Various adaptive pilot filtering schemes may be used. In a first scheme, the channel conditions are estimated based on the quality of the received pilot. In a second scheme, the channel conditions are estimated based on the quality of the pilot estimates (i.e., the filtered pilot symbols). For each scheme, a particular filter response is selected based on the estimated quality of either the received pilot or the pilot estimates.
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Agrawal Avneesh
Shiu Da-shan
Subrahmanya Parvathanathan
Bopcure Tesfaldet
Brown Charles D.
Evans Matthew J.
Qualcomm Incorporated
Rouse Thomas
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