Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2003-07-08
2008-05-20
Payne, David C. (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C342S099000, C348S683000, C358S463000, C367S094000, C455S114200, C455S278100, C455S296000
Reexamination Certificate
active
07376210
ABSTRACT:
Disclosed is an adaptive channel estimator for improving a performance of a general channel estimator in a mobile communication system, and a method for controlling the same. The adaptive channel estimator further detects a noise level of a channel and a channel speed, and implements an optimum noise elimination filter on the basis of the detected noise level and channel speed. A comparison between mapping degrees predetermined by the detected noise level and channel speed allows an optimum noise elimination filter to be implemented, If such a channel estimator is implemented, then optimum packet data transmission is available for not only a low-speed channel but also a high-speed channel. A channel compensation caused by a difference between a spreading factor (SF) of a pilot channel and a spreading factor (SF) of a data channel can be compensated on the condition that a slope compensator executed by a SF ratio is controlled by a filter coefficient controller.
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Chol Gin-Kyu
Kim Hun-Kee
Kim Noh-Sun
Moon Yong-Suk
DSouza Adolf
Payne David C.
Roylance Abrams Berdo & Goodman LLP
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