Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-10-02
2007-10-02
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C370S320000, C375S262000, C375S341000, C704S242000, C714S795000, C708S318000
Reexamination Certificate
active
10474192
ABSTRACT:
The invention provides a method and apparatus for estimating flat fading channel in CDMA communication system, said method is implemented by using an adaptive forward prediction technique based on lattice filter and maximum likelihood technique of Viterbi algorithm. The adaptive lattice filter is used to carry out prediction of LS criteria on channel fading, and a maximum likelihood detection technique completes Viterbi algorithm in accordance with a channel fading value obtained by the prediction, thus obtaining final estimation and decision about the transmitting signals. The present invention has the advantages that it can obtain accurate result for channel estimation and sequence decision when it operates in the fast fading channel, and overcome fast fading influence due to motion speed up of mobile station, thereby satisfying mobile station speed and corresponding receiving performance required in 3G mobile communication.
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Jin Yu
Li Gang
Liu Sheng
DSouza Adolf
Huawei Technologies Co. Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Payne David C.
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