Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2003-08-13
2008-09-23
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000, C375S144000, C375S142000, C375S150000, C375S316000, C455S307000, C455S266000, C455S130000, C455S339000, C455S136000, C702S149000, C702S010000
Reexamination Certificate
active
07428262
ABSTRACT:
A method and apparatus for channel estimation in a rake receiver of a CDMA communication system operates with a finite-impulse-response channel estimation filter with L taps and having a fixed delay. A pilot sequence of a received sequence of data from a channel of the communication system on the rake receiver is input. A quality of the channel of the communication system is determined using noise or Doppler measurements. These measurements are used in adjusting a bandwidth of the filter to accommodate the channel quality while keeping the fixed delay, which minimizes the delay buffer size. The filter is then used to operate on the received sequence of data to provide coherent modulation.
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Larosa Christopher P.
Mallette Alexandre
Oliver John P.
Zancho Bryan W.
Fan Chieh M.
Lee Siu M
Motorola Inc.
Vaas Randall S.
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