Pulse or digital communications – Testing
Reexamination Certificate
2008-11-24
2011-11-22
Corrielus, Jean B (Department: 2611)
Pulse or digital communications
Testing
C375S340000
Reexamination Certificate
active
08064507
ABSTRACT:
A method and apparatus in a multiple sub-carrier digital communication receiver that estimates a communication channel. A second set of channel estimates are generated based on a Wiener filter interpolation of a first set of channel estimates. Pre-determined transmit pilot symbols may be used to generate the first set of channel estimates in an OFDM communication system. The coefficients of the Wiener interpolation filter are based on a channel impulse response estimate that includes two or more narrow regions of non-zero amplitude separated by one or more wide regions of essentially zero amplitude. The Wiener interpolation filter coefficients are also based on a Doppler frequency estimate. The Doppler frequency estimate may be determined from the first set of channel estimates, while the Wiener interpolation filter coefficients may be generated from a pre-determined set of channel impulse responses.
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Cheng Hao-Ren
Chu Chih-Yuan
Lee Gaspar
Bever Hoffman & Harms LLP
Corrielus Jean B
Harms Jeanette S.
Qualcomm Atheros, Inc.
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