Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2005-04-21
2009-10-06
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C342S200000, C370S235000, C370S329000, C375S150000, C375S224000, C375S232000, C375S316000, C375S340000, C375S347000, C455S101000, C455S132000, C455S272000, C455S296000
Reexamination Certificate
active
07599453
ABSTRACT:
A Doppler spread value of a channel in an Orthogonal Frequency Division Multiplexing (OFDM) system is estimated, wherein the channel comprises a plurality of carrier frequencies. Estimating involves selecting a set of two or more carrier frequencies from the plurality of carrier frequencies. A Doppler spread value is estimated for each of the selected carrier frequencies. An estimate of the Doppler spread value of the channel is produced by combining the estimated Doppler spread values of each of the selected carrier frequencies. For example, the Doppler spread value of the channel may be estimated by averaging the estimated Doppler spread values of each of the selected carrier frequencies.
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Liu Shuwang
Patel Dhaval
Potomac Patent Group PLLC
Telefonaktiebolaget L M Ericsson (publ)
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