Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2006-07-06
2011-10-18
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
C375S260000, C375S346000, C375S350000, C375S267000, C370S203000, C370S208000
Reexamination Certificate
active
08040982
ABSTRACT:
The disclosed technology relates to estimating the frequency response of a frequency division multiplexed (FDM) channel. In accordance with one aspect of the invention, a channel estimation circuit of a receiver can compute initial estimates of the frequency response of sub-channels in the FDM channel. A phase adjustment circuit can adjust the phase components of the initial estimates to provide phase-adjusted estimates. A smoothing circuit can apply a smoothing operation to the phase-adjusted estimates to provide smoothed phase-adjusted estimates. When necessary, a reverse phase adjustment circuit can reverse the phase adjustment by adjusting the phase components of the smoothed phase-adjusted estimates to provide final channel estimates.
REFERENCES:
patent: 6608863 (2003-08-01), Onizawa et al.
patent: 7058002 (2006-06-01), Kumagai et al.
patent: 2004/0156309 (2004-08-01), Chadha et al.
patent: 2005/0163238 (2005-07-01), Fujii
patent: 2007/0268976 (2007-11-01), Brink et al.
patent: 2009/0310722 (2009-12-01), Lewis
Nabar Rohit
Shirali Kedar
Fan Chieh M
Hughes Eboni
Marvell International Ltd.
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