Doppler frequency estimation and adaptation for mobile...

Details Doppler frequency estimation and adaptation for mobile... Doppler frequency estimation and adaptation for mobile...

2011-07-05

2011-07-05

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Receivers

Reexamination Certificate

active

07974364

ABSTRACT:
A technique for Doppler frequency estimation and adaptation in a MediaFLO™ (Forward Link Only) receiver system includes receiving Orthogonal Frequency Division Multiplexing (OFDM) symbols in the receiver, dividing a Doppler frequency range into N ranges corresponding to N interpolation filters; determining a correlation between two OFDM symbols separated by time; estimating a Doppler frequency by the correlation of OFDM symbols; determining a ratio of the correlation of OFDM symbols; comparing the determined ratio of the correlation of OFDM symbols with a look up table of α stored at a receiver to determine a corresponding Doppler frequency; mapping α ranges stored at the look up table to suitable interpolation filters; estimating an interpolation filter from the mapped α ranges mapped against determined α ratio; adapting Time Domain Interpolation (TDI) to the selected interpolation filter; and synchronizing receiver to the TDI filter.

REFERENCES:
patent: 2006/0215778 (2006-09-01), Murthy et al.
patent: 2008/0273481 (2008-11-01), Chang
patent: 2009/0060093 (2009-03-01), Narahari et al.

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