Pulse or digital communications – Receivers – Automatic frequency control
Reexamination Certificate
2007-10-09
2007-10-09
Tran, Khanh (Department: 2611)
Pulse or digital communications
Receivers
Automatic frequency control
Reexamination Certificate
active
11470394
ABSTRACT:
Techniques are provided for synthesizing a long coherent I and Q correlation integral at a particular frequency by synthetically combining a sequence of shorter correlation integrals at the same or different frequency. Techniques are also provided for acquiring a carrier-modulated signal with an unknown shift of the carrier frequency, and possibly some additional unknown signal parameters. These techniques involve synthesizing coherent correlation sums at a fine frequency resolution, using coherent correlation sums that are calculated at a coarse frequency resolution. This approach allows for coherent processing of the received signal over an arbitrarily long time interval, while avoiding the excessive computational requirements of traditional methods.
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Zakharov et al. DFT-based frequency estimators with narrow acquisition range Feb. 2001, IEE Proc. Commun., vol. 148, No. 1.
Sahai Anant
Tsitsiklis John
Ahn Sam K.
Hallman Jonathan W.
MacPherson Kwok & Chen & Heid LLP
SiRF Technology Inc.
Tran Khanh
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