Pulse or digital communications – Receivers
Reexamination Certificate
2005-07-05
2008-12-02
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Receivers
Reexamination Certificate
active
07460616
ABSTRACT:
A FFT-based blind channel searching and estimation method, comprising the steps of waiting for a power-on signal from a DVB-S receiver, judging whether a complex of automatic gain control signals of the receiver have converged, producing a complex of data samples by utilizing the FFT, calculating energy after the FFT and accumulating the energy to be saved to the memory of the DVB-S receiver, detecting whether sample times exceed a predetermined value, filtering a complex of signal noises after accumulation with a filter, judging whether a channel of the channel has been searched, finishing searching and calculating to produce a symbol speed and a center frequency shift, and enabling a decoder action. The present invention is applied for a DVB-S receiver to effectively decrease the time required to complete a blind search and guarantees that an exact signal in a DVB-S receiver is found.
REFERENCES:
patent: 5930295 (1999-07-01), Isley et al.
patent: 6720824 (2004-04-01), Hyakudai et al.
patent: 7308286 (2007-12-01), Felter
patent: 2001/0055271 (2001-12-01), Okada et al.
patent: 2005/0141630 (2005-06-01), Catreux et al.
Ahn Sam K
Ali Corporation
Birch & Stewart Kolasch & Birch, LLP
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