Multiple base station automatic frequency control...

Details Multiple base station automatic frequency control... Multiple base station automatic frequency control...

2007-11-13

2007-11-13

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S316000, C455S260000

Reexamination Certificate

active

10813025

ABSTRACT:
An automatic frequency control (AFC) system applies in a mobile station for automatically controlling a local frequency signal to be substantially synchronized with an input signal which is a first received signal SHfrom a base station, and for being capable of shifting the frequency of the local frequency signal to be close to that of a second received signal Snewfrom another base station when the input signal is changed from the first received signal SHto the second received signal Snew. The AFC system comprises a control module, a memory unit, and an automatic frequency controller. The memory unit stores a plurality of AFC parameter sets; each AFC parameter set corresponds to a base station within the wireless cellular system. When the input signal SIis changed from the first received signal SHto the second received signal Snew, the control module fetches the AFC parameter set, which corresponds to the second base station, from the memory unit; it then applies the fetched AFC parameter set, which corresponds to the second base station, to the automatic frequency controller to shift the frequency of the local frequency signal fLto be close to that of the second received signal Snewfrom another base station.

REFERENCES:
patent: 5634205 (1997-05-01), Kurisu et al.
patent: 5774800 (1998-06-01), Mori
patent: 5909148 (1999-06-01), Tanaka
patent: 6275699 (2001-08-01), Ichihara
patent: 6278867 (2001-08-01), Northcutt
patent: 2003/0054772 (2003-03-01), Majaniemi
patent: 2004/0176148 (2004-09-01), Morimoto

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