Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-04-08
2008-03-25
Le, Thanh Cong (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S318000, C375S319000
Reexamination Certificate
active
07349680
ABSTRACT:
In RF transceivers, a method and system for using phase shift key (PSK) sync word for fine tuning frequency adjustment are provided. One aspect of the invention provides for adjusting a local oscillator frequency in a radio frequency (RF) receiver when a residual DC offset remains after a coarse frequency offset adjustment if performed. The fine adjustment may be necessary because of the synchronization required with a PSK-based modulated portion of a Bluetooth packet. A residual phase shift detected in a sync sequence portion of the Bluetooth packet may be utilized to determine a residual or fine frequency adjustment. This approach may allow an RF receiver to operate, in some instances, without the need for an equalizer. In this regard, the power consumed by the RF receiver may be minimized and/or the overall cost of the RF receiver may be reduced.
REFERENCES:
patent: 7164329 (2007-01-01), Toncich et al.
patent: 2003/0203728 (2003-10-01), Filipovic
patent: 2004/0081256 (2004-04-01), Shi et al.
BLUETOOTH, “Specification of the Bluetooth System, Core System Package, (Controller Volume)”, Version 1.2, Nov. 5, 2003, Specification vol. 2, pp. 97-132.
Ibrahim Brima
Jensen Henrik Tholstrup
Kim Hea Joung
Mak Siukai
Broadcom Corporation
Cong Le Thanh
McAndrews Held & Malloy Ltd.
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