Pulse or digital communications – Receivers
Reexamination Certificate
2005-10-31
2009-06-09
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Receivers
Reexamination Certificate
active
07545885
ABSTRACT:
The present invention relates to a receiving apparatus for a mobile communications system which can be modulated using different modulation types at the transmitter end. According to one embodiment of the invention, in the middle of a data burst of a Bluetooth communications system, a GFSK modulation method is switched to an M-DPSK modulation method, which is used for the payload data. A frequency offset estimation unit is provided for GFSK-modulated signals in a first receiving section and estimates the frequency offset by averaging over a bit sequence of a trailer of a data burst. The frequency offset is corrected in a second receiving section, by means of a frequency correction unit which operates on the basis of the CORDIC algorithm.
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patent: 7415078 (2008-08-01), Smit
patent: 2001/0022805 (2001-09-01), Dabak et al.
patent: 199 48 899 (2001-04-01), None
patent: 1 484 880 (2004-12-01), None
“The CORDIC Trigonometric Computing Technique”, Jack E. Volder, IRE Transactions On Electronic Computers, vol. 8, Sep. 1959, pp. 330-334.
Hammes Markus
Li Puma Giuseppe
Ahn Sam K
Eschweiler & Associates LLC
Infineon - Technologies AG
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