Pulse or digital communications – Systems using alternating or pulsating current – Antinoise or distortion
Reexamination Certificate
2007-01-02
2007-01-02
Patel, Jay K. (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Antinoise or distortion
C375S346000, C332S107000, C332S123000, C455S063100, C455S114200
Reexamination Certificate
active
10417520
ABSTRACT:
The present invention reduces adjacent channel interference for a wireless peripheral device. A direct digital synthesizer generates a waveform having intermediate angular changes during a transition time between symbol intervals. After the transition time, the direct digital synthesizer generates the waveform with an angular value that corresponds to the symbol being transmitted. In an exemplary embodiment, a generated waveform is characterized by one of two designated frequencies in response to a value of an input information bit. The waveform is further characterized by at least one intermediate frequency during a transition time between a change of the designated frequency. Another embodiment of the invention utilizes phase changes rather than frequency changes during reduce adjacent channel interference. With another aspect of the invention, methods are provided to determine waveform parameters for reducing adjacent channel power (ACP) to a maximum level of interference.
REFERENCES:
patent: 3938045 (1976-02-01), Mathwich
patent: 4134072 (1979-01-01), Bolger
patent: 4962510 (1990-10-01), McDavid et al.
patent: 5150048 (1992-09-01), McAuliffe et al.
patent: 5703540 (1997-12-01), Gazda et al.
patent: 5856789 (1999-01-01), Huang
patent: 6066967 (2000-05-01), Cahill et al.
patent: 6298250 (2001-10-01), Nilsson
K. Gentile, “Fundamentals of Digital Quadrature Modulation,” RF Design, Feb. 2003, pp. 40-47.
Banner & Witcoff , Ltd.
DSouza Adolf
Microsoft Corporation
Patel Jay K.
LandOfFree
Data pulse spectrum control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data pulse spectrum control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data pulse spectrum control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3782809