US Patent 7158580 Data pulse spectrum control
Patent 7158580 was granted and assigned to Microsoft on January, 2007 by the United States Patent and Trademark Office.
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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.
US Patent 07158580 Data pulse spectrum control US Patent 7158580 Data pulse spectrum control
US Patent 07158580 Data pulse spectrum control
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