Patents by Inventor Asad U. Aman

Asad U. Aman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Apparatus and method for modulating and digitally predistorting a signal in a multiple modulation schemes
    Patent number: 7362820
    Abstract: A programmable modulator (100) is programmable to operate in either of a GMSK or 8PSK mode. When operating in a GMSK mode, a signal modulating circuit 105 receives (210) a bit stream (110), maps the bit stream (110) to a phase value in complex I, Q form and applies a progressive rotation to the phase value according to GMSK specifications. The output (140) is filtered by a filter circuit (135), preferably using a complex Finite Impulse Response (FIR) filter using the standard coefficients for an 8PSK modulation to create (215) an approximate GMSK output (165). A GMSK correction circuit (150) determines a correction term that is added to the filter circuit output (165) so as to correct amplitude variations to allow the output to conform to GSM/EDGE standards. The same modulator (100) may be programmed to operate in an 8PSK mode with linear predistortion.
    Type: Grant
    Filed: May 18, 2005
    Date of Patent: April 22, 2008
    Assignee: Motorola, Inc.
    Inventors: Asad U. Aman, Thomas J. Kundmann, Gregory T. Nash