Patents by Inventor L. Martin Hellmark

L. Martin Hellmark 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).

  • Method and apparatus for adaptive bit resolution in a digital receiver and digital transmitter
    Patent number: 6504863
    Abstract: A transceiver includes a receiver and a transmitter. The receiver includes an analog-to-digital conversion device for converting a received analog signal to digital form, and the transmitter includes a digital-to-analog conversion device for converting a digital signal into analog form for transmission. A selector selects the resolutions of the conversion devices. The resolution of the analog-to-digital conversion device is selected based on a received signal quality, e.g., the signal-to-noise ratio or the signal-to interference ratio. The resolution of the digital-to-analog conversion device is selected based on a crest factor of the transmitted signal, the crest factor depending, e.g., on the modulation format of the signal being transmitted. The higher the crest factor, the higher the resolution selected.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: January 7, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: L. Martin Hellmark