Patents by Inventor Daniel D. MacFarlane Shearer, III

Daniel D. MacFarlane Shearer, III 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).

  • Digital transmitter with constrained envelope and spectral regrowth over a plurality of carriers
    Patent number: 6928121
    Abstract: A constrained-envelope digital communications transmitter (10) places constraints on the envelope of spectrally constrained, digitally modulated communication signals (46) converted into diverse frequency channels (54) and combined into a composite signal (58). The envelope constraints achieve lower peak-to-average power ratio without allowing significant spectral regrowth. The composite signal (58) is applied to a plurality of cascade-coupled constrained-envelope generators (64). Each constrained-envelope generator (64) detects overpeak events (66) and configures corrective impulses (68) for the overpeak events (66). The corrective impulses (68) are distributed to the respective frequency channels (54) in accordance with a predetermined distribution profile (102) and are filtered into allocated shaped pulses (120) that exhibit a constrained spectrum.
    Type: Grant
    Filed: September 28, 2001
    Date of Patent: August 9, 2005
    Assignee: Intersil Americas, Inc.
    Inventors: Daniel D. MacFarlane Shearer, III, James A. Sills