Patents by Inventor Douglas I. Averst

Douglas I. Averst 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 Fast Fourier Transform based maximal ratio combining
    Patent number: 5550872
    Abstract: A method and apparatus diversity-combine radio signals received from a plurality of branches (108, 214). Each radio signal comprises a plurality of subchannels (806). The radio signal from each branch (108, 214) is digitized (904) into digital samples that are converted (908, 910) into frequency domain signals (702, 712). Each frequency domain signal (702, 712) corresponds to a subchannel and a branch (108, 214). A weighting factor is determined (916) for each branch (108, 214) and each subchannel (806) from instantaneous signal energy and noise power calculated (912, 914) from the frequency domain signals (702, 712). The frequency domain signal (702, 712) corresponding to each branch (108, 214) and each subchannel (806) is multiplied (918) by the weighting factor therefor to produce weighted frequency domain signals corredponding to each branch and each subchannel.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: August 27, 1996
    Assignee: Motorola, Inc.
    Inventors: Joseph C. Liberti, Jr., Douglas I. Averst, Tony R. Branch, Stephen R. Carsello
  • Method and apparatus for carrier tracking and demodulation
    Patent number: 5533062
    Abstract: A frequency shift keyed receiver (214, 220, 218) estimates a carrier frequency and demodulates (1020) a symbol value associated with the carrier frequency. During symbol intervals, the receiver (214, 220, 218) receives a radio signal including symbol values (502-518) corresponding to predetermined frequency offsets (604, 606) from a carrier frequency. The radio signal is digitized (1008) during a symbol interval, and then converted (1010) into a frequency domain signal. The frequency domain signal is stored (1012), and additional symbol intervals are converted to obtain a plurality of frequency domain signals, which are processed to generate (1016) a composite frequency domain signal (702, 704). A windowing function (706) of predetermined shape is convolved (1018) with the composite frequency domain signal (702, 704) to locate a frequency distribution therein that corresponds to the predetermined frequency offsets (604, 606).
    Type: Grant
    Filed: October 3, 1994
    Date of Patent: July 2, 1996
    Assignee: Motorola, Inc.
    Inventors: Joseph C. Liberti, Jr., Douglas I. Averst, Tony R. Branch, Stephen R. Carsello
  • Code division multiple access (CDMA) inbound messaging system utilizing over-the-air programming
    Patent number: 5343494
    Abstract: A method for receiving and processing data in a portable transceiver (20) comprises the steps of receiving (320) at least one information signal and decoding (325) the at least one information signal to recover information included therein. The method further comprises the steps of generating (345) a pseudo-noise (PN) sequence in accordance with the information.
    Type: Grant
    Filed: January 13, 1993
    Date of Patent: August 30, 1994
    Assignee: Motorola, Inc.
    Inventors: Douglas I. Averst, Stephen R. Carsello, Warren P. Glotzbach