Patents by Inventor John D. Kaewell, Jr.

John D. Kaewell, Jr. 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).

  • Patent number: 9100250
    Abstract: A CDMA communication system includes a signal processor which encodes voice and nonvoice signals into data at various rates, e.g. data rates of 8 kbps, 16 kbps, 32 kbps, or 64 kbps as I and Q signals. The signal processor selects a specific data rate depending upon the type of signal, or in response to a set data rate. When the signal is received and demodulated, the baseband signal is at the chip level. Both the I and Q components of the signal are despread using the conjugate of the pn sequence used during spreading, returning the signal to the symbol level. Carrier offset correction is performed at the symbol level. A lower overall processing speed is therefore required.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: August 4, 2015
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Publication number: 20120063490
    Abstract: A plurality of data streams are convolutionally encoded. Each convolutionally encoded data stream has a particular data rate. The particular data rate of each data stream is adjusted so that an adjusted data rate of that data stream matches a data rate of a CDMA transmission. When the particular data rate of one of the data streams is below the data rate of the CDMA transmission, data of the one data stream is repeated to match the data rate of the CDMA transmission. The adjusted data rate data streams is transmitted as the CDMA transmission. The adjusted data streams are transmitted together in the CDMA transmission and the CDMA transmission is quadrature modulated.
    Type: Application
    Filed: November 18, 2011
    Publication date: March 15, 2012
    Applicant: INTERDIGITAL TECHNOLOGY CORPORATION
    Inventor: John D. Kaewell, JR.
  • Patent number: 7088764
    Abstract: A spread spectrum communication station simultaneously receives multiple data channels on the same frequency spectrum and at data rates which may individually vary. A determination is made of signal quality based on signal to noise ratio (SNR) the channels by comparing a forward error corrected sample with a corresponding delayed sample. The comparison of the delayed despread data with the decoded data provides the indication of SNR.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: August 8, 2006
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6973523
    Abstract: A modem interface transfers data between a high data rate interface and a wireless interface. The modem interface has a plurality of parallel data highways. Each data highway has frames with time slots for transferring data. The plurality of highways outputs data to the high data rate interface and the wireless interface in selected time slots. At least one of the data highways has an input configured to receive data from the high data rate interface in selected time slots. At least one of the data highways has an input configured to receive data from the wireless interface in selected time slots. A processor controls the transfer of data between the plurality of highways.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: December 6, 2005
    Assignee: InterDigital Technology Corp.
    Inventors: John D. Kaewell, Jr., Stratis Gavnoudias
  • Patent number: 6865217
    Abstract: A method for simultaneously receiving and processing multiple channels of data at independent rates which share a same frequency spectrum begins with receiving a multichannel data communication signal having multiple data channels at independent data rates on the same frequency spectrum. Next, selected channels of data of the received signal are separated and the data rate for each channel is identified. Then each separated channel of the received signal is decoded at an assigned data rate using a common decoding memory. Lastly, each separated channel is directed to a different decoding means and each decoding means is assigned a data rate responsive to the identification of data rates when the channels were separated.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: March 8, 2005
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6577673
    Abstract: A spread spectrum base station receives a multichannel data communication signal. The multichannel data communication signal has multiple data channels at independent data rates on a same frequency spectrum. Selected channels of data of the received signal are separated and the data rate for each channel identified. Each separated channel is decoded at an assigned data rate. A common decoding memory is shared.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: June 10, 2003
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6577672
    Abstract: A spread spectrum mobile station receives a multichannel data communication signal. The multichannel data communication signal has multiple data channels at independent data rates on a same frequency spectrum. Selected channels of data of the received signal are separated and the data rate for each channel identified. Each separated channel is decoded at an assigned data rate. A common decoding memory is shared.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: June 10, 2003
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6404828
    Abstract: A decoder decodes a plurality of received convolutionally encoded date signals simultaneously. At least two of the encoded data signals have a different data rate. The decoder receives undecoded I and Q symbols from the plurality of encoded data signals and outputs Euclidian distances corresponding to each encoded signal. Each data signal's distances are mapped on to a trellis. To output decoded symbols of each data signal, decisions are traced back in each data signal's trellis.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: June 11, 2002
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6256339
    Abstract: A communication system where the data rate of a given transmission has been encoded by a transmitter and is then used to adjust a plurality of convolutional decoders sharing common memory. The system uses common processing resources to provide up to four discrete channels having multi-rate convolutional error correction decoding resulting in a reduced silicon area and low power operation. The system is capable of supporting data communication at 8 kbps up to 64 kbps for high rate ISDN communication in receivers of both base station and consumer unit locations.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: July 3, 2001
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 6005898
    Abstract: A communication system where the data rate of a given transmission has been encoded by a transmitter and is then used to adjust a plurality of convolutional decoders sharing common memory. The system uses common processing resources to provide up to four discrete channels having multi-rate convolutional error correction decoding resulting in a reduced silicon area and low power operation. The system is capable of supporting data communication at 8 kbps up to 64 kbps for high rate ISDN communication in receivers of both base station and consumer unit locations.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: December 21, 1999
    Assignee: InterDigital Technology Corporation
    Inventor: John D. Kaewell, Jr.
  • Patent number: 5752190
    Abstract: A Supervisory Audio Tone (SAT) based Carrier-to-Interference (C/I) ratio measurement system uses the SAT tone to determine the desired signal to undesired interferers so that an intelligent hand-off decision can be made in a digital cellular communication system. The measurement is implemented by digital signal processors which allows additional signal processing and subsequently noise rejection over analog techniques. The received level of the desired SAT as well as the received levels of the SATs for the co-channel interferers is detected. The ratio of the desired SAT level to the sum of the undesired SAT levels provides the C/I measurement. By monitoring this C/I measurement, the base station can determine when to make a hand-off. This SAT based C/I measurement system also aids in the selection of a candidate cell to which the subscriber is handed-off. Surveillance receivers in the candidate cells make SAT based C/I measurements as well as Received Signal Strength Indication (RSSI) measurements.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: May 12, 1998
    Assignee: Hughes Electronics
    Inventors: John D. Kaewell, Jr., David M. Cooley
  • Patent number: 5625653
    Abstract: A wireless digital telephone system containing at least one emulated base station plus one or more subscriber stations, the emulated base station comprising a station similar to the subscriber station but having the capability of initiating a synchronization process whereby it is enabled to assign time slots to the subscriber station within the frame pattern of an amplitude signal by means of monitoring for positive edges in the signal.
    Type: Grant
    Filed: January 17, 1996
    Date of Patent: April 29, 1997
    Assignee: InterDigital Technology Corporation
    Inventors: John D. Kaewell, Jr., Scott D. Kurtz
  • Patent number: 5495508
    Abstract: A wireless digital telephone system containing at least one emulated base station plus one or more subscriber stations, the emulated base station comprising a station similar to the subscriber station but having the capability of initiating a synchronization process whereby it is enabled to assign time slots to the subscriber station within the frame pattern of an amplitude signal by means of monitoring for positive edges in the signal.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: February 27, 1996
    Assignee: InterDigital Technology Corporation
    Inventors: John D. Kaewell, Jr., Scott D. Kurtz
  • Patent number: 5448616
    Abstract: An internal bit error rate (BER) test capability is built into the analog channel unit of a digital cellular base station. This test capability is controlled by the mobile telephone switching office (MTSO) to automatically perform BER measurements. The analog channel unit with this integrated function performs random sequence generation, continuous frequency shift keying (FSK) modulation, FSK random sequence acquisition, FSK demodulation and bit error tallying. The BER test functions built into the analog channel unit allow the tests to be performed via remote control from an operations and maintenance center of the MTSO. Having the BER test functions built into the analog channel unit reduces the number of physical interfaces which the analog channel unit has to support.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: September 5, 1995
    Assignee: Hughes Aircraft Company
    Inventors: John D. Kaewell, Jr., David M. Cooley
  • Patent number: 5436955
    Abstract: A compatible analog channel unit for a digital cellular telephone system services both analog and digital mode subscribers on the same system hardware. The analog channel unit which may be configured by the service provider to permit easy upgrading of service during the life of the equipment without additional capital expense to the service provider. All analog system functions required of an analog cellular base station are provided in firmware and executed on commercial digital signal processors (DSPs). The same DSPs, when down-loaded with different firmware, perform TDM/TDMA related functions as required of a digital cellular base station. A system operator can configure channel units from a remote location by simply downloading the appropriate firmware. The channel unit firmware, whether analog or digital, is downloaded into the system hardware according to the assigned mode. This permits dynamic channel allocation according to system requirements.
    Type: Grant
    Filed: July 30, 1993
    Date of Patent: July 25, 1995
    Assignee: Hughes Aircraft Company
    Inventors: John D. Kaewell, Jr., David M. Cooley
  • Patent number: 5432822
    Abstract: A receiver (30) in a digital communication system determines the phase error magnitude (60) and the magnitude error (54) for each received channel symbol and selects Reed-Solomon symbol erasures from the magnitude error and phase error magnitude values as a function of mobile unit speed (52) which is determined from demodulator data. The selected symbol erasures are implemented (78) in a Reed-Solomon decoder resulting in improved decoding performance.
    Type: Grant
    Filed: March 12, 1993
    Date of Patent: July 11, 1995
    Assignee: Hughes Aircraft Company
    Inventor: John D. Kaewell, Jr.
  • Patent number: 5402451
    Abstract: A Digital Post-Detection (Post-Discriminator) FM spatial diversity combination circuit improves performance for fading channels typical of cellular radio operating environments. A feature of this system is its flexibility. The system can be configured to use signal quality information in a manner which is appropriate for a given radio environment. Also, the weighting information can be derived from various sources and then processed to accommodate various situations. This spatial combiner has the ability to perform as a "hybrid" combiner. For example, this circuit can combine signals from various receivers based on soft weighting information, as in a maximal ratio combiner, or on hard weighting information, as in a switching combiner. The basic circuit includes a normalizing circuit (21, 22, 23) which receives the digitized received signal strength indicator samples from each of first and second receivers (11, 12) and generates first and second weighting signals.
    Type: Grant
    Filed: January 11, 1993
    Date of Patent: March 28, 1995
    Assignee: Hughes Aircraft Company
    Inventors: John D. Kaewell, Jr., David M. Cooley, Youngky Kim
  • Patent number: 5361046
    Abstract: A modulator capable of providing a fractional sample or symbol 995486 time employs a decimation counter (23) responsive to a clock having a frequency equal to M/N.times.(data symbol clock), where M is an interpolation factor and N is a decimation factor, for generating a data symbol clock to select FSK symbols from a sampled data array (21). A multiplier (26) receives the FSK symbols and multiplies the symbols by a weighting factor determined by the decimation counter. When the decimation counter wraps around due to a modulo M operation, a fractional weight is calculated for the current FSK symbol, then a new FSK symbol is selected, and then a fractional weight is calculated for the new FSK symbol. When the decimation counter has not wrapped, the full weighting, N, is output for the current FSK symbol.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: November 1, 1994
    Assignee: Hughes Aircraft Company
    Inventors: John D. Kaewell, Jr., David M. Cooley
  • Patent number: 4953197
    Abstract: A spatial diversity system for digital mobile telephone networks which comprises at least two antennas, one antenna being part of a primary (or master) unit and the other being part of a diversity (or slave) unit, each unit having processing means to detect the "quality" of digital audio signals received by their respective antennas, the "quality" comprising link quality, AGC level and parity errors; the primary unit being capable of comparing the "quality" of the audio signals received by each antenna, selecting the higher "quality" signal and transmitting the higher "quality" signal to the telephone network.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: August 28, 1990
    Assignee: International Mobile Machines Corporation
    Inventors: John D. Kaewell, Jr., Nicholas C. Schreier, James J. Roller
  • Patent number: 4935927
    Abstract: A wireless digital telephone system containing at least one emulated base station plus one or more subscriber stations, the emulated base station comprising a station similar to the subscriber station but having the capability of initiating a synchronization process whereby it is enabled to assign time slots to the subscriber station within the frame pattern of an amplitude signal by means of monitoring for positive edges in the signal.
    Type: Grant
    Filed: November 20, 1987
    Date of Patent: June 19, 1990
    Assignee: International Mobile Machines Corporation
    Inventors: John D. Kaewell, Jr., Scott D. Kurtz