Patents by Inventor David Sorrells

David Sorrells 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).

  • Publication number: 20050185741
    Abstract: A fast correlator transform (FCT) algorithm and methods and systems for implementing same, correlate an encoded data word (X0-XM-1) with encoding coefficients (C0-CM-1), wherein each of (X0-XM-1) is represented by one or more bits and each said coefficient is represented by one or more bits, wherein each coefficient has k possible states, and wherein M is greater than 1. In accordance with the invention, X0 is multiplied by each state (C0(0) through C0(k-1)) of the coefficient C0, thereby generating results X0C0(0) through X0C0(k-1). This is repeating for data bits (X1-XM-1) and corresponding coefficients (C1-CM-1), respectively. The results are grouped into N groups. Members of each of the N groups are added to one another, thereby generating a first layer of correlation results. The first layer of results is grouped and the members of each group are summed with one another to generate a second layer of results. This process is repeated as necessary until a final layer of results is generated.
    Type: Application
    Filed: April 18, 2005
    Publication date: August 25, 2005
    Applicant: ParkerVision, Inc.
    Inventors: Gregory Rawlins, Michael Rawlins, David Sorrells
  • Publication number: 20050164670
    Abstract: A communication system comprising a multi-protocol, multi-bearer sub-system is described herein. The sub-system is a universal platform module that can transmit and receive one or more information signals in one or more protocols using one or more bearer services. In one embodiment, the sub-system may form a portion of a transceiver that is composed of a transmitter and a receiver, and which is a gateway server between a personal area network (PAN) and the global wireless network.
    Type: Application
    Filed: October 27, 2004
    Publication date: July 28, 2005
    Applicant: ParkerVision, Inc.
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses
  • Publication number: 20050143042
    Abstract: Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal, and applications thereof are described herein. Reducing or eliminating DC offset voltages and re-radiation generated when down-converting an electromagnetic (EM) signal is also described herein. Down-converting a signal and improving receiver dynamic range is also described herein.
    Type: Application
    Filed: February 17, 2005
    Publication date: June 30, 2005
    Applicant: ParkerVision, Inc.
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Jonathan Jensen, Martin Johnson, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins, Robert Short, Jamison Young
  • Publication number: 20050136861
    Abstract: A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In a first modulation embodiment, one information signal is phase modulated onto the carrier signal as part of the up-conversion process. In a second modulation embodiment, two information signals are multiplied, and, as part of the up-conversion process, one signal is phase modulated onto the carrier and the other signal is amplitude modulated onto the carrier. In a third modulation embodiment, one information signal is phase modulated onto the “I” phase of the carrier signal as part of the up-conversion process and a second information signal is phase modulated onto the “Q” phase of the carrier as part of the up-conversion process.
    Type: Application
    Filed: February 3, 2005
    Publication date: June 23, 2005
    Applicant: ParkerVision, Inc.
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses
  • Publication number: 20050123025
    Abstract: Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal generator, a demodulation/modulation facilitation module, and a MAC interface. The WLAN receiver includes at least one universal frequency translation module that frequency down-converts a received EM signal. In embodiments, the UFT based receiver is configured in a multi-phase embodiment to reduce or eliminate re-radiation that is caused by DC offset. The WLAN transmitter includes at least one universal frequency translation module that frequency up-converts a baseband signal in preparation for transmission over the wireless LAN. In embodiments, the UFT based transmitter is configured in a differential and multi-phase embodiment to reduce carrier insertion and spectral growth.
    Type: Application
    Filed: January 25, 2005
    Publication date: June 9, 2005
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins
  • Publication number: 20050100115
    Abstract: A balanced transmitter up-converts a baseband signal directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the baseband signal in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains the necessary information to reconstruct the baseband signal. The differential sampling is performed according to a first and second control signals that are phase shifted with respect to each other. In embodiments of the invention, the control signals have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal.
    Type: Application
    Filed: December 20, 2004
    Publication date: May 12, 2005
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins
  • Publication number: 20050085207
    Abstract: Methods, systems, and apparatuses, for down-converting and up-converting an electromagnetic signal. In embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. The output of the switch is filtered, and the desired harmonic is output.
    Type: Application
    Filed: October 25, 2004
    Publication date: April 21, 2005
    Applicant: ParkerVision, Inc.
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins
  • Publication number: 20050085208
    Abstract: Methods, systems, and apparatuses, for down-converting and up-converting an electromagnetic signal. In embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In embodiments, up-conversion is accomplished by controlling a switch with an oscillating signal, the frequency of the oscillating signal being selected as a sub-harmonic of the desired output frequency. When the invention is being used in the frequency modulation or phase modulation implementations, the oscillating signal is modulated by an information signal before it causes the switch to gate the bias signal. The output of the switch is filtered, and the desired harmonic is output.
    Type: Application
    Filed: October 25, 2004
    Publication date: April 21, 2005
    Applicant: ParkerVision, Inc.
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins
  • Publication number: 20050009494
    Abstract: Methods, systems, and apparatuses, and combinations and sub-combinations thereof, for down-converting and up-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (½, 1½, 2½ etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non-FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.
    Type: Application
    Filed: August 10, 2004
    Publication date: January 13, 2005
    Inventors: David Sorrells, Michael Bultman, Robert Cook, Richard Looke, Charley Moses, Gregory Rawlins, Michael Rawlins