Patents by Inventor Thomas J. Kolze

Thomas J. Kolze 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: 20100229075
    Abstract: A system for mitigating impairment in a communication system includes a delay block, a signal level block, a moving average window block, an impulse noise detection block, and a combiner. The delay block receives and delays each chip of a plurality of chips in a spreading interval. The signal level block determines a signal level of each chip of the plurality of chips in the spreading interval. The moving average window block determines a composite signal level for a chip window corresponding to the chip. The impulse noise detection block receives the signal level, receives the composite signal level, and produces an erasure indication for each chip of the plurality of chips of the corresponding chip window. The combiner erases chips of the plurality of chips of the spreading interval based upon the erasure indication.
    Type: Application
    Filed: October 8, 2009
    Publication date: September 9, 2010
    Applicant: BROADCOM CORPORATION
    Inventors: Nabil R. Yousef, Thomas J. Kolze, Jonathan S. Min
  • Patent number: 7765577
    Abstract: A method of transmitting data in a cable modem system includes the steps of encoding the data using forward error correction. The data is then encoded with Turbo encoding. The data is then sent to a modulation scheme. The data is then transmitted over a cable channel. The data is then demodulated. The data is then decoded using a Turbo decoder. An inverse of the forward error correction is then applied to the data.
    Type: Grant
    Filed: March 17, 2003
    Date of Patent: July 27, 2010
    Assignee: Broadcom Corporation
    Inventors: Ravi Bhaskaran, Bruce J Currivan, Thomas J Kolze, Ba-Zhong Shen
  • Publication number: 20100180165
    Abstract: A system and method are used to provide uncorrelated code hopping in a communications system. A shift register receives data. The shift register is clocked to shift the data. A scaler performs a scaling operation on the data with a numerical value of active codes. A truncator truncates the scaled data to its seven most significant bits to produce a pseudo random hop number. A code matrix shifter circularly shifts the active codes in a code matrix based on the pseudo random hop number to produce a circularly shifted code. A transmitter transmits the circularly shifted code.
    Type: Application
    Filed: February 19, 2010
    Publication date: July 15, 2010
    Applicant: Broadcom Corporation
    Inventors: Bruce J. CURRIVAN, Thomas J. Kolze, Kevin L. Miller, Richard S. Prodan, Jonathan S. Min
  • Publication number: 20100142553
    Abstract: A single carrier cable modem can be initialized on multiple channels. By initializing a cable modem on more than one channel, the error rate performance of short data packets in cable modems in an impulsive noise environment is improved. The advantage of low symbol rate transmission for short packets in an impulse noise environment is achieved without sacrificing burst capacity at a cable modem and without the complexity of transmitting multiple symbol waveforms simultaneously at a cable modem.
    Type: Application
    Filed: February 22, 2010
    Publication date: June 10, 2010
    Applicant: Broadcom Corporation
    Inventor: Thomas J. Kolze
  • Publication number: 20100131824
    Abstract: Handling burst error events with interleaved Reed-Solomon (RS) codes. A received signal, that has undergone convolutional interleaving sometime before, is received from a burst noise affected communication channel. The signal undergoes convolutional deinterleaving and the codewords generated there from undergo appropriate successive cyclic shifting to arrange burst noise affected symbols of various codewords into at least some common symbol locations. For example, at least two codewords have burst noise affected symbols in common symbol locations. An ensemble decoder jointly decodes multiple codewords during a same time period (i.e., processes multiple codewords simultaneously). By processing multiple codewords simultaneously, the ensemble decoder has greater error correction capability than a decoder that processes a single codeword at a time.
    Type: Application
    Filed: November 25, 2009
    Publication date: May 27, 2010
    Applicant: BROADCOM CORPORATION
    Inventor: Thomas J. Kolze
  • Publication number: 20100111141
    Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.
    Type: Application
    Filed: January 4, 2010
    Publication date: May 6, 2010
    Applicant: BROADCOM CORPORATION
    Inventors: Bruce J. Currivan, Nabil R. Yousef, Thomas J. Kolze, Gottfried Ungerboeck
  • Patent number: 7697546
    Abstract: A distributed cable modem termination system of the present invention includes a downstream transmitter hub, an upstream receiver hub, and a head end that communicatively couples to the downstream transmitter hub and to the upstream receiver hub via a packet data network. The head end and the downstream transmitter hub are operable to synchronize a clock of the downstream transmitter hub with a clock of the head end. Further, the upstream receiver hub and the downstream transmitter hub are operable to synchronize a clock of the upstream receiver hub with the clock of the downstream transmitter hub. Clock synchronization between the upstream receiver hub and the downstream transmitter hub are performed using ranging operations supported by at least one cable modem communicatively coupled to both the upstream receiver hub and the downstream transmitter hub via cable modem network plant.
    Type: Grant
    Filed: February 18, 2005
    Date of Patent: April 13, 2010
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Alexander G. MacInnis, Thomas J. Kolze, Richard S. Prodan
  • Patent number: 7675938
    Abstract: A single carrier cable modem can be initialized on multiple channels. By initializing a cable modem on more than one channel, the error rate performance of short data packets in cable modems in an impulsive noise environment is improved. The advantage of low symbol rate transmission for short packets in an impulse noise environment is achieved without sacrificing burst capacity at a cable modem and without the complexity of transmitting multiple symbol waveforms simultaneously at a cable modem.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: March 9, 2010
    Assignee: Broadcom Corporation
    Inventor: Thomas J. Kolze
  • Publication number: 20100052967
    Abstract: A method and apparatus is disclosed to extend a dynamic input range of an analog to digital converter (ADC). A composite ADC may include one or more ADCs. The one or more ADCs compare a signal metric of an analog input signal to quantization levels to produce intermediate digital output signals using one or more non-clipping input values. The composite ADC may select among the one or more intermediate digital output signals based on the signal metric of the analog input signal to produce a final digital output.
    Type: Application
    Filed: May 11, 2009
    Publication date: March 4, 2010
    Applicant: Broadcom Corporation
    Inventors: Bruce J. Currivan, Thomas J. Kolze, Lin He, Loke Tan, Ramon Gomez, Francesco Gatta
  • Patent number: 7673192
    Abstract: A system and method are used to provide uncorrelated code hopping in a communications system. A multi-bit linear shift register receives data and clocks the data fifteen times. A word assembler receives the shifted data and outputs a fifteen bit word. A mixer mixes the fifteen bit word with an numerical value of active codes to generate a mixed signal. A divider divides the mixed signal to produce a divided signal. A truncator truncates the divided signal to its seven most significant bits to produce a pseudo random hop number. A code matrix shifter circularly shifts the active codes in a code matrix based on the pseudo random hop number to produce a circularly shifted code. A transmitter transmits the circularly shifted code matrix.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: March 2, 2010
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Thomas J. Kolze, Kevin L. Miller, Richard S. Prodan, Jonathan S. Min
  • Publication number: 20100034220
    Abstract: Successive interference canceling for CDMA. ICI may result from a signal's multi-path effects, or by filtering/suppression of some of the component energy of the signaling waveforms. Energy component attenuation destroys orthogonality of CDMA symbols thereby causing ICI. An ICF suppresses frequency domain portions (attenuates ingress), but also introduces ICI. Following the ICF, the signal is de-spread, sliced, re-spread and convolved with the ICF echoes (except first tap echoes). Convolving re-spread hard decisions with delayed ICF taps is equivalent to partially re-modulating the first-pass hard decisions to efficiently “add-back-in” the signal energy which was blanked/subtracted by the ICF. Alternatively, parameter estimation de-rotates and re-rotates soft symbols and hard decisions, respectively, compensating for undesirable symbol rotation. The convolved signal is subtracted from a delayed version of the ICF output signal.
    Type: Application
    Filed: October 2, 2009
    Publication date: February 11, 2010
    Applicant: BROADCOM CORPORATION
    Inventors: Thomas J. Kolze, Nabil R. Yousef
  • Publication number: 20100002760
    Abstract: Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients.
    Type: Application
    Filed: September 17, 2009
    Publication date: January 7, 2010
    Applicant: BROADCOM CORPORATION
    Inventors: Thomas J. Kolze, Bruce J. Currivan
  • Patent number: 7643538
    Abstract: A communication system performs burst noise cancellation. A transmitter produces and transmits a spread signal that comprises at least one known-value symbol spread by a plurality of non data-carrying orthogonal codes and data symbols spread by at least one data-carrying orthogonal code. The transmitter transmits the spread signal across a communication link that introduces burst noise. A burst noise detector determines burst noise affected chips of the orthogonal codes. A weight computation functional block calculates a plurality of complex-valued combining weights based upon the burst noise affected chips. A vector de-spreader and a linear combiner operate in combination to use the plurality of non data-carrying orthogonal codes, the at least one data-carrying orthogonal code, and the plurality of complex-valued combining weights to de-spread the received spread signal to produce the data symbols with the burst noise substantially removed.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: January 5, 2010
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Nabil R. Yousef, Thomas J. Kolze, Gottfried Ungerboeck
  • Publication number: 20090327845
    Abstract: A system, method and computer program product is provided for mitigating the effects of burst noise on packets transmitted in a communications system. A transmitting device applies an outer code, which may include, for example, a block code, an exclusive OR (XOR) code, or a repetition code, to one or more packets prior to adaptation of the packets for transmission over the physical (PHY) layer of the communications system, wherein the PHY layer adaptation may include FEC encoding of individual packets. The outer coded packets are then separately transmitted over a channel of the communications system. A receiving device receives the outer coded packets, performs PHY level demodulation and optional FEC decoding of the packets, and then applies outer code decoding to the outer coded packets in order to restore packets that were erased during transmission due to burst noise or other impairments on the channel.
    Type: Application
    Filed: June 19, 2009
    Publication date: December 31, 2009
    Applicant: Broadcom Corporation
    Inventors: Bruce J. CURRIVAN, Thomas J. Kolze, Daniel H. Howard, Thomas J. Quigley, Nambi Seshadri, Thomas L. Johnson, Scott Cummings, James Harrell, Fred Bunn, Joel Danzig, Stephen Hughey
  • Patent number: 7631242
    Abstract: A system, method and computer program product is provided for mitigating the effects of burst noise on packets transmitted in a communications system. A transmitting device applies an outer code, which may include, for example, a block code, an exclusive OR (XOR) code, or a repetition code, to one or more packets prior to adaptation of the packets for transmission over the physical (PHY) layer of the communications system, wherein the PHY layer adaptation may include FEC encoding of individual packets. The outer coded packets are then separately transmitted over a channel of the communications system. A receiving device receives the outer coded packets, performs PHY level demodulation and optional FEC decoding of the packets, and then applies outer code decoding to the outer coded packets in order to restore packets that were erased during transmission due to burst noise or other impairments on the channel.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: December 8, 2009
    Assignee: Broadcom Corporation
    Inventors: Bruce J. Currivan, Thomas J. Kolze, Daniel H. Howard, Thomas J. Quigley, Nambi Seshadri, Thomas L. Johnson, Scott Cummings, Jay Harrell, Fred Bunn, Joel Danzig, Stephen Hughley
  • Publication number: 20090296664
    Abstract: Systems and methods are disclosed for detecting and mitigating temporary high-level impairments, in a communications channel, and subsequently, mitigating the deleterious effects of the dynamic impairments. The system includes a transmitter and a receiver. The transmitter is adapted to transmit at least one set of modulated signals. The receiver is adapted to receive the at least one set of modulated signals and mitigate temporary high-level impairment in the at least one set of modulated signals using at least one error vector received during the temporary high-level impairment.
    Type: Application
    Filed: August 4, 2009
    Publication date: December 3, 2009
    Inventor: Thomas J. Kolze
  • Publication number: 20090285343
    Abstract: A filter settings generation operation includes sampling a communication channel to produce a sampled signal. The sampled signal is spectrally characterized across a frequency band of interest to produce a spectral characterization of the sampled signal. This spectral characterization may not include a signal of interest. The spectral characterization is then modified to produce a modified spectral characterization. Filter settings are then generated based upon the modified spectral characterization. Finally, the communication channel is filtered using the filter settings when the signal of interest is present on the communication channel. In modifying the spectral characterization, pluralities of spectral characteristics of the spectral characterization are independently modified to produce the modified spectral characterization. Modifications to the spectral characterization may be performed in the frequency domain and/or the time domain.
    Type: Application
    Filed: July 27, 2009
    Publication date: November 19, 2009
    Applicant: BROADCOM CORPORATION
    Inventors: Thomas J. Kolze, Bruce J. Currivan, Jonathan S. Min, Eric Ojard, James Chi Thi, Daniel Howard
  • Patent number: 7602839
    Abstract: A system for mitigating impairment in a communication system includes a delay block, a signal level block, a moving average window block, an impulse noise detection block, and a combiner. The delay block receives and delays each chip of a plurality of chips in a spreading interval. The signal level block determines a signal level of each chip of the plurality of chips in the spreading interval. The moving average window block determines a composite signal level for a chip window corresponding to the chip. The impulse noise detection block receives the signal level, receives the composite signal level, and produces an erasure indication for each chip of the plurality of chips of the corresponding chip window. The combiner erases chips of the plurality of chips of the spreading interval based upon the erasure indication.
    Type: Grant
    Filed: April 26, 2008
    Date of Patent: October 13, 2009
    Assignee: Broadcom Corporation
    Inventors: Thomas J. Kolze, Nabil R. Yousef, Jonathan S. Min
  • Patent number: 7602867
    Abstract: Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients associated with a signal passed through the equalizer. The method also includes estimating un-equalized channel distortion based upon the determined adaptive filter coefficients.
    Type: Grant
    Filed: February 1, 2005
    Date of Patent: October 13, 2009
    Assignee: Broadcom Corporation
    Inventors: Thomas J. Kolze, Bruce J. Currivan
  • Patent number: 7599423
    Abstract: Successive interference canceling for CDMA. ICI may result from a signal's multi-path effects, or by filtering/suppression of some of the component energy of the signaling waveforms. Energy component attenuation destroys orthogonality of CDMA symbols thereby causing ICI. An ICF suppresses frequency domain portions(attenuates ingress), but also introduces ICI. Following the ICF, the signal is de-spread sliced, re-spread and convolved with the ICF echoes (except first tap echoes). Convolving re-spread hard decisions with delayed ICF taps is equivalent to partially re-modulating the first-pass hard decisions to efficiently “add-back-in” the signal energy which was blanked/subtracted by the ICF. Alternatively, parameter estimation de-rotates and re-rotates soft symbols and hard decisions, respectively, compensating for undesirable symbol rotation. The convolved signal is subtracted from a delayed version of the ICF output signal.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: October 6, 2009
    Assignee: Broadcom Corporation
    Inventors: Thomas J. Kolze, Nabil R. Yousef