Patents by Inventor Hans van Driest

Hans van Driest 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: 20190140629
    Abstract: Phase detector circuitry includes oscillator circuitry, edge detection and correction circuitry, sampler circuitry, and adder circuitry. The oscillator circuitry is configured to provide a sawtooth oscillator signal. The edge detection and correction circuitry is configured to receive an in-phase signal and a quadrature signal, provide an edge detection signal during each edge of the in-phase signal and the quadrature signal, and provide an edge correction signal based on whether the edge is in the in-phase signal or the quadrature signal and whether the edge is a rising edge or a falling edge. The sampler circuitry is configured to sample the sawtooth oscillator signal in response to the edge detection signal. The adder circuitry is configured to subtract the edge correction signal from the sampled sawtooth oscillator signal to provide a phase estimate signal.
    Type: Application
    Filed: October 30, 2018
    Publication date: May 9, 2019
    Inventor: Hans Van Driest
  • Publication number: 20180324829
    Abstract: Method for receiving data packet transmissions, wherein synchronization with a transmitter is accomplished based on detection of a preamble transmitted by the transmitter. A time multiplexing scheduling of a single hardware receiver arrangement is used, and the time multiplexing scheduling has a main time slot comprising a first listen period and a second listen period following the first listen period. In the first listen period a first type of synchronization detection is executed (e.g. IEEE 802.15.4), and in the second listen period a second type of synchronization detection different from the first type of synchronization detection is executed (e.g. BLE).
    Type: Application
    Filed: November 12, 2015
    Publication date: November 8, 2018
    Inventors: Hans Van Driest, Andrew Fort, Bram van den Bosch
  • Publication number: 20180131476
    Abstract: Multi-channel listening capable receiver capable of operating on one of K data channels and method of operating such a receiver. A local oscillator (2) is provided for tuning the receiver (1) to one of the channels within a channel switching time Ts, as well as a processing unit (9) arranged to detect a presence of a preamble on the tuned channel. The processing unit (9) is further arranged to switch over the local oscillator (2) to a next one of the data channels if no presence of a preamble is detected within a single preamble symbol duration Tp. The channel switching time is a fraction ? of a single preamble symbol period Tp. The number of data channels K fulfills the condition K<floor (N?1?(K*?)) to be able to receive all relevant data packets on the K channels, after being triggered by reception of the preamble.
    Type: Application
    Filed: April 16, 2015
    Publication date: May 10, 2018
    Inventors: Hans Van Driest, Bram van den Bosch, Wilhelmus van Hoogstraeten
  • Patent number: 9166602
    Abstract: A transceiver 1 includes a frequency synthesizer 2 configured to generate an output signal 3 for use as a carrier signal for transmission and/or a signal with a channel frequency for reception, wherein the frequency synthesizer is a sub-sampling based frequency locked loop frequency synthesizer. The combination of a FLL and sub-sampling allows to obtain a sub-sample based locked loop with a closed loop response similar to a PLL but with improved settling time and improved suppression of high frequency components of the quantization noise due to the sampling process. The transceiver allows to obtain a frequency synthesizer with improved characteristics with respect to at least one of power consumption, locking characteristic, design optimization characteristics compared to non-sub-sampling PLL based frequency synthesizers.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: October 20, 2015
    Assignee: GREENPEAK TECHNOLOGIES B.V.
    Inventor: Hans Van Driest
  • Patent number: 8995506
    Abstract: Disclosed is a transceiver including a sub-sampling based frequency synthesizer with a sampling frequency fsmp, configured to generate M different output signals 3 for use as a carrier signal for transmission and/or a signal with a channel frequency for reception. M is an integer greater than 4, each output signal has a corresponding predefined frequency. The predefined frequencies are within a frequency band with a predefined bandwidth CFR. CFR is greater than fsmp. The frequency synthesizer includes a frequency shift unit configured for shifting a version of the output signal over a predefined frequency shift fshift to obtain a frequency shifted signal which is supplied to a sampling unit of the sub-sampling based frequency synthesizer, wherein ?fsmp/2?fshift?+fsmp/2. The frequency shift unit is configured to use for the generation of each of the N different output signals a corresponding predefined frequency shift fshift.
    Type: Grant
    Filed: December 31, 2010
    Date of Patent: March 31, 2015
    Assignee: Greenpeak Technologies B.V.
    Inventors: Anton Willem Roodnat, Hans Van Driest, Jan Hendrik Haanstra
  • Publication number: 20140036970
    Abstract: Disclosed is a transceiver including a sub-sampling based frequency synthesizer with a sampling frequency fsmp, configured to generate M different output signals 3 for use as a carrier signal for transmission and/or a signal with a channel frequency for reception. M is an integer greater than 4, each output signal has a corresponding predefined frequency. The predefined frequencies are within a frequency band with a predefined bandwidth CFR. CFR is greater than fsmp. The frequency synthesizer includes a frequency shift unit configured for shifting a version of the output signal over a predefined frequency shift fshift to obtain a frequency shifted signal which is supplied to a sampling unit of the sub-sampling based frequency synthesizer, wherein ?fsmp/2?fshift?+fsmp/2. The frequency shift unit is configured to use for the generation of each of the N different output signals a corresponding predefined frequency shift fshift.
    Type: Application
    Filed: December 31, 2010
    Publication date: February 6, 2014
    Applicant: Greenpeak Tecnologies B.V.
    Inventors: Anton Willem Roodnat, Hans Van Driest, Jan Hendrik Haanstra
  • Patent number: 8531981
    Abstract: A receiver and method for determining a characteristic from an input signal is disclosed. A characteristic is at least one selected from a group comprising preamble detect, frequency offset and timing offset. The input signal comprises an IF frequency fIF and a preamble signal which is a sequence of M similar data symbols. The data symbols have a symbol period SP, and M is an integer greater than or equal to 2. The method comprises: —receiving N subsequent samples of the input signal, the N subsequent samples representing a part of the input signal approximating the symbol period SP, —rotating N subsequent samples to obtain N rotated symbols; —correlating the N rotated symbols with P correlation functions to generate a set of N×P correlation values, P being an integer greater than or equal to 2; and, —selecting a maximum correlation value from the set of N×P correlation values and determining the characteristic.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: September 10, 2013
    Assignee: Greenpeak Technologies B.V.
    Inventors: Hans Van Driest, Wessel Harm Lubberhuizen
  • Publication number: 20130005276
    Abstract: A transceiver 1 includes a frequency synthesizer 2 configured to generate an output signal 3 for use as a carrier signal for transmission and/or a signal with a channel frequency for reception, wherein the frequency synthesizer is a sub-sampling based frequency locked loop frequency synthesizer. The combination of a FLL and sub-sampling allows to obtain a sub-sample based locked loop with a closed loop response similar to a PLL but with improved settling time and improved suppression of high frequency components of the quantization noise due to the sampling process. The transceiver allows to obtain a frequency synthesizer with improved characteristics with respect to at least one of power consumption, locking characteristic, design optimization characteristics compared to non-sub-sampling PLL based frequency synthesizers.
    Type: Application
    Filed: March 24, 2010
    Publication date: January 3, 2013
    Applicant: GREENPEAK TECHNOLOGIES B.V.
    Inventor: Hans Van Driest
  • Patent number: 8189715
    Abstract: A receiver and method for receiving symbols having a symbol period with duration SP comprising. N antenna signals are selected equally in time over a symbol period to obtain a combined antenna signal. An autocorrelation is performed on the combined antenna signal to obtain a combined signal. The combined signal is split into the corresponding antenna signal parts and subjected to an integration function. The output of the integration function is used the select the antenna signal with the best signal quality. The invention enables to perform an efficient antenna diversity circuit, which can partially be used for simultaneously preamble detection and frequency offset estimation.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: May 29, 2012
    Assignee: Greenpeak Technologies B.V.
    Inventors: Hans van Driest, Cornelis Adrianus Henricus Maria van Puijenbroek
  • Publication number: 20110051612
    Abstract: A receiver and method for determining a characteristic from an input signal is disclosed. A characteristic is at least one selected from a group comprising preamble detect, frequency offset and timing offset. The input signal comprises an IF frequency fIF and a preamble signal which is a sequence of M similar data symbols. The data symbols have a symbol period SP, and M is an integer greater than or equal to 2. The method comprises: -receiving N subsequent samples of the input signal, the N subsequent samples representing a part of the input signal approximating the symbol period SP, -rotating N subsequent samples to obtain N rotated symbols; -correlating the N rotated symbols with P correlation functions to generate a set of N×P correlation values, P being an integer greater than or equal to 2; and, -selecting a maximum correlation value from the set of N×P correlation values and determining the characteristic.
    Type: Application
    Filed: January 25, 2008
    Publication date: March 3, 2011
    Applicant: GREENPEAK TECHNOLOGIES B.V.
    Inventors: Hans Van Driest, Wessel Harm Lubberhuizen
  • Publication number: 20100034326
    Abstract: A receiver and method for receiving symbols having a symbol period with duration SP comprising. N antenna signals are selected equally in time over a symbol period to obtain a combined antenna signal. An autocorrelation is performed on the combined antenna signal to obtain a combined signal. The combined signal is split into the corresponding antenna signal parts and subjected to an integration function. The output of the integration function is used the select the antenna signal with the best signal quality. The invention enables to perform an efficient antenna diversity circuit, which can partially be used for simultaneously preamble detection and frequency offset estimation.
    Type: Application
    Filed: July 12, 2006
    Publication date: February 11, 2010
    Applicant: GREENPEAK TECHNOLOGIES B.V.
    Inventors: Hans van Driest, Cornelis Adrianus Henricus Maria van Puijenbroek
  • Patent number: 7421038
    Abstract: In one embodiment, a method of transmitting data from a transmitter in a wireless local area network (WLAN), where the transmitter has a timer and a modem. The transmitter periodically transmits a transmission signal that includes a timestamp field that includes a timestamp for synchronizing a receiver timer in a receiver of the WLAN. The timestamp, which represents a value within the count sequence of the transmitter timer, accounts for delays in the modem.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: September 2, 2008
    Assignee: Agere Systems Inc.
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Publication number: 20080037467
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Application
    Filed: July 11, 2007
    Publication date: February 14, 2008
    Applicant: AGERE SYSTEMS INC.
    Inventors: Wilhelmus Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Patent number: 7289578
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Grant
    Filed: January 13, 2006
    Date of Patent: October 30, 2007
    Assignee: Agere Systems Inc.
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Patent number: 7010058
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: March 7, 2006
    Assignee: Agere Systems Inc.
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Publication number: 20040071246
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Application
    Filed: October 9, 2003
    Publication date: April 15, 2004
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Patent number: 6707867
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Grant
    Filed: March 7, 2002
    Date of Patent: March 16, 2004
    Assignee: Agere Systems, Inc.
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Publication number: 20020131484
    Abstract: A wireless local area network apparatus includes a transmitter and a receiver in which operation of the receiver is accurately synchronized with periodic signals from the transmitter. The periodic signals contain timing data indicating the state of a timer in the transmitter at the time the signal containing that data was transmitted and this timing data is retrieved from the signal when received by the receiver and loaded in a timer for controlling operation of the receiver.
    Type: Application
    Filed: March 7, 2002
    Publication date: September 19, 2002
    Inventors: Wilhelmus J. M. Diepstraten, Hendrik van Bokhorst, Hans van Driest
  • Patent number: 6314145
    Abstract: The timing of a carrier signal is tracked in a receiver. The receiver receives a signal produced by a transmitter having a single frequency source which is used to generate a reference clock frequency and a carrier signal frequency, there being a fixed, predetermined relationship between the reference and carrier frequencies. In the receiver there is a single frequency source which is used to generate a reference clock frequency and a carrier reference signal frequency, there being a fixed, predetermined relationship between the reference and carrier reference frequencies. The fixed, predetermined relationship in the transmitter and the receiver is the same.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: November 6, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventor: Hans van Driest
  • Patent number: 6115411
    Abstract: A system for, and method of, generating a spread spectrum code position modulated waveform and a wireless local area network (LAN) containing the system or the method. The system includes: (1) a spread-spectrum encoder that receives and encodes portions of an information signal with a multi-chip code having a predetermined length to create therefrom a stream of sequences, each of the sequences having the predetermined length and (2) a transmitter that periodically transmits the each of the sequences at a time interval that differs from the predetermined length, a data rate of transmission of the information signal thereby allowed to increase.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: September 5, 2000
    Assignee: Lucent Technologies, Inc.
    Inventor: Hans van Driest