Patents by Inventor Hungkei Chow
Hungkei Chow 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).
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Publication number: 20230224221Abstract: To dynamically allow chaining of logical processing units comprising endpoints, at least a type of an endpoint, and address information whereto connect the endpoint is configured, wherein the type of the endpoint is either a host port type or a logical processing unit type. During offloading from a central processing unit one or more functions to be performed by at least one further processing unit, the central processing unit is interacting with the one or more logical processing units via endpoints of the host port type and logical processing units are interacting via endpoints of the logical processing unit port type, the interaction using the address information.Type: ApplicationFiled: December 15, 2022Publication date: July 13, 2023Inventors: Hungkei CHOW, Michael JARSCHEL, Hasanin HARKOUS, Padmavathi SUDARSAN
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Patent number: 11489654Abstract: The communication device includes a transmitter for transmitting communication signals through a transmitter output terminal, a receiver for receiving communication signals through a receiver input terminal, and a coupling unit for coupling the transmitter output terminal and the receiver input terminal to the shared transmission medium, and including a first filter for passing communication signals from/to the shared transmission medium within a first communication frequency range, and a second filter for passing communication signals from/to the shared transmission medium within a second communication frequency range disjoint from the first communication frequency range.Type: GrantFiled: October 22, 2015Date of Patent: November 1, 2022Assignee: VECIMA NETWORKS INC.Inventors: Werner Coomans, Hungkei Chow
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Patent number: 10305435Abstract: In an example embodiment, a transceiver includes a plurality of amplifiers configured to amplify an analog transmit signal to generate a plurality of amplified transmit signals for further transmission, a combiner configured to combine a plurality of output signals to generate a combined signal, the plurality of output signals being based on the plurality of amplified transmit signals and at least one processor configured to execute computer-readable instructions to cause the transceiver to determine pre-distortion compensation coefficients based on the combined signal and generate a pre-distortion compensated transmit signal based on the pre-distortion compensation coefficients.Type: GrantFiled: May 3, 2018Date of Patent: May 28, 2019Assignee: NOKIA SOLUTIONS AND NETWORKS OYInventors: Rosanah Murugesu, Hungkei Chow, Werner Coomans
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Publication number: 20190052311Abstract: In an example embodiment, a full duplex transceiver includes an analog-to-digital converter (ADC), at least one processor, a first digital-to-analog converter (DAC) and an amplifier. The ADC is configured to convert an analog first signal to a digital first signal, the analog first signal being based on a transmitted signal from the transceiver and a received signal from a far-end transceiver. The at least one processor is configured to determine pre-distortion compensation coefficients using the digital first signal and a first input signal and generate a pre-distorted compensated input signal based on the pre-distortion compensation coefficients. The first DAC is configured to convert the pre-distortion compensated input signal to an analog input signal. The amplifier is configured to amplify the analog input signal to a subsequent transmit signal.Type: ApplicationFiled: August 8, 2017Publication date: February 14, 2019Applicant: Nokia Solutions and Networks OYInventors: Rosanah MURUGESU, Hungkei CHOW, Werner COOMANS
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Patent number: 10200167Abstract: The present invention relates to a method for assigning transmission resources (101) to communications between an access node (11) and a plurality of subscriber devices (41 to 46) coupled to a shared transmission medium. In accordance with an embodiment of the invention, the method comprises characterizing interference between respective ones of the plurality of subscriber devices over the shared transmission medium, grouping highly-interfering subscriber devices into respective interfering groups (G1, G2, G3, G4) based on the so-characterized interference, and assigning disjoint transmission time intervals to upstream communication from any one subscriber device of any one interfering group and to downstream communication towards any other subscriber device of the same interfering group. The present invention also relates to a resource controller.Type: GrantFiled: April 21, 2015Date of Patent: February 5, 2019Assignee: Alcatel LucentInventors: Werner Coomans, Hungkei Chow, Jochen Maes
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Publication number: 20180234228Abstract: The communication device includes a transmitter for transmitting communication signals through a transmitter output terminal, a receiver for receiving communication signals through a receiver input terminal, and a coupling unit for coupling the transmitter output terminal and the receiver input terminal to the shared transmission medium, and including a first filter for passing communication signals from/to the shared transmission medium within a first communication frequency range, and a second filter for passing communication signals from/to the shared transmission medium within a second communication frequency range disjoint from the first communication frequency range.Type: ApplicationFiled: October 22, 2015Publication date: August 16, 2018Applicant: Alcatel LucentInventors: Werner COOMANS, Hungkei CHOW
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Patent number: 9967035Abstract: Various embodiments of an optical transmitter and a method of operating an optical transmitter are disclosed. In one embodiment, the optical transmitter includes a laser and a laser driver configured to drive the laser using either a voltage driving topology (CDT) or a current-driving topology (VDT). The laser driver includes a switch that is configured to switch between the CDT and the CDT based on an operating frequency of the optical transmitter.Type: GrantFiled: April 21, 2016Date of Patent: May 8, 2018Assignee: Alcatel-Lucent USA Zinc.Inventors: Hungkei Chow, Jie Li, Ka Lun Lee
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Publication number: 20170222775Abstract: The present invention relates to a method for assigning transmission resources (101) to communications between an access node (11) and a plurality of subscriber devices (41 to 46) coupled to a shared transmission medium. In accordance with an embodiment of the invention, the method comprises characterizing interference between respective ones of the plurality of subscriber devices over the shared transmission medium, grouping highly-interfering subscriber devices into respective interfering groups (G1, G2, G3, G4) based on the so-characterized interference, and assigning disjoint transmission time intervals to upstream communication from any one subscriber device of any one interfering group and to downstream communication towards any other subscriber device of the same interfering group. The present invention also relates to a resource controller.Type: ApplicationFiled: April 21, 2015Publication date: August 3, 2017Applicant: Alcatel LucentInventors: Werner COOMANS, Hungkei CHOW, Jochen MAES
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Patent number: 9538266Abstract: An optical line terminal transmitter front-end, an optical network terminal receiver front-end and a bit-interleaved passive optical network (BIPON). In one embodiment, the transmitter front-end includes: (1) a bit interleaver configured to group and interleave a plurality of user bit-streams to yield a combined single bit-stream, (2) an encoder coupled to the bit interleaver and configured to encode multiple bits of the single bit-stream into a multi-level code corresponding to a 2m-level multi-level signal and (3) a multi-level modulator coupled to the encoder and configured to modulate the multi-level code into the 2m-level multi-level signal.Type: GrantFiled: March 9, 2015Date of Patent: January 3, 2017Assignee: Alcatel LucentInventors: Hungkei Chow, Vincent E. Houtsma, Doutje T. van Veen
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Publication number: 20160315713Abstract: Various embodiments of an optical transmitter and a method of operating an optical transmitter are disclosed. In one embodiment, the optical transmitter includes a laser and a laser driver configured to drive the laser using either a voltage driving topology (CDT) or a current-driving topology (VDT). The laser driver includes a switch that is configured to switch between the CDT and the CDT based on an operating frequency of the optical transmitter.Type: ApplicationFiled: April 21, 2016Publication date: October 27, 2016Inventors: Hungkei Chow, Jie Li, Ka Lun Lee
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Publication number: 20160269810Abstract: An optical line terminal transmitter front-end, an optical network terminal receiver front-end and a bit-interleaved passive optical network (BIPON). In one embodiment, the transmitter front-end includes: (1) a bit interleaver configured to group and interleave a plurality of user bit-streams to yield a combined single bit-stream, (2) an encoder coupled to the bit interleaver and configured to encode multiple bits of the single bit-stream into a multi-level code corresponding to a 2m-level multi-level signal and (3) a multi-level modulator coupled to the encoder and configured to modulate the multi-level code into the 2m-level multi-level signal.Type: ApplicationFiled: March 9, 2015Publication date: September 15, 2016Inventors: Hungkei Chow, Vincent E. Houtsma, Doutje T. van Veen
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Patent number: 9100506Abstract: In one embodiment, the line termination card includes a data output terminal configured to output a data sequence. The card further includes a vectoring entity configured to parse and encode the data sequence into frequency samples according to a carrier loading parameter, configured to scale the frequency samples into scaled frequency samples according to a carrier scaling parameter, and, configured to process the scaled frequency samples for crosstalk compensation. A controller is configured to adjust the carrier loading parameter and the carrier scaling parameter, and a forwarder is coupled to the data output terminal and to the controller. The forwarder is configured to forward the data sequence, the carrier loading parameter and the carrier scaling parameter towards a further line termination card.Type: GrantFiled: June 10, 2010Date of Patent: August 4, 2015Assignee: Alcatel LucentInventors: Hungkei Chow, Adriaan De Lind Van Wijngaarden, Michael Peeters, Dirk Vanderhaegen
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Patent number: 8971718Abstract: A clock and data recovery (CDR) circuit, a method of recovering a clock and data from a received raw data stream and a BI-PON optical network transceiver (ONT) receiver front-end incorporating the CDR circuit. In one embodiment, the CDR circuit includes: (1) a line rate CDR circuit having a voltage controlled oscillator, the line rate CDR circuit configured to recover a raw data stream at a receiving line rate, (2) a fixed-rate down-sampler coupled to the line rate CDR circuit and configured to down-sample the raw data stream based on a fixed-rate and (3) a variable-rate down-sampler coupled to the fixed-rate down-sampler and configured further to down-sample the raw data sample based on a variable-rate.Type: GrantFiled: June 1, 2012Date of Patent: March 3, 2015Assignee: Alcatel LucentInventors: Hungkei Chow, Dusan Suvakovic, Christophe Van Praet, Guy Torfs, Xin Yin, Zhisheng Li
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Publication number: 20130322885Abstract: A clock and data recovery (CDR) circuit, a method of recovering a clock and data from a received raw data stream and a BI-PON optical network transceiver (ONT) receiver front-end incorporating the CDR circuit. In one embodiment, the CDR circuit includes: (1) a line rate CDR circuit having a voltage controlled oscillator, the line rate CDR circuit configured to recover a raw data stream at a receiving line rate, (2) a fixed-rate down-sampler coupled to the line rate CDR circuit and configured to down-sample the raw data stream based on a fixed-rate and (3) a variable-rate down-sampler coupled to the fixed-rate down-sampler and configured further to down-sample the raw data sample based on a variable-rate.Type: ApplicationFiled: June 1, 2012Publication date: December 5, 2013Applicant: Alcatel-Lucent USA, Inc.Inventors: Hungkei Chow, Dusan Suvakovic, Christophe Van Praet, Guy Torfs, Xin Yin, Zhisheng Li
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Patent number: 8514687Abstract: An access node of a communication system is configured to control crosstalk between channels of the system. Vectoring circuitry in the access node estimates crosstalk between channels of the system, generates a compressed representation of the crosstalk estimates, and generates compensated signals based on the compressed representation of the crosstalk estimates. The compressed representation comprises a value array and an index array, with the value array comprising selected values from each of a plurality of rows of a matrix representation of the crosstalk estimates, and the index array identifying locations of the selected values in the matrix representation of the crosstalk estimates. The compensated signals may be pre-compensated signals or post-compensated signals.Type: GrantFiled: October 29, 2010Date of Patent: August 20, 2013Assignee: Alcatel LucentInventor: Hungkei Chow
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Publication number: 20120106315Abstract: An access node of a communication system is configured to control crosstalk between channels of the system. Vectoring circuitry in the access node estimates crosstalk between channels of the system, generates a compressed representation of the crosstalk estimates, and generates compensated signals based on the compressed representation of the crosstalk estimates. The compressed representation comprises a value array and an index array, with the value array comprising selected values from each of a plurality of rows of a matrix representation of the crosstalk estimates, and the index array identifying locations of the selected values in the matrix representation of the crosstalk estimates. The compensated signals may be pre-compensated signals or post-compensated signals.Type: ApplicationFiled: October 29, 2010Publication date: May 3, 2012Inventor: Hungkei Chow
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Publication number: 20120057693Abstract: In one embodiment, the line termination card includes a data output terminal configured to output a data sequence. The card further includes a vectoring entity configured to parse and encode the data sequence into frequency samples according to a carrier loading parameter, configured to scale the frequency samples into scaled frequency samples according to a carrier scaling parameter, and, configured to process the scaled frequency samples for crosstalk compensation. A controller is configured to adjust the carrier loading parameter and the carrier scaling parameter, and a forwarder is coupled to the data output terminal and to the controller. The forwarder is configured to forward the data sequence, the carrier loading parameter and the carrier scaling parameter towards a further line termination card.Type: ApplicationFiled: June 10, 2010Publication date: March 8, 2012Applicant: ALCATEL LUCENTInventors: Hungkei Chow, Adriaan De Lind Van Wijngaarden, Michael Peeters, Dirk Vanderhaegen
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Patent number: 8018868Abstract: The present invention relates to a crosstalk estimation device for estimating crosstalk between communication lines in a precoding group. The crosstalk estimation device comprises transmission means for transmitting a pilot sequence and reception means for receiving error feedback on one or more communication lines in the precoding group. The crosstalk estimation device further comprises crosstalk estimation means for combining the pilot sequence with the error feedback in order to obtain a crosstalk estimation between the communication lines. The device further comprises selection means for selecting a subset of one or more communication lines from the precoding group. The transmission means are adapted to transmit the pilot sequence only on the subset.Type: GrantFiled: June 10, 2009Date of Patent: September 13, 2011Assignee: Alcatel LucentInventors: Carl J. Nuzman, Adriaan J. de Lind van Wijngaarden, Philip A. Whiting, Jochen J. M. Maes, Gerhard G. T. Kramer, Hungkei Chow, Alexei E. Ashikhmin
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Publication number: 20090310502Abstract: The present invention relates to a crosstalk estimation device for estimating crosstalk between communication lines in a precoding group. The crosstalk estimation device comprises transmission means for transmitting a pilot sequence and reception means for receiving error feedback on one or more communication lines in the precoding group. The crosstalk estimation device further comprises crosstalk estimation means for combining the pilot sequence with the error feedback in order to obtain a crosstalk estimation between the communication lines. The device further comprises selection means for selecting a subset of one or more communication lines from the precoding group. The transmission means are adapted to transmit the pilot sequence only on the subset.Type: ApplicationFiled: June 10, 2009Publication date: December 17, 2009Inventors: Carl J. Nuzman, Adriaan J. de Lind van Wijngaarden, Philip A. Whiting, Jochen J. M. Maes, Gerhard G.T. Kramer, Hungkei Chow, Alexei E. Ashikhmin
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Publication number: 20060133809Abstract: Systems and techniques for multiple bit rate optical data transmission. A passive optical network includes an optical line termination unit (OLT) connected to one or more optical network units (ONUs) by optical elements. The OLT is capable of performing downstream transmission to the ONUs at each of a variety of different bit rates, and each ONU performs upstream transmission at one or more bit rates. The OLT can sense a bit rate of a received transmission and change its operation so as to receive and process the transmission exhibiting the sensed bit rate. Each of the ONUs receives and processes downstream transmissions at one or more bit rates, but each ONU is capable of maintaining a phase and frequency lock to downstream transmissions at all bit rates supported by the OLT. One or more of the ONUs may also receive and process downstream transmissions exhibiting different or changed bit rates.Type: ApplicationFiled: December 17, 2004Publication date: June 22, 2006Applicant: Lucent Technologies, Inc.Inventors: Hungkei Chow, Manyalibo Matthews, Dusan Suvakovic, Doutje Van Veen