Patents by Inventor Hang Jin
Hang Jin 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: 20200244431Abstract: A system to support Time Division Duplex (TDD) Full Duplex (FDX) with a remote Duty Cycle (DS) framer may be provided. The system may comprise a core and a Remote PHY Device (RPD). The core may comprise a Downstream (DS) Quality-of-Service (QoS) scheduler and a DS duty cycle rate regulator. The DS duty cycle rate regulator may comprise a plurality of token buckets and a plurality of data framing queues. The RPD may comprise a plurality of TG queue blocks and switching logic.Type: ApplicationFiled: January 25, 2019Publication date: July 30, 2020Applicant: Cisco Technology, Inc.Inventors: Tong Liu, John T. Chapman, Hang Jin
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Patent number: 10720961Abstract: Echo cancellation may be provided. First, a feedback signal corresponding to a plurality of downstream paths may be received. Next, during an upstream silence period, a sample of a combination upstream signal may be received comprising a combination of upstream signals from a plurality of upstream paths. An echo correcting signal may then be created using the received feedback signal and the received sample of the combination upstream signal. Downstream echoes may be cancel from the combination upstream signal based on the created echo correcting signal.Type: GrantFiled: April 3, 2018Date of Patent: July 21, 2020Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20200186192Abstract: Echo cancellation to alleviate timing varying channels may be provided. First, a feedback signal corresponding to one of a plurality of downstream paths and a combination upstream signal comprising a combination of upstream signals from a plurality of upstream paths may be received. Next, a plurality of echo corrected signals may be created using the feedback signal, the combination upstream signal, and a plurality of echo cancelation coefficients that each respectively correspond to each one of the plurality of echo corrected signals and that are different from each other. Then a one of the plurality of echo cancelation coefficients that corresponds to a one of the plurality of echo corrected signals that provides a best echo cancelation performance as compared to other ones of the plurality of echo corrected signals may be selected to use.Type: ApplicationFiled: February 17, 2020Publication date: June 11, 2020Applicant: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, Tong Liu
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Patent number: 10574356Abstract: A virtual physical layer may be provided. When providing the virtual physical layer, a remote radio head may be used. The remote radio head may comprise a first interface device, a second interface device, a digital-to-analog converter, and an analog-to-digital converter. The first interface device may be connected to a virtual physical layer instance instantiated in a cloud-based environment. The second interface device may be connected to customer premises equipment. The digital-to-analog converter may be connected between the first interface device and the second interface device and the analog-to-digital converter may also be connected between the first interface device and the second interface device.Type: GrantFiled: January 26, 2018Date of Patent: February 25, 2020Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, Alon Shlomo Bernstein
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Patent number: 10567036Abstract: Echo cancellation to alleviate timing varying channels may be provided. First, a feedback signal corresponding to one of a plurality of downstream paths and a combination upstream signal comprising a combination of upstream signals from a plurality of upstream paths may be received. Next, a plurality of echo corrected signals may be created using the feedback signal, the combination upstream signal, and a plurality of echo cancelation coefficients that each respectively correspond to each one of the plurality of echo corrected signals and that are different from each other. Then a one of the plurality of echo cancelation coefficients that corresponds to a one of the plurality of echo corrected signals that provides a best echo cancelation performance as compared to other ones of the plurality of echo corrected signals may be selected to use.Type: GrantFiled: June 19, 2018Date of Patent: February 18, 2020Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, Tong Liu
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Patent number: 10541723Abstract: Reduce echo level may be provided by scrambling phases of echoes from multiple ports in a Full Duplex (FDX) node. The FDX node may comprise a transmit portion, a receive portion, and a plurality of ports. The transmit portion may comprise a transmit portion transmit port and a plurality of splitters. The receive portion may comprise a receive portion receive port and a plurality of combiners. The plurality of splitters and the plurality of combiners may scramble phases of completed loops from the transmit portion transmit port to the receive portion receive port resulting from reflections from the plurality of ports.Type: GrantFiled: June 11, 2018Date of Patent: January 21, 2020Assignee: Cisco Technology, Inc.Inventor: Hang Jin
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Patent number: 10536667Abstract: An embodiment of a method includes determining a channel signature for each of a plurality of cable devices associated with a selected household; determining whether at least one of the channel signatures is substantially different than the remaining ones of the channel signatures; and if at least one of the channel signatures is substantially different than the remaining ones of the channel signatures, flagging the selected household for potential theft of services review. Additional embodiments may include determining a radio frequency (“RF”) signal power level for each of the cable devices; calculating a sum of the determined RF signal power levels; determining whether the calculated sum is equal to an RF power signal level measured at a tap of the selected household; and if the calculated sum is not equal to the measured RF power signal level, flagging the selected household for potential theft of services review.Type: GrantFiled: June 17, 2017Date of Patent: January 14, 2020Assignee: Cisco Technology, Inc.Inventors: Alon Shlomo Bernstein, Hang Jin
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Patent number: 10530310Abstract: Digital pre-distortion may be provided. First, a radio frequency (RF) domain distortion correcting signal and a base band (BB) domain distortion correcting signal may be initialized. Then the RF domain distortion correcting signal may be generated from an input signal. The generated RF domain distortion correcting signal may correspond to an amplifier. Next, the BB domain distortion correcting signal may be generated from the input signal. The generated BB domain distortion correcting signal may correspond to the amplifier. Then the RF domain distortion correcting signal and the BB domain distortion correcting signal may be combined to form a hybrid distortion correcting signal. The hybrid distortion correcting signal may then be provided to input matching circuitry feeding the amplifier.Type: GrantFiled: April 19, 2018Date of Patent: January 7, 2020Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Patent number: 10523270Abstract: Full Duplex (FDX) enhanced node deployment may be provided. First, a first device level may be provided comprising a first plurality of FDX enhanced nodes. The first plurality of FDX enhanced nodes may comprise a first FDX enhanced node and a second FDX enhanced node. The first plurality of FDX enhanced nodes may be operated in a first mode. Next, a second device level may be provided comprising a third FDX enhanced node. The second device level may be upstream from the first device level. The third FDX enhanced node may be operated in a second mode. Then an input port of the first FDX enhanced node and an input port of the second FDX enhanced node may be provided with a same type of input that is being provided to an input port of the third FDX enhanced node. The first plurality of FDX enhanced nodes may then be switched from being operated in the first mode to being operated in the second mode.Type: GrantFiled: June 14, 2018Date of Patent: December 31, 2019Assignee: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, John Holobinko, Yubin Chen, John Alexander Ritchie, Jr., Martin Mattingly
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Patent number: 10516435Abstract: Detection of a device connected to a network element may be provided. First, upstream allocation data corresponding to the device may be received. Next, active minislot data detected at the network element may be received. It may then be determined that the upstream allocation data and the active minislot data correlate. In response to determining that the upstream allocation data and the active minislot data correlate, it may be determined that the device is attached to the network element.Type: GrantFiled: November 7, 2018Date of Patent: December 24, 2019Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman, Tong Liu
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Publication number: 20190386700Abstract: Full Duplex (FDX) enhanced node deployment may be provided. First, a first device level may be provided comprising a first plurality of FDX enhanced nodes. The first plurality of FDX enhanced nodes may comprise a first FDX enhanced node and a second FDX enhanced node. The first plurality of FDX enhanced nodes may be operated in a first mode. Next, a second device level may be provided comprising a third FDX enhanced node. The second device level may be upstream from the first device level. The third FDX enhanced node may be operated in a second mode. Then an input port of the first FDX enhanced node and an input port of the second FDX enhanced node may be provided with a same type of input that is being provided to an input port of the third FDX enhanced node. The first plurality of FDX enhanced nodes may then be switched from being operated in the first mode to being operated in the second mode.Type: ApplicationFiled: June 14, 2018Publication date: December 19, 2019Applicant: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, John Holobinko, Yubin Chen, John Alexander Ritchie, JR., Martin Mattingly
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Publication number: 20190386701Abstract: Echo cancellation to alleviate timing varying channels may be provided. First, a feedback signal corresponding to one of a plurality of downstream paths and a combination upstream signal comprising a combination of upstream signals from a plurality of upstream paths may be received. Next, a plurality of echo corrected signals may be created using the feedback signal, the combination upstream signal, and a plurality of echo cancelation coefficients that each respectively correspond to each one of the plurality of echo corrected signals and that are different from each other. Then a one of the plurality of echo cancelation coefficients that corresponds to a one of the plurality of echo corrected signals that provides a best echo cancelation performance as compared to other ones of the plurality of echo corrected signals may be selected to use.Type: ApplicationFiled: June 19, 2018Publication date: December 19, 2019Applicant: Cisco Technology, Inc.Inventors: John T. Chapman, Hang Jin, Tong Liu
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Publication number: 20190379423Abstract: Reduce echo level may be provided by scrambling phases of echoes from multiple ports in a Full Duplex (FDX) node. The FDX node may comprise a transmit portion, a receive portion, and a plurality of ports. The transmit portion may comprise a transmit portion transmit port and a plurality of splitters. The receive portion may comprise a receive portion receive port and a plurality of combiners. The plurality of splitters and the plurality of combiners may scramble phases of completed loops from the transmit portion transmit port to the receive portion receive port resulting from reflections from the plurality of ports.Type: ApplicationFiled: June 11, 2018Publication date: December 12, 2019Applicant: Cisco Technology, Inc.Inventor: Hang Jin
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Patent number: 10476448Abstract: Digital pre-distortion may be provided. First, a characterization for input matching circuitry may be determined. Next, a characterization for non-linearity of an amplifier connected to the input matching circuitry may be determined. Then, a distortion correcting signal may be generated from an input signal based on the determined characterization for the input matching circuitry and the determined characterization for the non-linearity of the amplifier. The generated distortion correcting signal may then be provided to the input matching circuitry.Type: GrantFiled: April 19, 2018Date of Patent: November 12, 2019Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Patent number: 10469128Abstract: Analog echo cancellation with Digital-to-Analog Converter (DAC) noise suppression may be provided. First, a test signal may be sent through an echo cancellation pathway during a downstream silence period and an upstream silence period. The echo cancellation pathway may comprise an electronic element. Next, a loopback response signal may be received in response to sending the test signal through the echo cancellation pathway. Then a channel response model may be created that characterizes a channel response of the loopback response signal and a non-linear model may be created that characterizes a non-linearity of the electronic element. Next, for a downstream signal, a non-linear component may be generated based on the created non-linear model. The generated non-linear component may be convolved with the created channel response model. The convolved non-linear component may then be subtracted from an upstream signal.Type: GrantFiled: April 19, 2018Date of Patent: November 5, 2019Assignee: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20190326860Abstract: Digital pre-distortion may be provided. First, a characterization for input matching circuitry may be determined. Next, a characterization for non-linearity of an amplifier connected to the input matching circuitry may be determined. Then, a distortion correcting signal may be generated from an input signal based on the determined characterization for the input matching circuitry and the determined characterization for the non-linearity of the amplifier. The generated distortion correcting signal may then be provided to the input matching circuitry.Type: ApplicationFiled: April 19, 2018Publication date: October 24, 2019Applicant: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20190326861Abstract: Digital pre-distortion may be provided. First, a radio frequency (RF) domain distortion correcting signal and a base band (BB) domain distortion correcting signal may be initialized. Then the RF domain distortion correcting signal may be generated from an input signal. The generated RF domain distortion correcting signal may correspond to an amplifier. Next, the BB domain distortion correcting signal may be generated from the input signal. The generated BB domain distortion correcting signal may correspond to the amplifier. Then the RF domain distortion correcting signal and the BB domain distortion correcting signal may be combined to form a hybrid distortion correcting signal. The hybrid distortion correcting signal may then be provided to input matching circuitry feeding the amplifier.Type: ApplicationFiled: April 19, 2018Publication date: October 24, 2019Applicant: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20190326949Abstract: Ringing suppression may be provided. First, a first ringing suppressor in a first branch of an amplifier may cancel interference from a second branch of the amplifier using a transmitted signal from the second branch as a reference. The first ringing suppressor may also cancel echo interference from the first branch of the amplifier using an output of the first ringing suppressor in the first branch as a reference. Furthermore, a second ringing suppressor in the second branch of the amplifier may cancel interference from the first branch of the amplifier using a transmitted signal from the first branch as a reference. Furthermore, the second ringing suppressor may cancel echo interference from the second branch of the amplifier using an output of the second ringing suppressor in the second branch as a reference.Type: ApplicationFiled: April 19, 2018Publication date: October 24, 2019Applicant: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20190326950Abstract: Analog echo cancellation with Digital-to-Analog Converter (DAC) noise suppression may be provided. First, a test signal may be sent through an echo cancelation pathway during a downstream silence period and an upstream silence period. The echo cancelation pathway may comprise an electronic element. Next, a loopback response signal may be received in response to sending the test signal through the echo cancelation pathway. Then a channel response model may be created that characterizes a channel response of the loopback response signal and a non-linear model may be created that characterizes a non-linearity of the electronic element. Next, for a downstream signal, a non-linear component may be generated based on the created non-linear model. The generated non-linear component may be convolved with the created channel response model. The convolved non-linear component may then be subtracted from an upstream signal.Type: ApplicationFiled: April 19, 2018Publication date: October 24, 2019Applicant: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman
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Publication number: 20190305815Abstract: Echo cancellation may be provided. First, a feedback signal corresponding to a plurality of downstream paths may be received. Next, during an upstream silence period, a sample of a combination upstream signal may be received comprising a combination of upstream signals from a plurality of upstream paths. An echo correcting signal may then be created using the received feedback signal and the received sample of the combination upstream signal. Downstream echoes may be cancel from the combination upstream signal based on the created echo correcting signal.Type: ApplicationFiled: April 3, 2018Publication date: October 3, 2019Applicant: Cisco Technology, Inc.Inventors: Hang Jin, John T. Chapman