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公开(公告)号：US20200313705A1
公开(公告)日：2020-10-01
申请号：US16362917
申请日：2019-03-25
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin
Abstract: Echo Cancellation (EC) training for a Full Duplex (FDX) amplifier may be provided. First, a Downstream (DS) signal at a fixed location on a subcarrier frequency may be received. Next, an Upstream (US) echo may be determined from the received DS signal at the fixed location on the subcarrier frequency. Determining the upstream echo may comprise subtracting a known value from the received DS signal at the fixed location on the subcarrier frequency. An Echo Cancelation (EC) coefficient may then be determined. Determining the EC coefficient may comprise dividing the determined US echo by a reference signal comprising an US signal. Next, EC may be performed. Performing EC may comprise subtracting the echo from the DS signal.
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公开(公告)号：US20200244431A1
公开(公告)日：2020-07-30
申请号：US16258196
申请日：2019-01-25
Applicant: Cisco Technology, Inc.
Inventor： Tong Liu , John T. Chapman , Hang Jin
IPC: H04L5/14 , H04L12/803 , H04L12/819 , H04L12/28
Abstract: 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.
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公开(公告)号：US10574356B2
公开(公告)日：2020-02-25
申请号：US15880687
申请日：2018-01-26
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Hang Jin , Alon Shlomo Bernstein
IPC: H04B10/2575 , H04W88/08 , H04W92/02
Abstract: 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.
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公开(公告)号：US10567036B2
公开(公告)日：2020-02-18
申请号：US16012504
申请日：2018-06-19
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Hang Jin , Tong Liu
Abstract: 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.
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公开(公告)号：US10541723B2
公开(公告)日：2020-01-21
申请号：US16005323
申请日：2018-06-11
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin
Abstract: 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.
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Patent Agency Ranking
公开(公告)号：US20190326950A1
公开(公告)日：2019-10-24
申请号：US15957079
申请日：2018-04-19
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
IPC: H04B3/23
Abstract: 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.
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公开(公告)号：US10367699B2
公开(公告)日：2019-07-30
申请号：US15372259
申请日：2016-12-07
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin
Abstract: An example system for Predictive Services Management (PSM) in cable network environments is provided and includes a data collector located in a cable network that captures multi-tone signals traversing the cable network, a data repository located in a cloud network, and a central server having PSM algorithms configured for: retrieving key performance indicators from the multi-tone signals; identifying a fault signature based on the key performance indicators, the fault signature being identified based on phase domain analysis of a channel response; accessing the data repository for geographical information; determining a location of a fault in the cable network based on the fault signature and the geographical information; accessing the data repository for device information; determining a type of fault based on the location of the fault and the device information; and activating repair and maintenance activities based on the type of fault, location of the fault and the fault signature.
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公开(公告)号：US10033542B2
公开(公告)日：2018-07-24
申请号：US15052466
申请日：2016-02-24
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin , John T. Chapman
IPC: H04L5/14 , H04L12/28 , H04L1/00 , H04L12/931
CPC classification number: H04L12/2801 , H04L1/004 , H04L5/1438 , H04L49/70
Abstract: An example method for scheduling in full duplex cable network environments is provided and includes categorizing a plurality of cable modems in a cable network into interference groups, scheduling upstream transmissions and downstream receptions for cable modems in each interference group, such that no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, generating scheduling information of the scheduling, and transmitting the scheduling information to the cable modems.
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公开(公告)号：US09942024B2
公开(公告)日：2018-04-10
申请号：US15052428
申请日：2016-02-24
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin , John T. Chapman
CPC classification number: H04L5/1461 , H04B3/20 , H04L12/2801
Abstract: An example communication system comprises a media access control (MAC) scheduler in a cable network, and a full band transceiver. The MAC scheduler implements a two-dimensional transmission-reception (T-R) coordination scheme among a plurality of cable modems in the cable network. According to the T-R coordination scheme, the cable modems are categorized into interference groups, such that no cable modem of any one interference group transmits upstream in a frequency range simultaneously as another cable modem in the same interference group receives downstream in the frequency range, facilitating full duplex communication in the cable network across the frequency range. The full band transceiver implements an adaptive interference cancellation scheme, which suppresses at a receiver of the respective component, a signal transmitted by a transmitter of the respective component. The communication system further includes a full band amplifier, implementing the adaptive interference cancellation scheme and a ringing suppression scheme with echo cancellation.
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公开(公告)号：US20170310541A1
公开(公告)日：2017-10-26
申请号：US15397603
申请日：2017-01-03
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin
CPC classification number: H04B3/46 , G01R31/3181 , G01R31/31937 , H04B3/142 , H04B3/493 , H04B3/52 , H04L5/0005 , H04L27/2647 , H04L41/0631 , H04L41/0677 , H04L41/0686 , H04L41/147 , H04L43/10 , H04L43/16 , H04L67/1097 , H04L2012/6421 , H04Q2213/13012
Abstract: One embodiment is a system including a data collector located in a cable network for capturing multi-tone signals traversing the cable network; a data repository located in a cloud network and having an interface for communicating with the data collector and for storing the multi-tone signals captured by the data collector and network data associated with the cable network; and a central server including a memory element storing Predictive Services Management (PSM) algorithms comprising instructions and associated data and a processor operable to execute the PSM algorithms. The central server is configured for detecting a fault in the cable network and identifying a segment associated with the fault; determining a maximum tap magnitude for the fault; calculating an aggregate tap magnitude for the fault; and classifying a severity of the fault based at least in part on the maximum tap magnitude and the aggregate tap magnitude.
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