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公开(公告)号：US20150146712A1
公开(公告)日：2015-05-28
申请号：US14091719
申请日：2013-11-27
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin
IPC: H04W56/00
CPC classification number: H04W56/006 , H04L27/2663 , H04L27/2672 , H04L27/2675 , H04L27/2688 , H04L27/2692 , H04W56/0065
Abstract: Techniques are presented for a first device configured to be in communication with a second device in a digital communication system to receive an orthogonal frequency division multiplexed (OFDM) ranging signal from the second device. The OFDM ranging signal comprises a plurality OFDM symbols that encode a known bit sequence within a subset of available OFDM communication subcarriers and a subset of available time slots. The OFDM ranging signal is analyzed to determine a timing offset for the second device due to a time for signals to travel between the first device and second device over a communication channel. A message is transmitted from the first device to the second device, the message including information configured to indicate the timing offset.
Abstract translation: 针对被配置为与数字通信系统中的第二设备通信的第一设备呈现技术，以从第二设备接收正交频分复用（OFDM）测距信号。 OFDM测距信号包括对可用OFDM通信子载波的子集内的已知比特序列和可用时隙的子集进行编码的多个OFDM符号。 分析OFDM测距信号以确定由于通过通信信道在第一设备和第二设备之间传输信号的时间的第二设备的定时偏移。 消息从第一设备发送到第二设备，消息包括被配置为指示定时偏移的信息。
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公开(公告)号：US10985800B2
公开(公告)日：2021-04-20
申请号：US16792740
申请日：2020-02-17
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：US10965332B2
公开(公告)日：2021-03-30
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：US10771106B1
公开(公告)日：2020-09-08
申请号：US16362293
申请日：2019-03-22
Applicant: Cisco Technology, Inc.
Abstract: Proactive Echo Cancellation (EC) training may be provided. First, a plurality of Echo Cancelation Training Opportunities (ECTOs) may be identified in an upstream bandwidth allocation. Identifying the ECTOs may comprise identifying a corresponding plurality of mini-slots in a two dimensional time frequency space designated as not to be used for Upstream (US) traffic. Then Echo Cancelation Training (ECT) may be conducted for each of the plurality of ECTOs.
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公开(公告)号：US20200245346A1
公开(公告)日：2020-07-30
申请号：US16257485
申请日：2019-01-25
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Tong Liu , Hang Jin
Abstract: A centralized Upstream (US) scheduling system configured to provide a US split scheduler may be provided. The centralized US scheduling system may comprise a US scheduler and a map editor. The US scheduler may be configured to create a map for US bandwidth allocation. The map may include Steady-State Grants (SGNTs) and Editable Grants (EGNTs). The map editor may be configured to receive the map from the US scheduler and to assign the EGNTs among low latency Service Flows (SFs).
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Patent Agency Ranking
公开(公告)号：US20190386701A1
公开(公告)日：2019-12-19
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：US20190386700A1
公开(公告)日：2019-12-19
申请号：US16008737
申请日：2018-06-14
Applicant: Cisco Technology, Inc.
Inventor： John T. Chapman , Hang Jin , John Holobinko , Yubin Chen , John Alexander Ritchie, JR. , Martin Mattingly
Abstract: 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.
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公开(公告)号：US10476448B1
公开(公告)日：2019-11-12
申请号：US15956858
申请日：2018-04-19
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: 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.
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公开(公告)号：US20190305815A1
公开(公告)日：2019-10-03
申请号：US15943982
申请日：2018-04-03
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , John T. Chapman
Abstract: 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.
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60.发明授权公开(公告)号：US10361837B2
公开(公告)日：2019-07-23
申请号：US15625940
申请日：2017-06-16
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin
Abstract: A method in an embodiment includes calculating a first packet error rate (PER) of a flow sent from a source to a cable modem over a first period of time in a full duplex cable network, tagging the flow based on determining the first PER satisfies a tag threshold associated with the flow, and intercepting, at a selective proxy, a packet of the tagged flow. The method further includes storing a backup of the packet, transmitting the packet to the cable modem, determining the cable modem did not receive the packet, and retransmitting the backup of the packet to the cable modem. Further embodiments include dynamically calculating a second PER of the tagged flow based on a second period of time, determining the second PER satisfies a de-tag threshold, and revoking the tagging of the flow based, at least in part, on determining the second PER satisfies the de-tag threshold.
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