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公开(公告)号：US20170019241A1
公开(公告)日：2017-01-19
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.
Abstract translation: 示例性通信系统包括有线网络中的媒体接入控制（MAC）调度器和全频带收发机。 MAC调度器在有线网络中的多个有线调制解调器之间实现二维发送接收（T-R）协调方案。 根据TR协调方案，电缆调制解调器被分为干扰组，使得任何一个干扰组的电缆调制解调器在同一干扰组中的另一个电缆调制解调器在频率范围内接收下游的同时在频率范围内上行传输，有利于 全双工通信在有线网络中跨越频率范围。 全频带收发器实现自适应干扰消除方案，其在相应分量的接收机处抑制由相应分量的发射机发送的信号。 通信系统还包括全频带放大器，实现自适应干扰消除方案和具有回波消除的振铃抑制方案。
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公开(公告)号：US09237040B1
公开(公告)日：2016-01-12
申请号：US14642979
申请日：2015-03-10
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin
CPC classification number: H04L25/03012 , H04L25/03343 , H04L25/03878 , H04L2025/03808
Abstract: Presented herein are techniques for enhancing pre-equalization operations in a telecommunications network. In one example, a cable modem termination system (CMTS) determines the coherent bandwidth for pre-equalization coefficients associated with upstream transmissions received from a cable modem. The CMTS uses the coherent bandwidth of the pre-equalization coefficients to calculate a time constant for a time domain filter that may be applied to the pre-equalization coefficients. The CMTS also calculates, based on the time constant, filter coefficients for the time domain filter and applies the time domain filter to the pre-equalization coefficients to generate signal-to-noise ratio (SNR)-enhanced pre-equalization coefficients. The CMTS then sends the SNR-enhanced pre-equalization coefficients to the cable modem.
Abstract translation: 这里提出的是用于增强电信网络中的预均衡操作的技术。 在一个示例中，有线调制解调器终端系统（CMTS）确定与从电缆调制解调器接收的上行传输相关联的预均衡系数的相干带宽。 CMTS使用预均衡系数的相干带宽来计算可应用于预均衡系数的时域滤波器的时间常数。 CMTS还基于时间常数计算时域滤波器的滤波器系数，并将时域滤波器应用于预均衡系数，以生成信噪比（SNR）增强的预均衡系数。 然后，CMTS将SNR增强的预均衡系数发送到电缆调制解调器。
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公开(公告)号：US20150110205A1
公开(公告)日：2015-04-23
申请号：US14317400
申请日：2014-06-27
Applicant: Cisco Technology, Inc.
Inventor： Hang Jin , Koen Van Renterghem , Richard Meller , Denis Downey , Glendon L. Akins, III
CPC classification number: H04L1/0054 , H04L1/0047 , H04L1/0057 , H04L12/2801 , H04L25/067 , H04L27/0002 , H04L27/2647 , H04N7/173 , H04N7/22
Abstract: Presented herein are non-disruptive noise estimation techniques that utilize a correlation between attributes of a received signal and the noise to generate estimated noise values for symbols of the signal. More specifically, a digital signal comprising symbols transmitted over a telecommunications network is received. For each of a plurality of the symbols, an estimated noise value associated with the respective symbol is generated through a correlation of a log-likelihood ratio (LLR) value to predetermined noise values. The estimated noise values for the plurality of symbols are used to generate noise information representing time and frequency characteristics of noise in the telecommunications network.
Abstract translation: 这里提出的是利用接收信号的属性与噪声之间的相关性来产生信号符号的估计噪声值的非破坏性噪声估计技术。 更具体地，接收包括通过电信网络发送的符号的数字信号。 对于多个符号中的每一个，通过对数似然比（LLR）值与预定噪声值的相关性来生成与相应符号相关联的估计噪声值。 用于多个符号的估计噪声值用于产生表示电信网络中噪声的时间和频率特性的噪声信息。
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34.发明授权公开(公告)号：US10797750B2
公开(公告)日：2020-10-06
申请号：US15352445
申请日：2016-11-15
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Hang Jin , John T. Chapman
Abstract: An example apparatus for supporting digital pre-distortion (DPD) and full duplex (FDX) in cable network environments is provided and includes a first path for signals being transmitted out of the apparatus, a second path for signals being received into the apparatus, a DPD actuator located on the first path, an amplifier located on the first path, an echo cancellation (EC) actuator located on the second path, and a data interface including a plurality of channels connecting the apparatus to a signal processor. DPD coefficients, EC coefficients and delay parameters are provided over the data interface from the signal processor to the apparatus. The DPD actuator predistorts signals on the first path using the DPD coefficients compensating for distortions introduced by the amplifier, and the EC actuator reduces interferences in signals on the second path using the EC coefficients and the delay parameters, facilitating FDX communication by the apparatus.
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公开(公告)号：US10720961B2
公开(公告)日：2020-07-21
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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Patent Agency Ranking
公开(公告)号：US10536667B2
公开(公告)日：2020-01-14
申请号：US15626100
申请日：2017-06-17
Applicant: CISCO TECHNOLOGY, INC.
Inventor： Alon Shlomo Bernstein , Hang Jin
IPC: H04N21/45 , H04N21/442 , H04N7/10
Abstract: 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.
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公开(公告)号：US10530310B2
公开(公告)日：2020-01-07
申请号：US15957061
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 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.
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公开(公告)号：US20190379423A1
公开(公告)日：2019-12-12
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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公开(公告)号：US20190238229A1
公开(公告)日：2019-08-01
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
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：US10367631B2
公开(公告)日：2019-07-30
申请号：US15648309
申请日：2017-07-12
Applicant: CISCO TECHNOLOGY, INC.
Inventor： John T. Chapman , Hang Jin
Abstract: Designs for a front end for suppressing adjacent channel interference (ACI) and adjacent leakage interference (ALI) in a full duplex cable modem (CM) for a Data Over Cable Service Interface Specification (“DOCSIS”) network are described. The CM includes an upstream (US) signal path receiving a digital US input signal and transmitting an analog-converted US signal in a US frequency range to a cable modem termination system (CMTS); a downstream (DS) signal path receiving an analog DS signal in a DS frequency range and converting the analog DS signal into a digital DS signal; and an echo cancellation (EC) circuit configured to subtract, from at least one of the analog DS signal and the digital DS signal, a correction signal generated from the digital US input signal or a correction signal generated from the analog-converted US signal to generate an echo-cancelled digital DS input signal without ACI and ALI.
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