公开(公告)号：US09191150B2

公开(公告)日：2015-11-17

申请号：US14259108

申请日：2014-04-22

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas H. Williams ,  Belal Hamzeh

IPC: H04L1/00

CPC classification number: H04L1/0027 ,  H04L1/003 ,  H04L1/0041 ,  H04L1/0042 ,  H04L1/0057 ,  H04L5/0044 ,  H04L5/0082

Abstract: Skipping, spreading or otherwise metering signaling across multiple transmission opportunities is contemplated. The contemplated signal processing may be beneficial in ameliorating the influence of burst noise and other interferences on signal transmissions. The contemplated signal processing may be operable to facilitate supplementing and/or replacing other error correction techniques aimed at reducing signaling interference.

Abstract translation: 考虑跨多个传输机会跳过，传播或以其他方式计量信令。 预期的信号处理可以有利于改善突发噪声和其他干扰对信号传输的影响。 预期的信号处理可以可操作以便于补充和/或替换旨在减少信令干扰的其他纠错技术。

公开(公告)号：US20150229416A1

公开(公告)日：2015-08-13

申请号：US14621842

申请日：2015-02-13

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas H. Williams

IPC: H04B17/18 ,  H04W24/08

CPC classification number: H04W24/08 ,  H04B3/46 ,  H04N21/42676 ,  H04N21/6118

Abstract: Systems and methods presented herein provide for monitoring of noise and other interfering energy on a communication link. One system includes an interface coupled to the communication link to receive a signal conveyed over the communication link. The system also includes a monitor operable to: track energy across a frequency spectrum of the signal conveyed over the communication link for a predetermined period of time; flag, at intervals of the predetermined period of time, energy levels across the frequency spectrum of the signal that breach a threshold energy level to identify where in the frequency spectrum a breach of the threshold energy level occurs; and add the flags to determine how long the threshold energy level was breached during the predetermined period of time.

Abstract translation: 本文提出的系统和方法提供了对通信链路上的噪声和其他干扰能量的监测。 一个系统包括耦合到通信链路以接收通过通信链路传送的信号的接口。 该系统还包括监视器，其可操作以：在通过通信链路传送的信号的频谱上跟踪预定时间段的能量; 在所述预定时间间隔的间隔内，跨越所述信号的所述频谱的能量水平，所述能量水平违反阈值能级以识别在所述频谱中哪里出现阈值能级的违反; 并添加标志以确定在预定时间段内阈值能级被破坏的时间。

公开(公告)号：US20150043626A1

公开(公告)日：2015-02-12

申请号：US13963957

申请日：2013-08-09

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas H. Williams ,  Luis Alberto Campos

IPC: H04B3/46 ,  H04L12/26 ,  H04B10/079 ,  H04W24/08

CPC classification number: H04B3/46 ,  H04B10/07953 ,  H04B10/6163 ,  H04L43/08 ,  H04W24/08

Abstract: A method to capture random data signals at an end point in a broadband network and process them via digital signal processing (DSP) techniques to determine both linear distortions and nonlinear distortions. In a distribution network, such as a tree and branch cable network, the location of the impairment addition can be identified by determining location of terminals have a distortion and locations of terminals that do not have a distortion. Linear distortions may be determined by an autocorrelation of the captured signal with itself. Nonlinear distortions may be determined by processing measured energy in a vacant band with manufactured energy in the vacant band. If a vacant band is not available, one can be created by demodulating a signal occupying the band, and subtracting the demodulated signal from the measured signal plus interference in a band, leaving only the interference.

公开(公告)号：US20150003828A1

公开(公告)日：2015-01-01

申请号：US13931528

申请日：2013-06-28

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas H. Williams ,  Luis Alberto Campos ,  Christopher Donley

IPC: H04L12/761 ,  H04B10/2575 ,  H04L12/741

CPC classification number: H04B10/2575 ,  H04B10/25751

Abstract: A digital (fiber optic) link transports one or more RF digital signal blocks, that when converted into analog and (optionally) converted to a RF center frequency with an D-A converter, form RF analog signal blocks. The RF analog signal block occupies a specified frequency band and is preferably capable of being distributed over a downstream coaxial portion of a HFC network and/or being broadcast. The D-A conversion is performed in a fiber node at a remote location where the transmission medium converts from digital optical fiber preferably to coaxial cable. The multiple RF digital signal blocks may be broadcast to multiple nodes or unicast to a single node. The RF signal blocks allow for any type of band-limited RF signal to be transported. The optical digital traffic to compose a RF analog signal blocks using a D-A converter may be point-to-point Ethernet, or may utilize a software-defined networking controller such as the one described in the OpenFlow™ specification, and may use buffering as necessary.

Abstract translation: 数字（光纤）链路传输一个或多个RF数字信号块，当将其转换成模拟和（可选地）用D-A转换器转换成RF中心频率时，形成RF模拟信号块。 RF模拟信号块占用指定的频带，并且优选地能够分布在HFC网络的下游同轴部分和/或被广播。 在传输介质从数字光纤优选地转换到同轴电缆的远程位置的光纤节点中进行D-A转换。 多个RF数字信号块可以广播到多个节点或单播到单个节点。 RF信号块允许传送任何类型的带限RF信号。 使用DA转换器构成RF模拟信号块的光学数字业务可以是点对点以太网，或者可以利用诸如OpenFlow TM规范中所述的软件定义的网络控制器，并且可以根据需要使用缓冲 。

公开(公告)号：US20140003547A1

公开(公告)日：2014-01-02

申请号：US13841313

申请日：2013-03-15

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas H. Williams ,  Luis Alberto Campos

IPC: H04L27/26

CPC classification number: H04L27/265 ,  H04L27/2647

Abstract: A modulation transmission technique comprises placing orthogonal subcarriers across an arbitrary-wide band of frequencies without a fixed pre-defined center frequency. Receivers demodulate only the sub-group of subcarriers in which they are to receive data. Thus a broadcast service with many audio programs could send signals across a wide band and receivers would only demodulate the audio channel that the user or users wanted to hear. This saves energy which is important for battery powered devices. A transform bandwidth smaller than the transform bandwidth of the transmitter is used that encompasses the receivers pass band, plus the 2 transition bands (upper and lower) of the linear filter. This technique maintains orthogonality between subcarriers. The subcarriers in the pass band are utilized and the subcarriers in the transition bands are discarded. The orthogonal subcarriers may include both orthogonal frequency division multiplexed and pulse amplitude modulated signals. A notch filter may be included in the receiver to remove unwanted non-orthogonal signals such as a television signal or other interference.

Abstract translation: 调制传输技术包括在没有固定预定义中心频率的任意宽频带上放置正交子载波。 接收机仅解调它们将要接收数据的子载波的子组。 因此，具有许多音频节目的广播服务可以在宽频带上发送信号，并且接收机将仅解调用户或用户想要听到的音频频道。 这节省了对电池供电设备很重要的能源。 使用小于发射机的变换带宽的变换带宽，其包含接收机通带，加上线性滤波器的2个过渡频带（上下）。 该技术保持子载波之间的正交性。 利用通带中的子载波，并且丢弃过渡频带中的子载波。 正交子载波可以包括正交频分复用和脉冲幅度调制信号。 接收器中可以包括陷波滤波器以去除诸如电视信号或其他干扰的不期望的非正交信号。

公开(公告)号：US11968001B2

公开(公告)日：2024-04-23

申请号：US18114889

申请日：2023-02-27

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Thomas H. Williams ,  Gregory Charles White

IPC: H04L5/12 ,  H04B3/04 ,  H04L27/00 ,  H04L27/04 ,  H04L27/20 ,  H04L27/34

CPC classification number: H04B3/04 ,  H04L27/0008 ,  H04L27/04 ,  H04L27/20 ,  H04L27/3411

Abstract: A method of reducing transmission power for an encoded data stream includes the steps of receiving an incoming data stream having equal probability for a plurality of incoming data bits, assigning a symbol scheme to the received data bits of the incoming data stream according to probabilities of occurrence of individual ones of the received data bits, and transmitting an outgoing data stream according to the assigned symbol scheme having a second average transmit power, different than the first average transmit power, for a plurality of outgoing symbols.

公开(公告)号：US11575406B1

公开(公告)日：2023-02-07

申请号：US17516363

申请日：2021-11-01

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Thomas H. Williams

IPC: H04B1/71 ,  H04B1/7107 ,  H04B1/10 ,  H04B1/12 ,  H04B10/112

Abstract: An interference canceling subsystem for a bidirectional communications network includes an input interface configured to receive a first data signal from a first transceiver of the network, an output portion configured to receive a second data signal from a second transceiver of the network, a first signal path connecting the input interface to the output portion, a second signal path connecting the output portion to the input interface, and a first interference canceler disposed between the output portion and the input interface along the second signal path. The first signal path is configured to relay the first data signal from the input interface to the output portion. The interference canceler is configured to (i) relay the second data signal from the output portion to the input interface, and (ii) remove portions of the first data signal from the relayed second data signal prior to reaching the input interface.

公开(公告)号：US20210409068A1

公开(公告)日：2021-12-30

申请号：US17468197

申请日：2021-09-07

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Thomas H. Williams ,  Gregory Charles White

IPC: H04B3/04 ,  H04L27/00 ,  H04L27/04 ,  H04L27/20 ,  H04L27/34

Abstract: A method of reducing transmission power for an encoded data stream includes the steps of receiving an incoming data stream having equal probability for a plurality of incoming data bits, assigning a symbol scheme to the received data bits of the incoming data stream according to probabilities of occurrence of individual ones of the received data bits, and transmitting an outgoing data stream according to the assigned symbol scheme having a second average transmit power, different than the first average transmit power, for a plurality of outgoing symbols.

公开(公告)号：US11165463B1

公开(公告)日：2021-11-02

申请号：US16927802

申请日：2020-07-13

Applicant: CABLE TELEVISION LABORATORIES, INC

Inventor： Thomas H. Williams

IPC: H04B1/71 ,  H04B1/7107 ,  H04B1/10 ,  H04B10/112 ,  H04B1/12

Abstract: An interference canceling subsystem for a bidirectional communications network includes an input interface configured to receive a first data signal from a first transceiver of the network, an output portion configured to receive a second data signal from a second transceiver of the network, a first signal path connecting the input interface to the output portion, a second signal path connecting the output portion to the input interface, and a first interference canceler disposed between the output portion and the input interface along the second signal path. The first signal path is configured to relay the first data signal from the input interface to the output portion. The interference canceler is configured to (i) relay the second data signal from the output portion to the input interface, and (ii) remove portions of the first data signal from the relayed second data signal prior to reaching the input interface.

公开(公告)号：US20210266096A1

公开(公告)日：2021-08-26

申请号：US17315854

申请日：2021-05-10

Applicant: CABLE TELEVISION LABORATORIES, INC.

Inventor： Thomas H. Williams ,  Gregory Charles White

IPC: H04L1/00 ,  H04L27/26 ,  H04L25/03

Abstract: A receiver is configured to capture a plurality of linearly distorted OFDM symbols transmitted over a signal path. The receiver forms the captured OFDM symbols into an overlapped compound data block that includes payload data and at least one pseudo-extension, processes the overlapped compound block with circular convolution in the time domain using an inverse channel response, or frequency domain equalization, to produce an equalized compound block, and discards end portions of the equalized block to produce a narrow equalized block. The end portion corresponds with the pseudo-extension, and the narrow block corresponds with the payload data. The receiver cascades multiple narrow equalized blocks to form a de-ghosted signal stream of OFDM symbols. The OFDM symbols may be OFDM or OFDMA, and may or may not include a cyclic prefix, which will have a different length from the pseudo-extension.