Future Wei Technologies, Inc.

Centillium Communications, Inc.

Huawei Technologies Co., Limited

Ikanos Communications, Inc.

Intel Corporation

Centilliune Communications, Inc.

Guozhu Long

Raphael Jean Cendrillon

Guijin Xu

Amir H Fazlollahi

Dong Wei

Jianhua Liu

Ruzhou Feng

Yuchen Jia

Syed Abbas

Chin Ngek Hung

Frank J Effenberger

Xiang Liu

Ying Li

Liming Fang

Ruijie Xiao

Zhilei Zhao

Yaron Bar-Ness

Cheng Li

Huaiyu Zeng

Yan Wei Zhang

Xuyong Wu

Sanjay Gupta

Huishen Dong

XiangGuo Tang

Anni Wu

Ruxiang Wang

Xiang Wang

Liang Chen

Steven R Blackwell

Jalil Kamali

Cao Shi

Haixiang Liang

Jie Lv

Jim Beaney

Yixian Liu

Xiaoyue He

Pengrui Zhang

Qingyi Zheng

Farrokh Rashid-Farrokhi

Yan Zhang

Mark Hashemi

Les Brown

Anthony J P O'Toole

Wei Dong

Jean Cendrillon Raphael

Gupta Sanjay

H Fazlollahi Amir

An ONU comprises a receiver configured to receive a continuous-mode TDMA downstream signal from an OLT; a PD coupled to the receiver and configured to convert the continuous-mode TDMA downstream signal to an electrical signal or an RF signal; an ADC coupled to the PD and configured to convert the electrical signal or the RF signal to a digital signal; and a burst-mode data recovery stage coupled to the ADC and configured to perform data recovery on a segment of the digital signal corresponding to the ONU, the burst-mode data recovery stage comprises a synchronization stage configured to perform synchronization on the segment.

Reduced power consumption for digital signal processing (DSP)-based reception in time-division multiplexing (TDM) passive optical networks (PONs)

The present invention provides a method, an apparatus, and a system for time synchronization of an xDSL. The method includes: transmitting, by a customer premises equipment, a first symbol to a central office equipment, and obtaining time Tsindicating the moment that the first symbol is transmitted; receiving, by the CPE, a second symbol transmitted by the CO, and obtaining time Tsindicating the moment that the second symbol is received; obtaining, by the CPE obtains time Tmindicating the moment that the first symbol is received by the CO and time Tmindicating the moment that the second symbol is transmitted by the CO; the CPE calculates an offset between a clock of the CPE and a clock of the CO according to Ts, Ts, Tmand Tm; and the CPE adjusts the clock of the CPE according to the offset to achieve synchronization.

Method, apparatus, and system for time synchronization of XDSL

An apparatus comprising a receiver coupled to a digital subscriber line (DSL) between an exchange site and a customer premise equipment (CPE) and configured to send a feedback error message to train a precoder coupled to the exchange site, wherein the feedback error message comprises a plurality of error components and an indication of a quantity of bits per error component, a quantization accuracy per error component, or both. Included is a method comprising sending an error feedback message to a DSL crosstalk precoder to train the crosstalk precoder, wherein the error feedback message comprises an error vector and a quantization scaling factor of the error vector.

Reducing the feedback overhead during crosstalk precoder initialization

Embodiments of the present invention provide a signal processing method in a DSL system. The method includes: determining that there is no to-be-sent downstream signal on m subscriber lines in n subscriber lines; superimposing a signal X on the m subscriber lines, so that a signal output on the m subscriber lines after precoding processing is 0, where xindicates a signal component loaded on the msubscriber line in the m subscriber lines; performing precoding processing on a downstream signal on the n subscriber lines; and sending the downstream signal that has undergone the precoding processing on another line except the m subscriber lines in the n subscriber lines. The embodiments of the present invention further provide a network-side device and a DSL system.

Signal processing method in DSL system, apparatus, and system

An apparatus comprises: a receiver port configured to receive an input signal comprising in-phase and quadrature (IQ) data and control words (CWs); a peak-to-average power (PAPR) reducer coupled to the receiver port and configured to: receive the IQ data, process the IQ data, separate the IQ data into a clipped signal and a peak signal, and determine peak information associated with the peak signal; and a transmitter port coupled to the PAPR reducer and configured to separately transmit the clipped signal and the peak information. A method comprises: receiving an input signal comprising first data and second data; processing the first data; separating the first data into a clipped signal and a peak signal; determining peak information associated with the peak signal; and transmitting the clipped signal and the peak information.

Peak-to-average power ratio (PAPR) reduction in fronthauls

Embodiments of the present invention disclose a signal transmission method. A first correspondence is acquired between both a PSD of transmitted signals of the first communications equipment and a PSD of transmitted signals of a second communications equipment and a signal-to-noise ratio of received signals of the first communications equipment. A second correspondence is acquired between the signal-to-noise ratio of received signals of the first communications equipment and the number of bits for bearing signals. An optimization algorithm is used to calculate a PSD of transmitted signals of the first communications equipment and a PSD of transmitted signals of the second communications equipment.

Signal transmission method, communications equipment, and system

A method of discontinuous transmission data communication in a digital subscriber line (DSL) transceiver unit, the method comprising determining that a number of a plurality of bits available to transmit is enough to fill a data transfer unit (DTU), forming a DTU, by a DTU framer, comprising the plurality of bits, transferring the DTU to a retransmission queue, and determining the DTUs from the retransmission queue to be transmitted over a next time period used for transmitting over the DSL subscriber line by the DSL transceiver unit.

Pre-fill retransmission queue

An apparatus comprising a customer node configured to couple to an access node and to receive via a channel from the access node a time of day (TOD) value and a corresponding sample index (SNUM) value, wherein the TOD value and the SNUM value are used to estimate a second time of day (TOD') value based on a propagation delay of the channel (L-Delay), and wherein the TOD value and the TOD&#x2032; value are used to estimate a second SNUM value (SNUM&#x2032;) based on L-Delay and a plurality of parameters.

Method for accurate distribution of time to a receiver node in an access network

An apparatus comprising a first line driver, a second line driver, a charge pump, and a control logic circuit coupled to the first line driver and the second line driver and configured to disable the charge pump when both a first control signal associated with the first line driver and a second control signal associated with the second line driver indicate a charge pump disable state. A network component comprising at least one processor configured to implement a method comprising receiving a first control signal and a second control signal, disabling a charge pump when both the first control signal and the second control signal indicate a charge pump disable state, and operating the charge pump to boost a voltage when the first control signal, the second control signal, or both indicate a charge pump active state.

Power efficiency of a line driver

A method, apparatus, and system for time synchronization are disclosed. The method comprising: obtaining a master sending time stamp, a slave receiving time stamp, a slave sending time stamp, and a master receiving time stamp; and adjusting the time of the slave clock according to the offset calculated from the time stamps to synchronize with the clock time of the master clock. With the present invention, in passband transmission systems that transmit signals continuously in units of symbols, the time synchronization is implemented between the master clock and the slave clock.

Method, apparatus, and system for time synchronization

A method implemented in a multicarrier transmission system, the method comprising generating a plurality of constellation points by using one or more constellation mappers to map a plurality of special data sequences for an idle data transmission unit (IDTU), wherein the plurality of special data sequences are computed prior to the mapping such that the plurality of constellation points are essentially inner constellation points, wherein each of the inner constellation points resides in a constellation diagram that corresponds to one of a plurality of subcarriers used by the IDTU, and wherein the constellation diagram comprises a number of inner constellation points and a number of outer constellation points, with the inner constellation points being closer from an origin of the constellation diagram than the outer constellation points, and transmitting the plurality of constellation points.

Power saving idle data transmission units

A clock synchronization method, customer premises equipment and a clock synchronization system are provided. The customer premises equipment reads a first time stamp when receiving a first specific position of a first DMT signal sent by central office equipment; reads a second time stamp when sending a second specific position of a second DMT signal; receives a third time stamp and a fourth time stamp that are sent by the central office equipment through a data information channel. The third time stamp is read when the central office equipment sends the first specific position of the first DMT signal, and the fourth time stamp is read when the central office equipment receives the second specific position of the second DMT signal. The customer premises equipment adjusts a clock of the customer premises equipment according to the first, second, third and fourth time stamps.

Clock synchronization method, customer premises equipment and clock synchronization system

An apparatus comprising a transmitter at a digital subscriber line (DSL) Cabinet configured to transmit a downstream signal in a subscriber line according to a power spectral density (PSD) configuration, wherein the PSD configuration comprises a cutoff frequency based on a required data-rate of the subscriber line. Also included is an apparatus comprising at least one processor configured to implement a method comprising determining a downstream PSD for a PSD mask for a DSL, determining a cutoff frequency for the PSD profile based on a data-rate required for the DSL, and adjusting a downstream signal power on the DSL according to the PSD mask. Included is a method comprising configuring a plurality of transmitted PSDs for a plurality of Exchange deployed lines and Cabinet deployed lines by varying a plurality of cutoff frequencies corresponding to the transmitted PSDs, wherein the cutoff frequencies are varied by line, with time, or both.

Optimizing the transmit power spectrum density (PSD) of a remotely deployed line to ensure spectral compatibility

An apparatus comprising a first transceiver at a central office (CO) coupled to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL), a crosstalk precoder coupled to the first transceiver at the CO, and a vectoring control entity (VCE) coupled to the transceiver via a feedback channel and to the crosstalk precoder, wherein the second transceiver comprises a noise monitor configured to detect non-crosstalk noise in a downstream signal from the CO to the CPE, and wherein the first transceiver is configured to receive a predefined special feedback signal from the second transceiver that indicates whether non-crosstalk noise is detected in the downstream signal instead of a measured error value.

Method for robust crosstalk precoder training in channels with impulse noise

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Fremont, CA, United States of America

Guozhu Long