Patent application number | Description | Published |
20090323787 | Method, Device, and System for Channel Estimation - A method for channel estimation includes: loading a combination of signals sent on other lines over a line of a channel; measuring a signal-to-noise ratio (SNR) of the loaded line; and calculating crosstalk channels of the loaded line according to a coefficient of the combination of signals sent on other lines and the measured SNR. Accordingly, a device and system for channel estimation are provided. The technical solution of the present invention may be used for relevant systems such as an x Digital Subscriber Line (xDSL) system. | 12-31-2009 |
20100303213 | Method, Equipment and Digital Subscriber Line System for Spectrum Optimization - The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation. The embodiments of the present invention can overcome the problem of the conventional art that it is difficult to converge the rate weighted coefficient, and improve the rate of a given subscriber line while reduce power loss caused by the given subscriber line to other subscriber lines in the same bundle of cables. | 12-02-2010 |
20110170578 | PROCESSING METHOD AND TRANSCEIVER FOR CHANNEL CHANGING IN JOINT TRANSCEIVING MODE - A processing method and a transceiver for channel changing in a joint transceiving mode are provided. The method includes: performing fault detection for one or more direct channels; after a fault is detected on a direct channel, stopping sending signals on the direct channel; detecting whether the direct channel with fault has been recovered; and when recovery of the direct channel with fault is detected, resuming sending signals on the direct channel. | 07-14-2011 |
Patent application number | Description | Published |
20100195704 | Low Complexity Technique for Digital Subscriber Line (DSL) Power Control - 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) mask, wherein the PSD mask comprises a relatively low power between a first transition frequency and a second transition frequency and a first relatively high power below about the first transition frequency and a second relatively high power above about the second transition frequency. Also included is an apparatus comprising at least one processor configured to implement a method comprising selecting a first transmission frequency and a second transmission frequency for a PSD that meets a target data-rate for transmission in a DSL, and limiting the PSD between the first transition frequency and the second transition frequency. | 08-05-2010 |
20100195745 | Dynamic Transmitter Noise Level Adjustment for Digital Subscriber Line Systems - An apparatus comprising an artificial noise (AN) controller coupled to a digital subscriber line (DSL) transmitter and configured to adjust an AN level for a signal transmitted by the DSL transmitter, wherein the AN level is adjusted based on an actual signal to noise ratio (SNR) of the signal from the receiver to achieve a desired SNR for the signal. Also disclosed is a method comprising maintaining a data rate in a line at about a desired level by adjusting an AN level in a transmitted signal based on a SNR of a received signal. | 08-05-2010 |
20100195817 | Reducing the Feedback Overhead During Crosstalk Precoder Initialization - 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. | 08-05-2010 |
20100246606 | Optimizing the Transmit Power Spectrum Density (PSD) Of A Remotely Deployed Line to Ensure Spectral Compatibility - 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. | 09-30-2010 |
20100254442 | Configuring the Virtual Noise Parameters of a Digital Subscriber Line - An apparatus comprising a digital subscriber line (DSL) transmitter configured to transmit a transmitter referred virtual noise for a tone in a subscriber line, wherein the transmitter referred virtual noise is based on a time history of a noise condition in the subscriber line. Also disclosed is an apparatus comprising at least one processor configured to implement a method comprising obtaining a transmitter referred virtual noise for a DSL tone using a plurality of noise condition measurements, and determining a DSL bitloading using the transmitter referred virtual noise. | 10-07-2010 |
20110007623 | Method for Estimating the Strength of a Crosstalk Channel - A network component comprising at least one processor coupled to a memory and configured to receive a plurality of probing signals from the other end of a plurality of corresponding lines, correlate the received probing signals or their error signals with the orthogonal frequency signatures to determine the dominant crosstalk channels for each of the lines, and send a plurality of signals that correspond to the dominant crosstalk channels to a crosstalk canceller to reduce crosstalk noise in the lines, wherein each of the orthogonal frequency signatures is transmitted in a sync symbol on one of the lines, and wherein the sync symbol comprises a plurality of tones. | 01-13-2011 |
20110007788 | Method for Robust Crosstalk Precoder Training in Channels with Impulse Noise - 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. | 01-13-2011 |
20130215940 | Method for Robust Crosstalk Precoder Training in Channels with Impulse Noise - 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. | 08-22-2013 |
20140233722 | Reducing the Feedback Overhead During Crosstalk Precoder Initialization - 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. | 08-21-2014 |