Class / Patent application number | Description | Number of patent applications / Date published |
379414000 | TRANSMISSION LINE CONDITIONING | 16 |
20140233725 | PERSONALIZED BANDWIDTH EXTENSION - A personalized (i.e., speaker-derivable) bandwidth extension is provided in which the model used for bandwidth extension is personalized (e.g., tailored) to each specific user. A training phase is performed to generate a bandwidth extension model that is personalized to a user. The model may be subsequently used in a bandwidth extension phase during a phone call involving the user. The bandwidth extension phase, using the personalized bandwidth extension model, will be activated when a higher band (e.g., wideband) is not available and the call is taking place on a lower band (e.g., narrowband). | 08-21-2014 |
379416000 | Interference suppression | 15 |
20080247537 | Reducing interference in DSL service from broadband over powerline signals - The specification describes a new technique for reducing interference in EDSL signals caused by local BPL transmission lines. It involves sampling the power line signal to derive a noise signal representing the BPL noise causing the EDSL interference, and mixing the BPL noise signal with the EDSL signal to cancel the BPL noise in the EDSL signal. The technique may be implemented by plugging into a conventional home electrical receptacle, and inserting a small noise canceling module in the EDSL line. | 10-09-2008 |
20090122977 | SYSTEMS AND METHODS FOR A MULTICARRIER TRANSCEIVER WITH RADIO FREQUENCY INTERFERENCE REDUCTION - A multi-carrier information transceiver that exhibits robustness against radio frequency interference (RFI) signals present in the communications channel. The transceiver includes a RFI mitigation technique that operates not only during the steady state operation of the transceiver but also during the training stage of the transceiver. That requires dynamically modifying the training signals when the presence of RFI is detected. The modification of the training signals facilitates the estimation of RFI, improving the performance of the multi-carrier transceiver. | 05-14-2009 |
20090296921 | Method And Device For Transmitting Data Packets - In order in particular to allow a synchronization on data packets, the method comprises:
| 12-03-2009 |
20120263295 | ACTIVE MICROFILTER FOR VDSL2 COMMUNICATION STANDARD - The active microfilter is essentially composed of an active part, which comprises a sign inverter circuit composed of an operational amplifier ( | 10-18-2012 |
379417000 | Anticrosstalk | 11 |
20080212768 | METHOD AND APPARATUS FOR ADAPTIVE POWER ADJUSTMENT BASED ON REDUCTION OF CROSS-TALK BETWEEN DSLs - An adaptive power adjustment method and means based on reducing crosstalk among DSL lines includes: calculating the crosstalk power spectrum density and the crosstalk function from the neighboring line in current line; calculating the transmission power spectrum density of the current terminal device according to the obtained crosstalk power spectrum density and crosstalk function; and the current terminal device controlling the transmission power based on the transmission power spectrum density. According to the adaptive power adjustment method of the present invention, the transmission power can be increased or decreased. The disadvantageous effect due to the crosstalk among xDSL lines is reduced. Present invention can eliminate or reduce adequately the strong impact on remote terminal application scene, and make the lines achieve the optimum operation state. | 09-04-2008 |
20080267392 | Crosstalk Recognition in Presence of Radio Frequency Interference - Crosstalk interference induced by the adjacent pairs is one of the major performance limiting factors of DSL systems. As there is a rapid increase in the deployment of DSL services worldwide, the need to provide information about noise related parameters to the operators and the service providers is of utmost importance. Satisfying such a need enables operators to anticipate the line capacity and understand the noise level characteristics of the loop environment. Specifically, crosstalk and more particularly upstream near end crosstalk (NEXT) in the presence of narrowband interference can be classified to isolate the particular service type causing the upstream NEXT. The identification of the service type of the upstream NEXT would enable operators to address the disturber. | 10-30-2008 |
20090116639 | Method and apparatus for crosstalk mitigation - A method and apparatus for noise cancellation in a multi-channel communication system is disclosed. In one embodiment this system is configured to cancel FEXT on a victim channel utilizing the signals received on the other channels. The processing benefits gained by a receiver's other filters, such as for example, the FFE and DFE filters, is utilized when generating a FEXT cancellation signal. As a result, the complexity of the apparatus that generates the FEXT cancellation signal may be made less complex since part of the processing burden is performed by other filter apparatus. In one configuration pre-code FEXT cancellation occurs in that a pre-code FEXT filter generates one or more pre-code FEXT cancellation signals corresponding to each of the other channels. The pre-code FEXT cancellation signals are combined, prior to transmission, with the signals associated with each of the other channels, to thereby pre-cancel FEXT prior to transmission. | 05-07-2009 |
20090257581 | Cooperative MIMO for Alien Noise Cancellation (COMAC) for Upstream VDSL Systems - Included are embodiments for reducing alien crosstalk. At least one embodiment of a method includes receiving noise data associated with a first user signal on a first tone, receiving noise data associated with a second user signal on the first tone, and receiving at least one alien crosstalk canceller coefficient for the first user on the first tone. Some embodiments include applying the at least one alien crosstalk canceller coefficient to the second user signal to reduce alien crosstalk for the first user signal. | 10-15-2009 |
20100183141 | REDUCING FAR-END CROSSTALK IN CHIP-TO-CHIP COMMUNICATION SYSTEMS AND COMPONENTS - The present invention involves chip-to-chip communication systems for reducing Far-End Crosstalk (FEXT) through the use of novel polarity swapping to negate the cumulative effect of FEXT. Skew adjustment is used to improve the FEXT cancellation from polarity swapping. The polarity reversal location or locations among FEXT sources are optimized to achieve maximum FEXT cancellation. The novelty polarity swapping technique can be applied to a wide variety of systems that can benefit from FEXT reduction. | 07-22-2010 |
20100246805 | CROSSTALK IDENTIFICATION FOR SPECTRUM MANAGEMENT IN BROADBAND TELECOMMUNICATIONS SYSTEMS - Crosstalk between subscriber loops used to transmit different broadband services through the same bundled telephone cable is a significant limitation to providing digital subscriber line services. A method for estimating the crosstalk, identifying the sources of the crosstalk and predicting additional sources of crosstalk are disclosed. The crosstalk sources are identified in the frequency domain by maximizing the correlation with a “basis set” of received crosstalk PSDs which consist of the cascade of a finite set of known transmit PSDs types times a representative set of crosstalk couplings. Multiple crosstalk types are identified with a technique of successive spectral subtraction. Once a type is identified the crosstalk disturber is compared against all other members of the complete set for that type. Additionally, Multiple Regression (MR) techniques and a Matching Pursuit (MP) algorithm are used to increase the ability of the system and method to identify various crosstalk disturbers. The identification of the crosstalk disturber is then used to perform crosstalk cancellation and spectrum management in a DSL system. | 09-30-2010 |
20100278330 | METHOD AND DEVICE FOR PROCESSING DATA AND TO A COMMUNICATION SYSTEM COMPRISING SUCH DEVICE - A method and a device process data transmitted via a channel. The channel is at least partially represented by a symmetrical transfer matrix, wherein at least one off-diagonal matrix element of the transfer matrix is determined by its symmetric and/or transposed off-diagonal matrix element and its corresponding diagonal matrix elements of the transfer matrix. In addition, a communication system is provided containing such a device. | 11-04-2010 |
20100296648 | METHOD, DEVICE AND SYSTEM FOR LINE MANAGEMENT - A method for line management includes: acquiring running parameters of a subscriber line; computing a transmitting power spectral density, PSD, and reference virtual noise of the subscriber line according to the running parameters; activating the subscriber line according to the transmitting PSD and the reference virtual noise. A device and system for line management are provided correspondingly. Reference virtual noise needed by virtual noise technology is set rationally according to the information provided by dynamic spectrum management, DSM, Level 2 algorithm. The utilization of the virtual noise technology improves the line stability under the DSM Lever 2 algorithm, and has an effect of optimizing the subscriber line. | 11-25-2010 |
20110075834 | CROSSTALK CONTROL USING DELAYED POST-COMPENSATION IN A MULTI-CHANNEL COMMUNICATION SYSTEM - An access node of a communication system receives signals over respective first and second channels of the system, processes the signal received over the second channel and an initialization signal associated with the first channel to obtain estimated crosstalk coefficients characterizing crosstalk from the first channel into the second channel, introduces respective predetermined delays into the respective signals received over the first and second channels, and utilizes the estimated crosstalk coefficients to adjust the signal received over the second channel as delayed by the corresponding predetermined delay in order to compensate for the crosstalk from the first channel into the second channel. The first and second channels may comprise respective joining and active subscriber lines of a DSL system. | 03-31-2011 |
20120275591 | Systems and Methods for G.Vector Initialization - Methods, apparatuses (e.g., DSL system hardware, DSL systems, vectoring control entities), techniques, systems, etc. are used for initializing one or more DSL lines joining a vectored DSL line group operating in Showtime. A super-periodic orthogonal pilot sequence from a set of super-periodic orthogonal pilot sequences is assigned to each joining DSL line, wherein each such super-periodic orthogonal pilot sequence in the set has length L and is orthogonal to other sequences in the set over length T. These super-periodic orthogonal pilot sequences are used on the joining DSL lines to generate at least T sync-symbols worth of initialization data, which is processed to generate initialization data and FEXT mitigation coefficients for use when the joining DSL lines become part of the vectored DSL line group. | 11-01-2012 |
20160380673 | VECTORING ACROSS MULTIPLE CO BOXES/CARDS/DSLAMS EITHER OWNED BY THE SAME OPERATOR OR BY DIFFERENT OPERATORS - Methods, systems, and devices are described for wired communication. In one aspect, a distribution point may use a redundant number of digital subscriber line (DSL) lines that share a same cable binder to cancel crosstalk. For example a first distribution point may use a redundant number of lines, which may be virtualized lines, to cancel interference between lines controlled by the first distribution point and lines controlled by a second distribution point. In some cases, a distribution point may share precoding and cancelling coefficients with another distribution point over a cloud network or other service to enable vectoring without sharing transmitted data between the two distribution points. That is, the first distribution point may receive information related to crosstalk between sets of CPEs without receiving data transmitted by a separate distribution point sharing the same cable binder, and use the crosstalk related information to cancel crosstalk. | 12-29-2016 |