Entries |
Document | Title | Date |
20080225687 | MULTI-DOMAIN NETWORK WITH CENTRALIZED MANAGEMENT - One embodiment relates to a method for coordinating signals within a multi-domain network. At least one node within one network domain of the multi-domain network is identified, where the one node is affected by interference due to another node of another network domain of the multi-domain network. Global signals are provided to the one network domain to coordinate domain signals within that network domain to limit the interference from the another node. Other systems and methods are also disclosed. | 09-18-2008 |
20080232233 | Concept for Reducing Crosstalk - A device for reducing mutual crosstalk of a signal routed across a first line and a second signal routed across a second line, wherein by the mutual crosstalk at an output of the first line a first interfered signal may be obtained and at an output of the second line a second interfered signal may be obtained, comprising a modifier for modifying the first interfered signal that is interfered by crosstalk due to the second signal, and for modifying the second interfered signal that is interfered by crosstalk due to the first signal, wherein the modifier is adapted to model an interference due to the mutual crosstalk, and a combiner for combining the first interfered signal with the modified second interfered signal to obtain a first corrected signal and for combining the second interfered signal with the modified first interfered signal to obtain a second corrected signal. | 09-25-2008 |
20080239936 | METHOD AND APPARATUS FOR MITIGATING INTERFERENCE IN MULTICARRIER MODULATION SYSTEMS - A method and apparatus for mitigating the effect of adjacent channel interference in a multicarrier modulation system is provided. The method includes receiving an encoded signal over multiple subcarriers at different frequencies. The signal includes a plurality of pilot symbols and data symbols modulated onto the subcarriers using a modulation technique. Further, the method includes: grouping the subcarriers into multiple sets of subcarriers based on their frequencies, wherein each set includes one or more subcarriers; estimating, for each set of subcarriers, a noise value associated with at least a portion of the pilot symbols received over subcarriers included in the set; and generating a decoded signal comprising a plurality of decoded data bits, using the estimated noise values. | 10-02-2008 |
20080239937 | Mitigation of Interference and Crosstalk in Communications Systems - Signals in a multi-channel, impaired communication system are post-processed at the receiver. A triangular matrix Decision Feedback Demodulator (DFD) at the receiver extracts channels without requiring delivery of receiver parameters to the transmitter. Multi-Input Multi-Output (MIMO) processing matrices and DFD parameters are computed by first applying matrix transformations to diagonalize the noise covariance matrix of the multiple channels received at the receiver. QR decompositions (i.e., decompositions into orthogonal and triangular matrices) are then applied to the main channels to obtain triangular channel matrices. The noise-diagonalizing transformations and QR decompositions are then combined to form the MIMO postprocessing matrices and DFD parameters. MIMO postprocessing matrices and DFD parameters are computed from training data and then adapted during live data transmission. | 10-02-2008 |
20080239938 | Method and system for uplink coordinated reception in orthogonal frequency division multiple access systems - Embodiments disclose a method of coordinating reception of uplink transmissions in order to reduce interference among transceivers in an OFDM wireless transmission system, or similar communication system, including a number of receivers communicating with one or more basestations in cell or sector arrangements. A basestation within each sector includes an uplink coordinated reception process that imposes coordinated reception techniques across sector or cell boundaries in order to improve uplink transmission quality between target terminals and basestations within each sector. | 10-02-2008 |
20080239939 | Frequency domain echo and next cancellation - A cancellation system is disclosed for processing incoming and outgoing signals in a transform domain to create a cancellation signal for reducing or removing unwanted interference. Data is ordered based on Good-Thomas indexing into a two dimensional array in a buffer. The two dimensional array may have l | 10-02-2008 |
20080267055 | METHODS AND APPARATUS TO CANCEL NOISE USING A COMMON REFERENCE WIRE-PAIR - Methods and apparatus to cancel noise using a common reference wire-pair are disclosed. An example method comprises measuring a first signal present on a first wire-pair at a noise canceller, the first wire-pair to be connected to the first noise canceller and to be connected to a customer-premises digital subscriber line (DSL) modem, wherein the noise canceller and the customer-premises DSL modem are to be disposed at different customer-premises locations, and cancelling a first noise received on a second wire-pair at the noise canceller based on the first signal. | 10-30-2008 |
20090046568 | Communication Apparatus and Method - Methods and apparatuses for communication are disclosed. | 02-19-2009 |
20090059780 | METHOD AND APPARATUS FOR SELF-TUNING PRECODER - Techniques are disclosed for compensating for crosstalk using adaptation of data signals transmitted over respective channels of a communication system. For example, a method includes the following steps. A first set of estimated measures of crosstalk is obtained for at least a selected portion of a plurality of communication channels over which data signals are to be transmitted from a transmitter to at least a selected portion of a plurality of receivers. A first set of data signals based on the first set of estimated measures of crosstalk is adapted to generate a first set of adjusted data signals. The first set of adjusted data signals is transmitted to corresponding ones of the plurality of receivers. A second set of estimated measures of crosstalk is obtained for the selected portion of the plurality of communication channels. A second set of data signals for transmission based on the second set of estimated measures of crosstalk is adapted to generate a second set of adjusted data signals. Iteration of the obtaining, adjusting and transmitting steps is performed so as to reduce an error between subsequent estimated measures of crosstalk and actual measures of crosstalk for the plurality of communication channels. | 03-05-2009 |
20090059781 | METHOD AND APPARATUS FOR ICI CANCELLATION IN COMMUNICATION SYSTEMS - An apparatus capable of inter-carrier interference (ICI) cancellation in a communication system, the apparatus comprising a detecting module configured to detect an ISI-free region free from inter-symbol interference (ISI) in a guard interval (GI) of a symbol in time domain, a windowing module configured to provide a windowing function in time domain, identifying a weight value in the windowing function based on the ISI-free region, and multiplying a channel response related to the symbol by the windowing function in time domain to obtain a windowing result, wherein the windowing result comprises a first portion corresponding to the ISI-free region and a second region corresponding to an end portion of the symbol, the end portion and the ISI-free region having the same length, and a combination module configured to combine the first portion and the second portion of the windowing result in time domain. | 03-05-2009 |
20090073867 | Determining of coupling coefficients in a vector transmission system - Embodiments related to determining of coupling coefficients in a Vector transmission system are described and depicted. | 03-19-2009 |
20090073868 | Device and associated method for measuring crosstalk - The present invention relates to a crosstalk estimation device for estimating crosstalk between disturber communication lines and victim communication lines. The crosstalk estimation device is able to change the power spectral density PSD on the victim communication lines and/or the disturber communication lines. The crosstalk estimation device further receives measured changes in operational parameters on the victim communication lines and/or disturber communication lines in order to estimate the crosstalk induced in the victim communication lines and/or disturber communication lines. | 03-19-2009 |
20090080325 | Crosstalk cancellation using sliding filters - A crosstalk cancellation system and method is disclosed for use in a multi-channel communication system. Crosstalk which couples between channels is cancelled through use of an in-line FFE filter and in-line delay. A cross-connect system associated with each channel includes a cross-connect delay and cross-connect filter. The cross-connect system generates a cancellation signal for each of the channels, which is routed into a junction. The junction subtracts the cancellation signal from the received signal, which has also been delayed and filtered, to remove unwanted cross-talk. During training, cancellation magnitude is monitored at various delay offsets to determine which offset and corresponding filter coefficients, for each delay, maximizes cancellation. The filters are set with filter coefficients that maximize cancellation. The cross-connect delay with the maximum offset is set to zero and its calculated offset amount is established as the in-line delay offset. The other cross-connect delay offsets are adjusted accordingly. | 03-26-2009 |
20090092036 | Method and apparatus for estimating crosstalk - The present invention relates to a method for estimating a first parameter (|H | 04-09-2009 |
20090097388 | Method and apparatus for co-location of two radio frequency devices - A method for avoiding signal interference between a first RF device and a second RF device is provided. The first and second RF devices are co-located and the first RF device is configured to operate within a semi-stationary range of a frequency band. The second RF device is configured to operate by changing channels within the frequency band. The method initiates with a communication interface being provided between the first RF device and the second RF device. Then, the second RF device receives the semi-stationary range and a mode for the first RF device through the communication interface. Next, the second RF device is adapted to avoid the semi-stationary range of the frequency band of the first RF device when the mode of the first RF device is in an active mode. An apparatus where two RF devices are co-located without causing interference for each other is also provided. | 04-16-2009 |
20090097389 | Method And System For Training An Ethernet Channel Based On An Active Channel To Support Energy Efficient Ethernet Networks - An Ethernet link may comprise silent and active channels and may support energy efficient Ethernet communication. Training parameters from the one or more active channels may be utilized for determining and/or adjusting training parameters for silent channels prior to activation. Training parameters for silent channels may be determined based on copying training parameters from active channels. Determination of training parameters for silent channels may be based on a weighted average of the active channel training parameters. A delta between active channel training parameters from a prior time and subsequent time may be utilized to determine a correction factor for adjusting training parameters for a silent channel from a prior time. Silent channels may be adjusted based on active channel training parameters and then subsequently may be trained. Training parameters may be adjusted for one or more of an echo canceller, a near-end crosstalk canceller and a far-end canceller. | 04-16-2009 |
20090097390 | Method And System For Triggering Training For Ethernet Channels To Support Energy Efficient Ethernet Networks - An Ethernet link may comprise one or more link partners that may be communicatively coupled via one or more silent channels. One or more circuits and/or parameters corresponding to silent channels may be retrained, refreshed and/or updated based on various triggers, for example, fixed times, periodic or aperiodic time intervals, random or pseudorandom timer, events, link statistics, physical conditions such as noise, temperature level, cable type and/or cable length, communication from a corresponding link partner and/or based on programming from, for example, a layer above the physical layer. The retraining, refreshing and/or parameter updating may occur for one or more of an echo canceller, a far-end crosstalk canceller and a near-end crosstalk canceller corresponding to the one or more silent channels. Subsequent to the retraining, refreshing and/or parameter updating, the one or more silent channels may be activated and/or may remain silent. | 04-16-2009 |
20090097391 | Method And System For Monitoring And Training Ethernet Channels To Support Energy Efficient Ethernet Networks - An Ethernet link may comprise a plurality of active and/or silent channels. Training of one or more link partners for one or more silent channels may be triggered based on monitoring training parameters for an active channel. The link partners may be trained for the silent channels and link partners corresponding to the silent channels may be configured according to the training. Training parameters for an active channel may be compared to a threshold or relative change value. The threshold or relative change value may be fixed, may be based on measurement results and/or may be programmable. The link partners may be configured for silent channels for an echo canceller, a far-end crosstalk canceller and/or a near-end crosstalk canceller. The silent channels may be trained based on transmitting a pulse or LDPC frame via the silent channels. | 04-16-2009 |
20090097392 | Method And System For Monitoring Activity Of A Remote Link Partner To Trigger Training Of Ethernet Channels To Support Energy Efficient Ethernet Networks - It may be determined via monitoring whether a first link partner and/or a second link partner coupled via an Ethernet link has trained or refreshed circuitry and/or has updated at least one parameter. Based on the determination, a corresponding link partner may be trained, refreshed and/or updated. One or more of an echo canceller, a far-end crosstalk canceller and a near-end crosstalk canceller for one or more channels may be configured based on the training, refreshing and/or updating. One or more channels may be silent and/or one or more may be active. Link partners may communicate via one or more of in-band signaling, out-of-band signaling to determine which link partner may monitor and/or which may control or initiate operation. The controlling link partner may be assigned a master mode of operation. Training, refreshing and/or updating for the monitoring link partner may be based on a timer. | 04-16-2009 |
20090097393 | Method And System For Dynamically Determining When To Train Ethernet Link Partners To Support Energy Efficient Ethernet Networks - Training, refreshing and/or updating Ethernet link partners for silent channels and/or silent directions of channels may be determined based on control parameters. This may be used to improve energy efficiency in Ethernet communication. Control parameters may comprise a default value and/or may be determined based on prior training, refreshing and/or updating. New values for the control parameters may be generated based on a magnitude of change between current and prior control parameter values or based on performance such as bit error rate. User input may be utilized to determine when to execute the training, refreshing and/or updating. The training, refreshing and/or updating may be done for one or more of a near-end crosstalk canceller, alien near-end crosstalk canceller, far-end crosstalk canceller, alien far-end crosstalk canceller and echo canceller. After the training, refreshing and/or updating, the silent channels may transition to active and/or may remain silent. | 04-16-2009 |
20090097394 | METHOD AND APPARATUS FOR CANCELING CHANNEL INTERFERENCE - An apparatus for channel interference cancellation includes a first interference-cancellation module and a first cancellation-signal generating circuit. The first interference-cancellation module comprises a first processing circuit including a grouping circuit and a first transforming circuit. The grouping circuit divides received data into a plurality of groups of first sub-data. The first transforming circuit sequentially transforms the groups of first sub-data from a first domain to a second domain to generate a plurality of groups of first transformed sub-data. The first cancellation-signal generating circuit comprises a delay unit, a first processing unit and a second processing unit. The delay unit sequentially delays the groups of first transformed sub-data to generate a plurality of groups of delayed sub-data. The first and the second processing unit output a first and a second processed signal according to the groups of first transformed sub-data and the groups of delayed sub-data respectively. | 04-16-2009 |
20090109834 | NETWORK APPARATUS WITH SHARED COEFFICIENT UPDATE PROCESSOR AND METHOD THEREOF - A network apparatus with a plurality of transport ports and a shared coefficient update processor is proposed. Each of the plurality of transport ports includes a PHY module. The coefficient update processor is coupled to each PHY module and is shared by the plurality of transport ports. The coefficient update processor decides coefficients of each PHY module. The coefficient update processor is dedicated to one of the plurality of transport ports for use in a period of time. | 04-30-2009 |
20090116373 | SIGNAL PROCESSOR HAVING A SAMPLING ARRANGEMENT - In a signal processor, a sampling arrangement (SH | 05-07-2009 |
20090147666 | METHOD, SYSTEM AND DEVICE FOR xDSL CROSSTALK CANCELLATION - A method and system for xDSL crosstalk cancellation is provided. The method includes dividing xDSL signals into a plurality of signal sets; and connecting signals from a same signal set to a same processing unit to be processed. A digital subscriber line access multiplexer (DSLAM) includes a line switching control module and at least one processing unit. | 06-11-2009 |
20090175156 | Communication Apparatus and Method - Methods and apparatuses for communication are provided. | 07-09-2009 |
20090175157 | ECHO CANCELLATION DEVICE FOR FULL DUPLEX COMMUNICATION SYSTEMS - An apparatus for echo cancellation in a transceiver of a full duplex communication system, where the transceiver includes a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal, includes: an echo cancellation signal generator, coupled to the transmitter, for receiving the transmit signal and for generating an echo cancellation signal according to the transmit signal, wherein the echo cancellation signal reflects an effect of an impedance of a channel and a parasitic capacitor of the transceiver; and a calculation module coupled to the transmitter, the receiver, and the echo cancellation signal generator for receiving the receive signal and for canceling the echo of the receive signal according to the echo cancellation signal to generate an echo-cancelled signal, wherein the effect of the impedance of the channel and the parasitic capacitor of the transceiver in the echo-cancelled signal is reduced. | 07-09-2009 |
20090196161 | Combined echo and crosstalk cancellation - Combined echo and crosstalk cancellation is provided. Frequency domain adaptive filters are used to remove or reduce the effects of echo and crosstalk for a multi-channel and full-duplex communications system. Data from each transmit channel is buffered and converted to the frequency domain. The frequency domain data is multiplied by crosstalk coefficients to obtain a frequency domain correction signal for each channel. Adaptation of the crosstalk coefficients is based on correlations between the error signals and the data from each of the transmit channels. A single frequency domain transform engine, such as a Fast Fourier Transform engine, is employed for all calculations to save power and area. | 08-06-2009 |
20090196162 | UTRAN ENHANCEMENTS FOR THE SUPPORT OF INTER-CELL INTERFERENCE CANCELLATION - Systems and methodologies are described that facilitate providing uplink inter-cell interference cancellation. A radio network controller can receive measurement reports in order to identify non-serving nodes that are receiving interference from user equipment. Based on evaluation of such measurement reports, an interference message can be communicated to a Node B, wherein such measurement report can include information that allows the Node B to cancel or terminate the interference caused by such identified user equipment. | 08-06-2009 |
20090213722 | Program for Adjusting Channel Interference between Devices in a Wireless Network - The performance and ease of management of wireless communications environments is improved by a mechanism that enables access points (APs) to perform automatic channel selection. A wireless network can therefore include multiple APs, each of which will automatically choose a channel such that channel usage is optimized. Furthermore, APs can perform automatic power adjustment so that multiple APs can operate on the same channel while minimizing interference with each other. Wireless stations are load balanced across APs so that user bandwidth is optimized. A movement detection scheme provides seamless roaming of stations between APs. | 08-27-2009 |
20090231989 | Method and Apparatus for Interference Reduction - A method and apparatus for reducing interference caused by an interfering signal are disclosed for use in an access node, such as a base station, communicating with at least one mobile terminal in a wireless network, the method comprising the following steps: receiving information related to at least one data packet that is to be transmitted by a second access node to at least a second mobile terminal, receiving time-frequency information about the point in time when the at least one data packet will be transmitted from the second access node to the second mobile terminal, estimating the interfering signal based on the at least one data packet, cancelling interference based on the estimated interference signal at the point in time. This facilitates interference cancellation, especially in a network using distributed RRM. | 09-17-2009 |
20090245081 | Fast Seamless Joining of Channels in a Multi-Channel Communication System - At least one channel is joined to a group of active channels in a communication system by transmitting control signals to configure respective customer premises equipment (CPE) of the active channels into a joining mode of operation, and transmitting a joining signature sequence to CPE of the joining channel over a downstream data signal path of the joining channel. A central office (CO) or other access node of the system receives correlation results from respective active channel CPE, estimates crosstalk from the joining channel into the active channels based on the correlation results, configures a precoder based on the estimated crosstalk, and adds the joining channel to the group of active channels. The channels may comprise respective subscriber lines of a DSL communication system. | 10-01-2009 |
20090245082 | System and Methods For Cancelling Interference In a Communication System - Systems and methods for canceling interference in a communication system are described. A signal that comprises current data from a current access point and secondary data from one or more secondary access points is received. The secondary data is demodulated using one or more secondary channel estimates if a signal metric is less than a predetermined threshold. Interference in the received signal is canceled using the demodulated secondary data if the signal metric is less than the predetermined threshold. The received signal with the interference canceled is demodulated using a current channel estimate to obtain the current data. The method for interference cancellation may use the same hardware resources and processing available for receiving data from a single access point. | 10-01-2009 |
20090268601 | METHOD AND APPARATUS FOR SPECTRUM MANAGEMENT - A method and apparatus for spectrum management in an xDSL system are disclosed. The method mainly include: determining a transmit PSD mask according to a crosstalk status of a line; performing IWF operation using the transmit PSD mask; and dynamically managing line spectrum according to the result of the IWF operation. Therefore, various embodiments of the present invention allow the DSLAM performance to approximate the OSM performance without the need for a center controller and with a rather simple algorithm in a severe crosstalk scenario. Moreover, the embodiments of the present invention may help to simply the design of DSLAM optimization system and achieve a proper balance between the DSLAM performance and the complexity. | 10-29-2009 |
20090316567 | Method And System Of Communication Over Channels Of Diverse Channel Characteristics - The present invention relates to communications. More especially it relates to multiple access communications over channels of diverse channel characteristics, e.g. coherence time or rate of time variations. Particularly it relates to traffic distribution and channel allocation for efficient communications over such channels. | 12-24-2009 |
20100008213 | HOME PHONE LINE NETWORKING ENHANCEMENTS FOR MULTIPLE DWELLING UNIT ENVIRONMENTS - A Home Phoneline system operating within a Multiple Dwelling Unit includes a Home Phoneline Access Multiplexer (HPAN) that services a plurality of Home Phoneline networks, each including at least one Home Phoneline station. The HPAN synchronizes upstream and downstream transmissions to eliminate Near-Far cross-talk. According to a second operation of the present invention, the HPAN manages the transmission power of the HomePNA stations of the HomePNA networks to reduce Near-Near and Far-Far cross-talk. To optimize throughput across the whole building, station power levels are adjusted based on their location in terms of amounts of attenuation. A third method of operation according to the present invention includes adjusting the receiver sensitivity of the Home Phoneline stations according to detected or characterized levels of cross-talk within the MDU. | 01-14-2010 |
20100027407 | TRANSCEIVER AND ECHO CANCELLATION METHOD - A transceiver and an echo cancellation method are disclosed. The echo cancellation method includes producing an echo cancellation signal according to a transmission signal; adjusting the amplitude, the delay time or a combination of the amplitude and the delay time of the echo cancellation signal according to an adjusting parameter; receiving an echo signal derived from the transmission signal and performing a subtraction operation on the echo signal by using the echo cancellation signal so as to obtain an echo residual; and producing the adjusting parameter according to the echo residual. The provided method can effectively reduce the interference caused by the echo signal. | 02-04-2010 |
20100039923 | Method and System for Crosstalk Cancellation - Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel. | 02-18-2010 |
20100046355 | Communication system for improved cross talk estimation and method thereof - The present invention relates to a communication system for improved crosstalk estimation and method thereof. The communication system may include a vectoring group and a central office. The vectoring group includes a plurality of first communication lines and at least one second communication line. The plurality of first communication lines is a different type of communication line from the at least one second communication line. The central office is configured to assign the pilot sequences to each communication line within the plurality of first communication lines according to a first constraint. The central office is also configured to delay sending a sync flag in response to a request until a flag sequence of the at least one second communication line satisfies a second constraint. The assigned pilot sequences and sent flag sequences are orthogonal to each other based on the first and second constraints. | 02-25-2010 |
20100074095 | TRANSMITTER CIRCUIT TO COMPENSATE FOR INFLUENCE OF CROSSTALK NOISE IN PRE-EMPHASIS SCHEME - A transmitter circuit for transmitting parallel data, suitable for compensating for influence of crosstalk noise in a pre-emphasis scheme. The transmitter circuit includes first through N | 03-25-2010 |
20100080111 | METHOD AND SYSTEM FOR ETHERNET SWITCHING, CONVERSION, AND PHY OPTIMIZATION BASED ON LINK LENGTH IN AUDIO/VIDEO SYSTEMS - Aspects of a method and system for Ethernet Switching, Conversion, and PHY optimization based on link length in Audio/Video Systems are provided. In this regard, the length of a link over which a first communication device communicates with a second communication device may be determined and Ethernet PHY's residing in the communication devices may be configured based on the determination. One or both of the communication devices may comprise an Ethernet switch operable to switch packetized audio and/or video content. The packetized audio and/or video may be switched between the configured Ethernet PHY and one or more other Ethernet PHYs. Audio and/or video data may be received via the one or more corresponding Ethernet PHYs, the received audio and/or video data may be reformatted to be compatible with an audio and/or video interface, and the reformatted audio and/or video data may be transmitted via the audio and/or video interface. | 04-01-2010 |
20100091640 | COMMUNICATIONS DEVICE CAPABLE OF ADJUSTING POWER CONSUMED THEREBY AND METHOD THEREOF, AND ETHERNET COMMUNICATIONS DEVICE - A communications device is capable of adjusting power consumed thereby and includes a receiver and a control circuit. The receiver includes an analog-to-digital converter and a decoding circuit. The analog-to-digital converter receives receive-data from another communications device, converts the receive-data into a digital signal, and provides the digital signal to the decoding circuit for decoding. Based on the digital signal, the control circuit obtains a signaling index that indicates a communications quality of the receiver. The control circuit determines an operating state of the analog-to-digital converter and the decoding circuit in accordance with the signaling index and a receiving index. When the signaling index conforms with a reference range, the control circuit reduces a reference signal so as to reduce linearity of the analog-to-digital converter in accordance with the receiving index, and reduces a decoding capability of the decoding circuit in accordance with the receiving index. | 04-15-2010 |
20100165827 | Victim System Detector, Method of Detecting a Victim System, Wireless Communication Device and Wireless Communication Method - A victim system detector for detecting whether a second wireless communication system uses frequency bands that are used by a first wireless communication system (detecting whether the second wireless communication system is a victim system) includes a correlator and a decision unit. The correlator calculates a correlation value between a frequency domain baseband signal associated with the first wireless communication system and a correlation sequence of the second wireless communication system. The decision unit determines, based on the correlation value, whether the second wireless communication system is a victim system. Therefore, the victim system is detected accurately and efficiently. | 07-01-2010 |
20100172232 | Noise compensation in data transmission - Embodiments related to noise compensation in data transmission are described and depicted. | 07-08-2010 |
20100172233 | Method and Device for Processing a Channel and Communication System Comprising Such Device - A method and a device for processing a channel are disclosed. The channel is represented by a MIMO (multiple-input-multiple-output) system having first coefficients associated with transmission lines and second coefficients in particular associated with crosstalk. The method includes (i) clustering of the coefficients of the second coefficients; and (ii) processing of the clustered coefficients. | 07-08-2010 |
20100195478 | Cross-Talk Coefficient Updating In Vector Transmission - Embodiments related to far-end cross-talk coefficient updating in vector transmission systems are depicted and described herein. | 08-05-2010 |
20100202281 | Simultaneous Estimation of Multiple Channel Coefficients Using a Common Probing Sequence - An access node of a communication system comprises a plurality of transmitters adapted for communication with at least one receiver. The access node is operative to simultaneously estimate channel coefficients between multiple ones of the transmitters and the receiver, and to utilize the estimated channel coefficients to control at least one data signal sent by at least one of the multiple transmitters to the receiver. In the process of simultaneously estimating the channel coefficients, the access node transmits a plurality of distinct probing signals, each of which is generated based on a distinct combination of a common probing sequence and a selected one of a plurality of different frequency expansions. The access node may comprise at least a portion of at least one central office of a DSL communication system. | 08-12-2010 |
20100208577 | COMMUNICATION APPARATUS WITH ECHO CANCELLATION AND METHOD THEREOF - A communication apparatus with echo cancellation includes a transmitter, a receiver, a digital echo cancellation circuit, a parameter control circuit, and an analog echo cancellation circuit. The digital echo cancellation circuit determines an echo estimation component according to a digital output signal, and performs a digital echo cancellation on a digital input signal according to the echo estimation component. The parameter control circuit generates a control signal according to the echo estimation component. The analog echo cancellation circuit includes a first echo cancellation resistor and a second echo cancellation resistor, wherein the resistances of the first echo cancellation resistor and the second echo cancellation resistor are adjusted according to the control signal. | 08-19-2010 |
20100214906 | Method And System For Dynamically Determining When To Train Ethernet Link Partners To Support Energy Efficient Ethernet Networks - Training, refreshing and/or updating Ethernet link partners for silent channels and/or silent directions of channels may be determined based on control parameters. This may be used to improve energy efficiency in Ethernet communication. Control parameters may comprise a default value and/or may be determined based on prior training, refreshing and/or updating. New values for the control parameters may be generated based on a magnitude of change between current and prior control parameter values or based on performance such as bit error rate. User input may be utilized to determine when to execute the training, refreshing and/or updating. The training, refreshing and/or updating may be done for one or more of a near-end crosstalk canceller, alien near-end crosstalk canceller, far-end crosstalk canceller, alien far-end crosstalk canceller and echo canceller. After the training, refreshing and/or updating, the silent channels may transition to active and/or may remain silent. | 08-26-2010 |
20100226241 | CROSS-TALK PROCESSING IN SERIAL LINK BUSES - A system and method for cross talk compensation in serial link busses, the method comprising: evaluating if a positive potential or a negative potential is being received by a receiver of a victim from an aggressor is dominant; measuring the distance between an incident signal and a decision threshold to obtain a positive or negative value; and using the positive or negative sign as a recovered bit value if positive potential or a negative potential is being received by a receiver of a victim from an aggressor is not dominant and using the sign of the positive potential or a negative potential that is being received by a receiver of a victim from an aggressor if this is dominant. | 09-09-2010 |
20100238785 | Cancellation of Crosstalk Energy in Communication Loops - Systems and methods for reducing crosstalk are provided. In one implementation, a method is provided. The method includes applying a pilot signal to a disturber twisted pair and measuring near end crosstalk of a victim twisted pair. The coupling characteristics between the disturber and the victim twisted pair are determined. A far end crosstalk function is derived for estimating the far end crosstalk in the victim twisted pair using the determined coupling characteristics. A crosstalk reduction signal is determined using the estimated far end cross talk. The crosstalk reduction signal is injected into the victim twisted pair to reduce crosstalk in the victim twisted pair. | 09-23-2010 |
20100265813 | WIRELESS NETWORK AND METHOD FOR ADAPTIVE OPPORTUNISTIC CLUSTERING FOR INTERFERENCE ALIGNMENT IN WIRELESS NETWORKS - Embodiments of a central scheduler and method for adaptive clustering are generally described herein. In some embodiments, a cluster of transmitter-receiver pairs is selected based on minimum singular values calculated from direct channel information and the selected pairs are instructed to perform an interference alignment technique. | 10-21-2010 |
20100278033 | Method, Apparatus and System for Estimating Channel Transfer Matrices - A method, system and device for use in conjunction with Digital Subscriber Line (DSL) transmission systems, including Far-End Crosstalk (FEXT) cancellation circuitry. According to embodiments of the invention there is provided a system including a central office having a plurality of central modems, and at least one remote modem in communication with the plurality of central modems, the remote modem capable of automatic channel adjustment, and further capable of providing to the central office a channel adjustment parameter, wherein the central office includes a precoder to selectively precode symbols prior to transmission by each of the central modems with an estimation precoding matrix, and a controller to receive from the at least one remote modem respective channel adjustment parameters in response to transmitted symbols precoded with said estimation precoding matrix. | 11-04-2010 |
20100290333 | METHOD FOR ENHANCING ETHERNET CHANNEL IMPAIRMENT AND APPARATUS USING THE SAME - A method for enhancing Ethernet channel impairment comprises the steps of sending a sequence to a receiver in a slave transceiver by a master transceiver, and training cancellation filter coefficients of an echo canceller and a near-end cross talk canceller in the master transceiver before the receiver of the slave transceiver converges. | 11-18-2010 |
20100302929 | Method and Device for Data Processing and Communication System Comprising Such Device - Method and device for data processing and communication system with such a device. The method and the device allow data processing via at least one channel. The method includes the following step of transmitting an idle pattern across the at least one channel when no information is conveyed. The idle pattern is created such that interference and/or crosstalk resulting from the idle pattern can be reduced at the receiving side. | 12-02-2010 |
20100309774 | METHOD AND APPARATUS FOR CROSS-TALK CANCELLATION - The present invention addresses the problem of a second (or higher) order representation of a transmit signal which is transmitted by a transceiver being mixed into the region of the frequency spectrum of interest to the transceiver receiver, such that it can not then be spectrally filtered out. At its most straightforward, in one embodiment of the invention this is achieved by providing a cross-talk cancellation unit which takes the transmit signal, and obtains the second (or higher) order representation thereof. This representation is then subtracted from the received signal before the signal is passed to the radio control receiver signal processing elements. However, in a more preferred arrangement a filter is also provided, to filter the second or higher order version of the transmit signal, prior to its being subtracted from the received signal. The filter basically takes out the effects of any other filtering or processing which has happened to the transmit signal in the receiver signal chain. This would be, for example, the filtering effects provided by the anti-aliasing filter in the receiver. | 12-09-2010 |
20100315939 | NETWORK-SPECIFIC POWERLINE TRANSMISSIONS - A method for a network device of a powerline communications network includes selecting between a default preamble signal and a network-specific preamble signal specific to the network but not to a neighboring network and transmitting at least user data in conjunction with the selected preamble signal. Another method for a network device of a powerline communications network includes tuning a sensor to detect network-specific preamble signals specific to the network but not to a neighboring network and receiving at least user data associated with the preamble signals. | 12-16-2010 |
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 |
20110044158 | Cross-Talk Cancellation in Cooperative Wireless Relay Networks - Cross-talk is canceled in a cooperative wireless relay network that includes a base station (BS), a relay station (RS), and a mobile station (MS). A coupling channel between a transmit antenna and a receive antenna colocated at the RS is estimated. Cross-talk interference determination is based on a previous transmitted signal by the transmit antenna, and the coupling channel. The cross-talk interference is subtracted from a currently received signal by the receive antenna to obtain a residual signal. The residual signal is then transmitted as a next transmitted signal by the transmit antenna. | 02-24-2011 |
20110058468 | Method and apparatus for crosstalk cancellation during SELT testing - A system for performing a single ended line test (SELT) of a selected subscriber line within a bundle of in-service subscriber lines each supporting frequency division multiplexed multi-tone modulated XDSL communications. The system comprises: a crosstalk cancellation module and a SELT module. The crosstalk cancellation module is coupled to the subscriber lines and configured to cancel crosstalk between the selected subscriber line under test and the in-service subscriber lines. The SELT module couples to the crosstalk cancellation module and is configured to coordinate SELT testing with the crosstalk cancellation module to cancel crosstalk between the selected subscriber line and the in-service subscriber lines during testing. | 03-10-2011 |
20110069604 | Method and System for Signal Emulation - A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay. | 03-24-2011 |
20110090782 | METHOD AND DEVICE FOR DATA PROCESSING AND COMMUNICATION SYSTEM COMPRISING SUCH DEVICE - In a method and a device for data processing at a network component the following steps are carried out: a multiple-input-multiple-output processing is conducted and based on such processing a crosstalk and/or interference is at least partially reduced or cancelled. The device may be incorporated into a communication system. | 04-21-2011 |
20110116357 | Power Dissipation Management for Wired Transceivers - A system, method and apparatus for reducing a power consumed by a physical layer device (PHY). A length of a cable connecting the PHY to a link partner is determined. Based on the length, power provided to one or more components of the PHY, or any portion thereof, is reduced. The power provided is reduced while maintaining a level of reliability specified by a protocol governing operation of the PHY. The length can be determined using time-domain reflectometry (TDR) techniques. Any portion of an echo cancellation filter, a crosstalk filter, an equalizer, a precoder, an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a forward error correction (FEC) decoder and/or an FEC coder can be powered-down or power-optimized to reduce the overall power consumed by the PHY. The protocol governing operation of the PHY can be IEEE 802.3. | 05-19-2011 |
20110134746 | METHOD OF REDUCING INTERFERENCE BETWEEN TWO COMMUNICATION SYSTEMS OPERATING IN ADJACENT FREQUENCY BANDS - A method of reducing interference between two communication systems operating in adjacent frequency bands and coexisting in a communication device is provided, and the two communication systems are a first communication system using TDD and a second communication system which is content-based. The method includes deciding whether to perform an arbitration procedure on a downlink subframe of the first communication system according to a CINR of the first communication system and a RSSI of the second communication system; deciding whether to perform the arbitration procedure on an uplink subframe of the first communication system according to a transmit power of the first communication system and a RSSI value of the second communication system; and when deciding to perform the arbitration procedure on the downlink or uplink subframe, further deciding whether to send a specific packet to request one or more stations not to send packets to the second communication system. | 06-09-2011 |
20110141875 | COMBINED ECHO AND CROSSTALK CANCELLATION - Combined echo and crosstalk cancellation is provided. Frequency domain adaptive filters are used to remove or reduce the effects of echo and crosstalk for a multi-channel and full-duplex communications system. Data from each transmit channel is buffered and converted to the frequency domain. The frequency domain data is multiplied by crosstalk coefficients to obtain a frequency domain correction signal for each channel. Adaptation of the crosstalk coefficients is based on correlations between the error signals and the data from each of the transmit channels. A single frequency domain transform engine, such as a Fast Fourier Transform engine, is employed for all calculations to save power and area. | 06-16-2011 |
20110149714 | METHOD AND APPARATUS FOR ADAPTIVE NON-LINEAR SELF-JAMMING INTERFERENCE CANCELLATION - Certain embodiments of the disclosure propose a method for cancelling co-channel interference (self-jamming) generated by nonlinearities in the radio-frequency (RF) front-end devices. The proposed method utilizes an adaptive non-linear filter to generate a distorted version of the transmitted signal. The self-jamming interference may be mitigated utilizing the distorted signal through adaptive cancellation. | 06-23-2011 |
20110158081 | Remote radio head unit system with wideband power amplifier and method - A remote radio head unit (RRU) system for multiple operating frequency bands, multi-channels, driven by a single or more wide band power amplifiers. More specifically, the present invention enables multiple-bands RRU to use fewer power amplifers in order to reduce size and cost of the multi-band RRU. The present invention is based on the method of using duplexers and/or interference cancellation system technique to increase the isolation between the transmitter signal and receiver signal of the RRU. | 06-30-2011 |
20110182168 | INTERACTION BETWEEN ECHO CANCELLER AND PACKET VOICE PROCESSING - System and method for processing communication signals in a communication system having a detector for detecting a parameter of a communication signal. A communication signal is provided to a non-linear processor (NLP) adapted to examine the signal and to decide whether or not to enter an active state based upon a parameter of the signal. If the NLP enters an active state, the NLP performs non-linear processing on the signal. The NLP communicates to the detector whether the NLP is active or inactive. If the NLP is active, a processing step of the detector is disabled. | 07-28-2011 |
20110235499 | SYSTEM AND METHOD FOR ECHO SUPPRESSION IN WEB BROWSER-BASED COMMUNICATION - A system and method for performing echo suppression on a server in browser-based online audio conferences without downloading or installing software on a participant's computing device is disclosed. Streams of audio communication data from the participants in an audio conference are received at the server. An echo suppression application determines the first party that speaks by analyzing the streams to locate speech data, and assigns that party as the “owner” of the audio channel. The speech data is sent to the other participants in the conference. The application then determines whether newly received audio from the owner of the channel is new speech; if so, then the party remains the owner of the channel, and the new speech data is also sent to the other parties in the conference. The channel is surrendered if no new speech is received from the owner in a defined period, and the next party that speaks becomes the new owner of the channel. The other audio data from the participants is replaced by silence. | 09-29-2011 |
20110235500 | Integrated echo canceller and speech codec for voice-over IP(VoIP) - A method includes operating an integrated echo canceller and speech codec for voice-over internet protocol. An apparatus includes an echo canceller and a speech codec, wherein the speech codec includes a decoder and an encoder, and wherein the echo canceller and the speech codec are integrated for voice-over-internet protocol. | 09-29-2011 |
20110261673 | MODIFIED SPATIAL DIVERSITY SCHEMES FOR COVERAGE ENHANCEMENT - In one aspect, a method to enhance coverage in a heterogeneous wireless network wireless communication is disclosed. The method includes generating a reference signal indicating a plurality of transmit antenna ports and generating modulation symbols. Modulation symbols are assigned to each of the plurality of transmit antenna ports, in accordance with a spatial diversity coding scheme for the plurality of transmit antenna ports. At least one of the modulation symbols assigned to at least one of the plurality of transmit antenna ports is muted prior to transmission in accordance with the spatial diversity coding scheme. The non-muted modulation symbols and the reference signal are transmitted on the other of the plurality of transmit antenna ports. | 10-27-2011 |
20110261674 | Method And Apparatus For Configuring A Multi-Carrier Data Communication Path - The present invention relates to a method for configuring communication parameters for communication through a first multi-carrier data communication path (DPx) established over a first subscriber line (Lx), and comprising the steps of:
| 10-27-2011 |
20110267936 | DATA TRANSMISSION CIRCUIT AND DATA TRANSMISSION/RECEPTION SYSTEM - A data transmission/reception system includes a data transmission circuit and a data reception circuit. The data transmission circuit includes a pattern detection unit configured to detect a pattern of data to be loaded on inner lines among a plurality of transmission lines and generate an inversion signal, and a transmission unit configured to transmit data to the plurality of transmission lines and the inversion signal to an inversion line, and invert some of the data to be loaded on the inner lines in response to the inversion signal. The data reception circuit is configured to invert the data inverted by the transmission unit among the data transferred to the plurality of transmission lines, in response to the inversion signal. | 11-03-2011 |
20110267937 | INTERFERENCE CANCELLATION - A method to enhance coverage and/or throughput in a heterogeneous wireless network includes detecting interference between a neighboring cell and a serving cell. The method also includes cancelling the interference using an adaptive technique based on whether the interference has colliding Common Reference Signal (CRS) tones. | 11-03-2011 |
20110292783 | METHOD AND DEVICE FOR DATA PROCESSING - A method and a device for data processing. The data processing method utilizes at least two probing coefficients in a canceller and/or precompensator in combination with SNR feedback to process data in the canceller and/or in the precompensator. | 12-01-2011 |
20120026860 | APPARATUS AND METHOD FOR CROSS PHASE MODULATION RECOVERY - Apparatus and method for cross phase modulation recovery are disclosed. An apparatus for cross phase modulation recovery may include M stages of cross phase modulation recovering devices connected in cascade, wherein M≧2, and each stage of the M-stages of cross phase modulation recovering devices is configured to perform cross phase modulation recovery to a polarization de-multiplexed signal input into the each stage. An optical coherent receiver including such an apparatus for cross phase modulation recovery is also disclosed. | 02-02-2012 |
20120063291 | CDMA-BASED CROSSTALK CANCELLATION FOR ON-CHIP GLOBAL HIGH-SPEED LINKS - Synchronous CDMA/spread spectrum methods, devices, and systems are used to suppress crosstalk in clock-forwarded on-chip interconnects. Transmitting a spread spectrum signal across on-chip interconnects for recovery at the terminus permit integrated chip designers to overcome the effects of capacitive cross-talk between adjacent data bus lines. The methods, devices, and systems provided herein improve cross-talk immunity between adjacent high speed signal lines by applying synchronous CDMA spread spectrum techniques to some or all of the high speed signal lines. Other methods, devices, and systems provided herein apply synchronous CDMA spread spectrum techniques to the concept of sending phantom signals to reduce the number of signal lines used to carry data. | 03-15-2012 |
20120075984 | METHOD AND APPARATUS FOR ESTIMATING FAR-END CROSSTALK CHANNEL - The method is used for estimating a Far-End Crosstalk channel imposed by a first line onto a second line in a two-line pair scenario, and includes: activating a first line independently, and obtaining a line noise of the first line as a first line noise; activating the first line and a second line, and obtaining a line noise of the first line as a second line noise; and determining a Far-End Crosstalk channel imposed by the second line onto the first line to be: (the second line noise−the first line noise)/a transmit power spectral density of the second line, where the transmit power spectral density of the second line is known. | 03-29-2012 |
20120082022 | METHOD AND APPARATUS FOR INFERRING USER EQUIPMENT INTERFERENCE SUPPRESSION CAPABILITY FROM MEASUREMENTS REPORT - UE that are able to cancel interference from CRS, a PDSCH, a PDCCH, or a PCFICH may do so without explicitly signaling the capability to the serving eNB. The serving eNB may transmit to the UE a plurality of cell identifiers to indicate from which cells interference should be canceled. The UE receives CRS, PDSCH, PDCCH, or PCFICH from the serving eNB and cancels CRS, PDSCH, PDCCH, or PCFICH interference, respectively from the signal received from the eNB. The UE cancels the interference from the cells that correspond to the cell identifiers. The UE may then transmit a report to the eNB with a quality measurement without the interference. | 04-05-2012 |
20120087229 | System and Method for Coordination of Neighboring Networks on Wireline Communication Channels - Embodiments of system and method for coordination among neighboring networks for communications over shared physical medium are provided. In one aspect, a method comprises determining, by a first domain master of a first network domain, a first number of network nodes of the first network domain that interfere with data transmission on the physical medium by at least one network node of at least one other network domain, or a second number of network nodes of the at least one other network domain that interfere with data transmission on the physical medium by at least one network node of the first network domain. The method further comprises causing, by the first domain master, one or more network nodes of the first network domain to transmit data during one of a plurality of non-overlapping time slots of a MAC cycle. | 04-12-2012 |
20120106315 | Efficient Generation of Compensated Signals for Crosstalk Control in a Communication System - An access node of a communication system is configured to control crosstalk between channels of the system. Vectoring circuitry in the access node estimates crosstalk between channels of the system, generates a compressed representation of the crosstalk estimates, and generates compensated signals based on the compressed representation of the crosstalk estimates. The compressed representation comprises a value array and an index array, with the value array comprising selected values from each of a plurality of rows of a matrix representation of the crosstalk estimates, and the index array identifying locations of the selected values in the matrix representation of the crosstalk estimates. The compensated signals may be pre-compensated signals or post-compensated signals. | 05-03-2012 |
20120106316 | Method and Apparatus for Cross-Talk Cancellation in Frequency Division Multiplexed Transmission Systems - A method and apparatus are disclosed for canceling cross-talk in a frequency-division multiplexed communication system. The disclosed frequency-division multiplexed communication system employs multiple carriers having overlapping channels and provides an improved cross-talk cancellation mechanism to address the resulting interference. Bandwidth compression is achieved using n level amplitude modulation in each frequency band. An FDM receiver is also disclosed that decomposes the received broadband signal into each of its respective frequency bands and returns the signal to baseband in the analog domain. Analog requirements are relaxed by removing cross-talk from adjacent RF channels, from image bands, and minimizing the performance degradation caused by In-phase and Quadrature-phase (I/Q) phase and gain mismatches in modulators and demodulators. The disclosed transmitter or receiver (or both) can be fabricated on a single integrated circuit. | 05-03-2012 |
20120113794 | MULTIPLE USER MIMO INTERFERENCE SUPPRESSION COMMUNICATIONS SYSTEM AND METHODS - Systems and methods for providing an efficient mechanism for transmitting interference vectors to communications terminals, such as user equipments (UEs), in an over the air radio telecommunications network with spatially multiplexed multiple user multiple input multiple output (MU-MIMO) capability. A new pre-coding information downlink channel is defined. Messages containing semi-persistent interference vector information for MU-MIMO user equipment are defined and transmitted over the new channel in a manner that allows infrequent transmission and efficient use of resources. Using the interference vectors and applying inter-user interference adaptation to received messages, the UEs may receive spatially multiplexed MIMO transmissions and actively remove inter-user interference after reception of the messages. Compression of the pre-coding vector information transmitted over the pre-coding information channel may result in additional increases in efficiency in the system. | 05-10-2012 |
20120195183 | MULTIPLICATIVE UPDATING OF PRECODER OR POSTCODER MATRICES FOR CROSSTALK CONTROL IN A COMMUNICATION SYSTEM - An access node of a communication system is configured to control crosstalk between channels of the system. Vectoring circuitry in the access node estimates crosstalk between channels of the system, generates a compensation matrix based on the crosstalk estimates, and generates compensated signals based on the compensation matrix. The compensation matrix, which may be a precoder matrix or a postcoder matrix, is generated using a multiplicative update process in which a previous version of the compensation matrix comprising one or more non-zero off-diagonal elements is updated by at least one of pre-multiplying by a first auxiliary matrix and post-multiplying by a second auxiliary matrix, with a given one of the auxiliary matrices also comprising one or more non-zero off-diagonal elements. The compensated signals may be pre-compensated signals or post-compensated signals. | 08-02-2012 |
20120230176 | RECEIVE BAND NOISE CANCELLATION METHOD AND APPARATUS - A method and apparatus for eliminating receive band noise in a communication system is provided. The method comprises sensing a transmit signal at a receive frequency, wherein the signal sensed is a bleed over signal from a transmit signal. The sensed bleed over signal is then digitized using a secondary receiver. This secondary receiver utilizes a separate path from the primary receive path. The next step in the method is to estimate the linear distortion, delay, attenuation in the sensed bleed over signal. Next, compensation for the linear distortion, delay, and attenuation are performed on the sensed bleed over signal. The sensed, digitized, and compensated bleed over signal is then cancelled from the primary receive path. | 09-13-2012 |
20120250490 | SYSTEMS AND METHODS FOR BYPASSING FAILED LINE CARDS IN MULTI-CARD VECTORING GROUPS - A communication system comprises a plurality of line cards having transceivers coupled to a plurality of subscriber lines. Each line card has at least one active transceiver within the same vectoring group, and each line card also has vector logic capable of cancelling crosstalk induced by an active transceiver that is a member of the vectoring group. Further, the line cards are coupled to one another via a ring connection across which vectoring information is passed from one line card to the next. In the event of a failure of one of the line cards, the failed card is bypassed by the vectoring stream so that the operational line cards can continue crosstalk vectoring operations despite such failure. | 10-04-2012 |
20120250491 | SYSTEMS AND METHODS FOR ADJUSTING TIME SLOTS OF VECTORING STREAMS BASED ON BIT LOADING - A communication system comprises a plurality of line cards having transceivers coupled to a plurality of subscriber lines. Each line card has at least one transceiver within the same vectoring group, and each line card also has vector logic capable of cancelling crosstalk induced by a tone communicated by any member of the vector group. Further, the line cards are coupled to one another via a data connection across which a vectoring stream carrying vectoring information from one line card to the next. The bandwidth of the vectoring stream is reduced by dynamically adjusting time slots of the vectoring stream based on bit loading for the communicated tones. | 10-04-2012 |
20120250492 | SYSTEMS AND METHODS FOR MOVING DSL LAUNCH POINTS - A system for scaling vectored DSLAM deployments has a DSLAM interfaced with a cross-connect apparatus. The DSLAM receives POTS signals from at least one bridge connection assembly. When a DSLAM is added at the cross-connect facility, at least one connector of the bridge connection assembly is disconnected from an existing DSLAM and is interfaced with the newly-added DSLAM. By moving the connector to the newly-added DSLAM, a batch of downstream distribution pairs (which are preferably bound by a single distribution cable) are effectively moved from the existing DSLAM to the new DSLAM without having to reconfigure the jumpers of the cross-connect apparatus. Accordingly, it is possible to scale the cross-connect facility to any number of vectored DSLAMs while limiting vector group sizes, thereby reducing the complexity of vectoring operations, without having to perform complex reconfigurations of the cross-connect apparatus. | 10-04-2012 |
20120263030 | Method and System for a Programmable Interference Suppression Module - Aspects of a method and system for a programmable interference suppression module may include receiving a communication signal comprising one or more desired signal, and one or more undesired signals. The communication signal may be utilized to generate estimated channel state information. The estimated channel state information may be formatted for use in interference suppression. A reduced interference signal may be generated from a delayed version of said communications signal and the estimated channel state information, wherein the one or more undesired signals may be attenuated. The reduced interference signal may be formatted for post-processing. The desired signals may comprise WCDMA and/or HSDPA signals, and the undesired signals may be inter-cell and/or intra-cell interference. Further processing may comprise HSDPA processing and/or RAKE finger processing. The communication signal may be a Universal Mobile Telecommunication System (UMTS) compliant signal. | 10-18-2012 |
20120281519 | Method and System for Extended Reach Copper Transceiver - Aspects of a method and system for an extended range copper transceiver are provided. Reducing the communication rate provided by multi-rate physical (PHY) layer operations in an Ethernet transceiver may extend the range of the Ethernet transceiver over twisted-pair copper cabling from a standard connection length. The Ethernet transceiver may support up to 1 Gbps or up to 10 Gbps transmission rate over copper cabling. The multi-rate PHY layer architecture in the Ethernet transceiver may support signal-processing operations, such as echo cancellation and/or equalization, which may be applied to the reduced communication rate to enable range extension. The reduced communication rate may be achieved by reducing the symbol rate provided by the multi-rate PHY layer operations. Reducing the communication rate may also enable utilizing greater insertion loss cabling for a standard connection length. | 11-08-2012 |
20120287769 | RESOURCE EFFICIENT ACOUSTIC ECHO CANCELLATION IN IP NETWORKS - System and methods provide acoustic echo monitoring and cancellation for real time media processing in an internet protocol (IP) media server in an IP network. An echo monitor is configured to selectively compare audio streams into and out of the IP media server through a selected port. The comparison determines an occurrence of an echo. An echo canceller in communication with the echo monitor is configured to respond to the determination by the echo monitor so as to remove the echo from at least one of the audio streams. A talk burst detector may be used to detect speech in at least one of the audio streams through the selected port. The echo monitor selectively compares the audio streams in response to a signal from the talk burst detector that indicates detection of speech. | 11-15-2012 |
20120320729 | APPARATUS AND METHOD FOR RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A technique for avoiding reception performance deterioration caused by a tone interference that occurs at a position carrying a pilot signal in a wireless communication system is provided. A receiving end includes an operator for converting a time-axis signal into a frequency-axis signal, an extractor for generating channel values in positions carrying pilot signals among the frequency-axis signals, a compensator for compensating for a channel value of a position at which tone interference occurs by using at least one channel value of a position at which no tone interference occurs among the channel values. | 12-20-2012 |
20130010585 | SYSTEMS AND METHODS FOR COMMUNICATING AMONG NETWORK DISTRIBUTION POINTS - A communication system has a trunk extending from a network facility, such as a central office, with a plurality of distribution points positioned along the trunk. Each leg of the trunk defines a shared channel that permits peak data rates much greater than what would be achievable without channel sharing. As an example, the connections of each respective trunk leg may be bonded. Further, the same modulation format and crosstalk vectoring are used for each leg of the trunk. The crosstalk vectoring cancels both far-end crosstalk (FEXT) that couples between connections of a given trunk leg and crossover crosstalk that couples between one trunk leg and another. In addition, logic determines an amount of excess capacity available for each leg of the trunk and controls error correction based on the determined excess capacity. | 01-10-2013 |
20130044579 | WIRELESS USER EQUIPMENT FOR USE IN REDUCING CROSS CELL INTERFERENCE - A method for reducing cross cell interference in a wireless time division duplex communication system using code division multiple access, the system having at least one user equipment (UE) and a base station (BS) is disclosed. The method begins by measuring an interference level of each timeslot at the BS. A timeslot is eliminated for additional uplink communication if the measured interference level exceeds a first threshold. UEs in nearby cells that are large interferers are identified and their downlink timeslot usage is gathered. A timeslot is eliminated for uplink communication for a large interferer UE that uses the timeslot for downlink communication. | 02-21-2013 |
20130064064 | Systems and Methods for Minimizing Insertion Loss in a Multi-Mode Communications System - Methods and system for using a multifunctional filter to minimize insertion loss in a multimode communications system are described. Specifically described is a multifunctional filter that is configurable to operate in a bandpass mode when a first type of signal is propagated through the multifunctional filter, and to operate in a lowpass mode when a second type of signal is propagated through the multifunctional filter. The multifunctional filter presents a lower insertion loss to the second type of signal when operating in the lowpass mode than in the bandpass mode. | 03-14-2013 |
20130064065 | Transceiver with Automatic Detection of Unshielded Twisted Pair or Shielded Twisted Pair Cabling - Typical transceivers have multiple near-end and multiple far-end crosstalk cancellation filters. Crosstalk cancellation is one of the largest contributors to power dissipation in the DSP portion of high speed Ethernet transceivers. By detecting the cable type, a transceiver could automatically turn off its crosstalk cancellation filters when driving shielded twisted pair (STP) cables and substantially reduce the overall power dissipation in this configuration. Adaptive digital crosstalk cancellers automatically adjust the coefficients of a digital filter to match the coupling function between two channels. The impulse response of an optimal crosstalk cancellation filter can be used to determine a metric indicating the amount of coupling between the two channels. STP cables will have a much lower amount of coupling between wire-pairs than unshielded twisted pair cables. | 03-14-2013 |
20130070579 | VOICE PACKET DYNAMIC ECHO CANCELLATION SYSTEM - A voice packet dynamic echo cancellation system includes an input/output unit configured to communicate over a packet network and a storage unit configured to store network performance information associated with node segments on the packet network. The system also includes a processing unit configured to execute instructions to: set-up a call from an originating call device to a terminating call device; determine the network performance of the call between the originating call device and the terminating call device; locate an echo signal of the call to the originating call device based on the network performance; produce a echo cancellation signal based on the echo signal; cancel the echo signal with the echo cancellation signal; and recheck the network performance information during a duration of the call and adjust the specific delay point of the received signal window based on the network performance information. | 03-21-2013 |
20130114390 | NETWORK APPARATUS AND METHOD FOR ELIMINATING INTERFERENCE BETWEEN TRANSPORT PORTS - A network apparatus for eliminating interference between transport ports includes a plurality of transport ports, a plurality of seed comparators, and a control unit. The plurality of seed comparators are coupled to the plurality of transport ports, respectively, wherein a first seed comparator is utilized for comparing a first seed of a first transport port with a second seed of a second transport port and accordingly generating a comparing result. The controlling unit is coupled to the plurality of seed comparators and the plurality of transport ports, for generating a control signal to cancel interference between the plurality of transport ports according to the comparing result. | 05-09-2013 |
20130128716 | Method and Apparatus for Band Separation for Multiband Communication Systems - Aspects of a method and apparatus for band separation for multiband communication systems are provided. One or more circuits for use in a transceiver may comprise a triplexer and a leakage processing module. The triplexer may comprise a multiband port, a Multimedia Over Coaxial Alliance (MoCA) port, a television upstream port, and a television downstream port. The leakage processing module may comprise a television downstream input port, a cable television downstream output port, a MoCA port, and a cable television upstream port. The leakage processing module may be operable to (1) process a MoCA signal to generate a first compensation signal; (2) process a cable upstream signal to generate a second compensation signal; (3) process a filtered signal based at least in part on the first and second compensation signals; and (4) output the processed filtered signal via the cable television downstream output port of said leakage processing module. | 05-23-2013 |
20130135983 | METHOD AND SYSTEM FOR INTERFERENCE AVOIDANCE IN A MULTIPROTOCOL COMMUNICATION SYSTEM - Methods and systems for interference avoidance in a multi-protocol communication system may comprise receiving signals in a first communications protocol (FCP) in a first frequency range (FFR), configuring channel usage in a second communications protocol (SCP) in a second frequency range (SFR) based on the received signals to control interference from the SFR to the FFR. Signals may be communicated over coaxial cables based on the configuration of channel usage in the SCP in the SFR based on the received signals, such that aliased signals do not excessively degrade performance of the FCP. The FFR may comprise a cable or satellite television frequency range. The FCP may comprise data over cable service interface standard (DOCSIS). The SCP may comprise multimedia over coaxial alliance (MoCA) standard. The configuring channel usage in the SCP may comprise varying bit loading, power levels, or degree of modulation of signals transmitted over the SCP. | 05-30-2013 |
20130142030 | FREQUENCY DOMAIN ECHO AND NEXT CANCELLATION - A cancellation system is disclosed for processing incoming and outgoing signals in a transform domain to create a cancellation signal for reducing or removing unwanted interference. Data is ordered based on Good-Thomas indexing into a two dimensional array in a buffer. The two dimensional array may have l | 06-06-2013 |
20130208579 | COMMUNICATION METHOD, APPARATUS AND SYSTEM - Various embodiments are presented of a time sharing electronic communication system, including a central unit, a crosstalk channel, and communication units such as transceivers and remote terminals. Also presented are various methods for configuring and operating the elements of such a system to enhance communication between communication units within the system. In some embodiments, locally optimal configurations are pre-computed, stored in memory, and processed into time sharing information which is communicated to communication units. The time sharing information allows the communication units to transmit at times and power levels in such a manner as to enhance the communication within the system. In some embodiments, locally optimal configurations are computed, stored, and processing, substantially dynamically, allowing substantially real time adjustment of transmission times and power levels to enhance the communication within the system. | 08-15-2013 |
20130229905 | ADAPTIVE MONITORING OF CROSSTALK COUPLING STRENGTH - The disclosure relates to a method of reducing crosstalk in a crosstalk cancelation system. The method comprises at least the steps of applying to the at least one first signal a crosstalk cancelation according to a set of crosstalk coefficients; monitoring crosstalk received in the at least one first signal at a first end of the first path during the application of the crosstalk cancelation; and updating the crosstalk coefficients during the monitoring. The disclosure also includes a device, which can carry out the method. | 09-05-2013 |
20130265864 | EFFICIENT BANDWIDTH UTILIZATION METHODS FOR CATV DOCSIS CHANNELS AND OTHER APPLICATIONS - Methods to improve the data carrying capacity of CATV DOCSIS systems and other communications systems are disclosed. Communications channels may be more efficiently spaced with reduced or absent guard bands by using receivers with adaptive signal cancellation methods, equalizing circuits, or polyphase filter banks and Fast Fourier Transform signal processing methods to correct for higher levels of cross-talk. QAM type communications channels may also be utilized on a synchronized two-transmitter at a time basis by adjusting the transmitters to predefined signal levels, such as +1, −1, +½, −½ to enable the combined signals to be distinguished at the receiver. These two methods may be combined to create a still higher data throughput system. | 10-10-2013 |
20140029406 | Time Division Multiple Access Far End Crosstalk Channel Estimation - A method of far-end crosstalk (FEXT) channel estimation in a digital subscriber line (DSL) system, wherein the DSL system comprises a first subscriber line and a second subscriber line, the method comprising allocating a plurality of time slots, wherein the plurality of time slots comprises a first period and a second period, wherein the first period precedes the second period, and wherein each of the first and second periods comprises at least one time slot, transmitting at least one training symbol in the first period onto the second subscriber line in a downstream direction while no transmission is made on the first subscriber line, receiving at least one feedback symbol in the second period from the first subscriber line in an upstream direction, and estimating a level of downstream FEXT from the second subscriber line into the first subscriber line based on the at least one feedback symbol. | 01-30-2014 |
20140036654 | METHOD AND DEVICE FOR SECURED SHARING OF SIGNALS FOR CROSSTALK CANCELLATION - A method is described for reducing interferences in communications exchanged along a plurality of communication channels operated by a first operator, caused by one or more alien communication channels operated by a second operator. The method comprises the steps of: (i) providing the second operator with information that relates to interferences experienced at the plurality of communication channels operated by a first operator, due to traffic conveyed along alien communication channels operated by the second operator; (ii) modifying the original signals conveyed by the second operator along the alien communication channels; (iii) sending the modified signals to the first operator; and (iv) applying the modified signals by the first operator to reduce interferences in communications exchanged along the plurality of communication channels and operated by the first operator. | 02-06-2014 |
20140043954 | SYSTEMS AND METHODS FOR IMPLEMENTING ENERGY-EFFICIENT ETHERNET COMMUNICATIONS - Systems and methods for implementing an Energy-Efficient Ethernet (EEE) communication are provided. In some aspects, a method includes identifying an EEE signal configured to be communicated via a first set of wires. The method also includes processing the EEE signal such that the processed EEE signal is configured to be communicated via a second set of wires. The second set of wires including fewer wires than the first set of wires. The method also includes communicating the processed EEE signal via the second set of wires. | 02-13-2014 |
20140050075 | Method and System for Monitoring Activity of a Remote Link Partner to Trigger Training of Ethernet Channels to Support EEE Networks - It may be determined via monitoring whether a first link partner and/or a second link partner coupled via an Ethernet link has trained or refreshed circuitry and/or has updated at least one parameter. Based on the determination, a corresponding link partner may be trained, refreshed and/or updated. One or more of an echo canceller, a far-end crosstalk canceller and a near-end crosstalk canceller for one or more channels may be configured based on the training, refreshing and/or updating. One or more channels may be silent and/or one or more may be active. Link partners may communicate via one or more of in-band signaling, out-of-band signaling to determine which link partner may monitor and/or which may control or initiate operation. The controlling link partner may be assigned a master mode of operation. Training, refreshing and/or updating for the monitoring link partner may be based on a timer. | 02-20-2014 |
20140086038 | ISOLATOR DEVICE FOR PASSING THROUGH A SIGNAL - Isolator devices for a class A evacuation system are provided. The isolators each have specific address in the system. This allows the isolators to report individually with address information and status information, for example related to errors in the system and the device in particular. In an embodiment, a speaker can be connected to the device. This allows the speaker to be addressed individually so dedicated information like alarms and spoken messages can be sent to specific speakers. Dedicated isolators are available for announcing, powering the network and routing network traffic. Routers provide a possibility to create multiple loops, reducing wiring and increasing redundancy. By sending data in different branches by means of spread spectrum modulation, more data can be sent and effects of crosstalk between branches is highly reduced. | 03-27-2014 |
20140086039 | System And Method For Coordination Of Neighboring Networks On Wireline Communication Channels - Embodiments of system and method for coordination among neighboring networks for communications over shared physical medium are provided. In one aspect, a method comprises determining, by a first domain master of a first network domain, a first number of network nodes of the first network domain that interfere with data transmission on the physical medium by at least one network node of at least one other network domain, or a second number of network nodes of the at least one other network domain that interfere with data transmission on the physical medium by at least one network node of the first network domain. The method further comprises causing, by the first domain master, one or more network nodes of the first network domain to transmit data during one of a plurality of non-overlapping time slots of a MAC cycle. | 03-27-2014 |
20140092719 | RADIO TRANSCEIVER ON A CHIP - An entire radio transceiver can be compeltely integrated into one IC chip. In order to integrate the IF filters on the chip, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wise are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages. | 04-03-2014 |
20140140186 | CIRCUIT BOARD WITH LOW SIGNAL FAR END CROSSTALK - A circuit board includes at least four signal lines. The at least four signal lines are substantially parallel to each other and includes two first adjacent signal lines and two second adjacent signal lines adjacent to the first adjacent signal lines. A polarity of signals transmitted by the two first adjacent signal lines is opposite to a polarity of signals transmitted by two second adjacent signal lines. | 05-22-2014 |
20140140187 | METHOD, APPARATUS AND SYSTEM FOR SUPPORTING NON-VECTOR LINE - Embodiments of the present invention provide a method, an apparatus, and a system for supporting a non-vector line. The method includes: selecting n non-vector lines T | 05-22-2014 |
20140146657 | COORDINATING TRANSMISSIONS OF POWER LINE COMMUNICATION (PLC) DEVICES - A system for coordinating transmissions of power line communication (PLC) devices may include a processor and a memory. The processor may be configured to receive channel state information (CSI) from primary PLC devices. The primary PLC devices may be communicatively coupled to secondary PLC devices via collocated power lines, such as bundled power lines. Thus, the transmission of a primary PLC device over a power line to a secondary PLC device may be electromagnetically coupled onto the other power lines, thereby causing far-end crosstalk (FEXT) interference with respect to other secondary PLC devices. The processor may be configured to determine precoding information for compensating for the FEXT interference based at least on the received CSI. The processor may be configured to provide at least a portion of the precoding information to the primary PLC devices and to coordinate precoded transmissions of the primary PLC devices to mitigate the FEXT interference. | 05-29-2014 |
20140153377 | Method for Managing Data Transport Using Crosstalk Data - A method and device are provided for affecting data conveyance within a cable comprising a plurality of copper wire lines. The method comprises: providing information about crosstalk interference experienced by the copper wire lines; for each copper wire line experiencing crosstalk interference (interfered line), identifying which other copper wire lines induce crosstalk interference to that interfered line; partitioning the copper wire lines into interference groups, where each interference group comprises at least one copper wire line, wherein at least one of the interference groups comprises at least three copper wire lines, and wherein in case that a given interference group comprises more than two copper wire lines, then each of the copper wire lines belonging to that interference group is subjected to interference induced by another copper wire line that belongs to that interference group; and based on the partitioning step, changing operational settings of at least one copper wire line. | 06-05-2014 |
20140153378 | WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION SYSTEM, AND CHANNEL SELECTION METHOD - An electric field intensity measuring circuit measures the electric field intensity of each of multiple communication channels available for data communication. A channel determiner compares electric field intensities measured by an electric field intensity measuring circuit with multiple different thresholds including a first threshold as the carrier sense threshold and a second threshold that is the detrimental interference level the interference of which causes the reception sensitivity to deteriorate, counts the numbers of times that the electric field intensity exceeds the thresholds on each communication channel, and selects a communication channel for use based on the counted numbers of times that the thresholds have been exceeded on the communication channels. | 06-05-2014 |
20140219074 | Adjusted Transmission in XDSL - Method and transmitting node for adjusting transmission over xDSL lines connected to the transmitting node. The method involves transmitting ( | 08-07-2014 |
20140247707 | SIGNAL RECEPTION MULTI-TUNER SYSTEM AND CORRESPONDING METHOD - The invention relates to a Multi-tuner reception system comprising at least a first tuner and a second tuner, the first tuner being adapted to translate a frequency of a first received signal into a first translated frequency, the first tuner comprising a first local oscillator operating at a first local oscillator frequency, the second tuner being adapted to translate a frequency of a second received signal into a second translated frequency, the second tuner comprising a second local oscillator operating at a second local oscillator frequency, wherein the second local oscillator frequency is equal to the sum of the first local oscillator frequency and a continually time variable offset frequency. | 09-04-2014 |
20140269245 | METHOD AND SYSTEM FOR INITIATING BI-DIRECTIONAL COMMUNICATION IN A TIME-DIVISION DUPLEX COMMUNICATION SYSTEM - The present invention relates to a method and a system for initiating bi-directional communication in a time-division duplex (TDD) communication system between a customer premises equipment (CPE) modem, such as a DSL modem, and an operator modem, such as a DSLAM. The invention is characterized in that the transmission of the CPE modem is aligned with the time-division duplex timing structure present in received crosstalk noise when transmitting initiation signals, so-called handshake tones. | 09-18-2014 |
20140269246 | INTERFERENCE CANCELLATION - A method to enhance coverage and/or throughput in a heterogeneous wireless network includes detecting interference between a neighboring cell and a serving cell. The method also includes cancelling the interference using an adaptive technique based on whether the interference has colliding Common Reference Signal (CRS) tones or whether the interference has colliding Dedicated Reference Signal (DRS) tones. | 09-18-2014 |
20140269247 | METHOD AND APPARATUS TO COMPENSATE FOR NONLINEAR ECHO IN AN OUTPUT OF A CURRENT SOURCE - A compensator generating a compensation signal to compensate for nonlinear echo in an output of a current source. The nonlinear echo is a result of transitioning the current source between an ON state and an OFF state. The compensator includes driving, weighting, function, and compensating circuits. The driving circuit receives a first signal that is based on the output of the current source. The weighting circuit is configured to generate a second signal based on weighted versions of the first signal. The function circuit, based on the second signal, (i) updates each of multiple functions, and (ii) selects a first function. The driving circuit generates a driving signal based on the first function selected by the function circuit. The compensating circuit generates the compensation signal based on the driving signal to compensate for the nonlinear echo provided by the output of the current source. | 09-18-2014 |
20140321257 | CDMA-BASED CROSSTALK CANCELLATION FOR ON-CHIP GLOBAL HIGH-SPEED LINKS - Synchronous CDMA/spread spectrum methods, devices, and systems are used to suppress crosstalk in clock-forwarded on-chip interconnects. Transmitting a spread spectrum signal across on-chip interconnects for recovery at the terminus permit integrated chip designers to overcome the effects of capacitive cross-talk between adjacent data bus lines. The methods, devices, and systems provided herein improve cross-talk immunity between adjacent high speed signal lines by applying synchronous CDMA spread spectrum techniques to some or all of the high speed signal lines. Other methods, devices, and systems provided herein apply synchronous CDMA spread spectrum techniques to the concept of sending phantom signals to reduce the number of signal lines used to carry data. | 10-30-2014 |
20140328154 | Method for Crosstalk and Power Optimization in Silicon Photonic Based Switch Matrices - Crosstalk can be suppressed in photonic switching fabrics by activating unused photonic elements in a manner that manipulates the inactive connections and inhibits the propagation of cross-talk over the switching fabric. For example, unused photonic elements can be set to a cross or bar configuration to block first and second order crosstalk from propagating to the output ports, thereby reducing noise in the output signals. All of the unused elements can be activated in order to maximize crosstalk suppression. Alternatively, fewer than all of the unused elements may be activated to achieve a balance between crosstalk suppression and power conservation. Photonic switch architectures can be configured to use pre-determined cross-talk suppression maps (e.g., patterns of activated unused cells) for the various switching configurations, which may be computed using a recursive algorithm. | 11-06-2014 |
20140334283 | Dynamic Rate Adaptation Methods In A Vectored G.Fast System - The present disclosure provides mechanisms, systems, methods, techniques and devices for dynamic rate adaptation in a vectored G.fast system. More specifically, a flexible framework that incorporates with residual crosstalk noise is provided. | 11-13-2014 |
20140355407 | METHODS AND SYSTEMS FOR EFFICIENT MULTI-WIRE COMMUNICATIONS AND CROSSTALK CANCELLATION - Methods and systems are disclosed for efficient cancellation of crosstalk between signals transmitted over multiple signal paths. Symmetry is induced on the signals transmitted over the signal paths such that the crosstalk matrix becomes a matrix with structure. Such structured matrix may be a circulant matrix of which the inverse may be applied efficiently to transmitted symbols or received symbols. Application of such inverse may comprise the fast Fourier transform. Applications of the methods and systems disclosed include chip-to-chip communications, on-chip communications, communication over cables and storage of information. | 12-04-2014 |
20140362677 | CABLE-LEVEL CROSSTALK REDUCTION - A device for managing signal transport, on a cable level, in a communication system, and a method for using same, are provided herein. The device is connectable between one or more access multiplexers (e.g., Very-high-speed Digital Subscriber Loop Access Multiplexer (VDSLAM) or a switch) and a cable in said communication system. The device includes: a plurality of access multiplexer-side transceivers connectable to access multiplexer-related physical medium, associated with said one or more access multiplexers; a plurality of customer-side transceivers connectable to respective customer-related wire pairs of said cable; and a processor connected to said access multiplexer-side transceivers and said customer-side transceivers, said processor comprising means for reducing crosstalk among said customer-related wire pairs. In some embodiments, vectoring is used for the crosstalk reduction, thus implementing a so-called cable level vectoring (CLV). | 12-11-2014 |
20150009793 | APPARATUS AND METHODS FOR CROSSTALK COMPENSATION - It is described an apparatus for determining a PLC-to-DSL crosstalk estimate. The apparatus comprises a PLC-to-DSL channel estimator which is arranged to receive an input signal, comprising a DSL contribution and a PLC-to-DSL crosstalk contribution, and which is arranged to determine channel state information of a PLC-to-DSL channel responsible for the PLC-to-DSL crosstalk contribution in the input signal. The apparatus further comprises a crosstalk processor which is arranged to determine the PLC-to-DSL crosstalk estimate based on the channel state information and a reconstructed PLC transmit signal. | 01-08-2015 |
20150009794 | METHOD AND APPARATUS FOR INFERRING USER EQUIPMENT INTERFERENCE SUPPRESSION CAPABILITY FROM MEASUREMENTS REPORT - UE that are able to cancel interference from CRS, a PDSCH, a PDCCH, or a PCFICH may do so without explicitly signaling the capability to the serving eNB. The serving eNB may transmit to the UE a plurality of cell identifiers to indicate from which cells interference should be canceled. The UE receives CRS, PDSCH, PDCCH, or PCFICH from the serving eNB and cancels CRS, PDSCH, PDCCH, or PCFICH interference, respectively from the signal received from the eNB. The UE cancels the interference from the cells that correspond to the cell identifiers. The UE may then transmit a report to the eNB with a quality measurement without the interference. | 01-08-2015 |
20150016239 | METHOD AND APPARATUS FOR SETTING REFERENCE SIGNAL - Disclosed are a method and an apparatus for setting a reference signal. A wireless apparatus receives a primary synchronization signal (PSS) transmitted by a first orthogonal frequency division multiplexing (OFDM) symbol and a secondary synchronization signal (SSS) from a second OFDM symbol, and can search information for setting a reference signal on the basis of symbol numbers of the first OFDM symbol and the second OFDM symbol. Inter-cell interference can be reduced by means of a variety of methods for setting a reference signal. | 01-15-2015 |
20150023145 | METHOD FOR TRANSMITTING AND RECEIVING SIGNAL ON BASIS OF DYNAMIC CHANGE IN WIRELESS RESOURCE IN WIRELESS COMMUNICATION SYSTEM TO WHICH CARRIER AGGREGATION SCHEME IS APPLIED, AND DEVICE THEREFORE - A method for transmitting and receiving a signal by a terminal a wireless communication system is disclosed in the present invention. More particularly, the method comprises the steps of: receiving an indicator for changing the usage of a specific subframe corresponding to a sub-component carrier from a network; determining whether near-end crosstalk between the sub-component carrier and another component carrier occurs if the usage of the subframe is changed according to the indicator; and transmitting and receiving a signal to and from the network through the sub-component carrier according to the changed usage if it is determined that the near-end crosstalk does not occur. | 01-22-2015 |
20150071047 | DATA TRANSMISSION CIRCUIT AND DATA TRANSMISSION / RECEPTION SYSTEM - A data transmission/reception system includes a data transmission circuit and a data reception circuit. The data transmission circuit includes a pattern detection unit configured to detect a pattern of data to be loaded on inner lines among a plurality of transmission lines and generate an inversion signal, and a transmission unit configured to transmit data to the plurality of transmission lines and the inversion signal to an inversion line, and invert some of the data to be loaded on the inner lines in response to the inversion signal. The data reception circuit is configured to invert the data inverted by the transmission unit among the data transferred to the plurality of transmission lines, in response to the inversion signal. | 03-12-2015 |
20150085634 | CROSS-TALK CANCELLATION IN A MULTIBAND TRANSCEIVER - Embodiments relate to a multiband transceiver apparatus ( | 03-26-2015 |
20150138943 | Digital Subscriber Line Access Multiplexer for Sending Communication Signals to Customer Devices - Methods and systems are provided for sending and/or receiving communication information by a digital subscriber line access multiplexer to customer devices at one or more customer premises, via customer lines. In particular, the digital subscriber line access multiplexer may be configured to send a communication signal, for a particular customer device, concurrently via more than one customer line. The digital subscriber line access multiplexer may enhance a communication signal, received from a particular customer device, via a particular customer line, such as using a second communication signal received concurrently from the particular customer device via a second customer line. | 05-21-2015 |
20150295621 | Method and Device for Line Initialization - The present invention provides a method and a device for line initialization. In the method, first, a first precoding matrix needed by a first part of subcarriers is acquired in a downstream direction, and then multiple data signals of all data signals that need to be sent in an initialization process are sent by using only the first part of subcarriers; afterward, a second precoding matrix needed by at least a second part of subcarriers of all available subcarriers is acquired, and remaining data signals of all the data signals exclusive of the multiple data signals are sent by using the at least second part of subcarriers to complete line initialization. By using the foregoing manner, the present invention can cancel crosstalk between lines while completing line initialization, and does not easily cause transmit power to exceed a limit. | 10-15-2015 |
20150318891 | COMMUNICATION CHANNEL IDENTIFICATION IN A POWER LINE COMMUNICATION NETWORK - In one embodiment, a device in a network receives a message from a neighboring device that identifies the electrical phase on which the message was sent. Crosstalk is identified between the device and the neighboring device by determining that the message was received on a different electrical phase than the phase on which the message was sent. One or more distinct communication channels between the device and the neighboring device are identified based on the identified crosstalk with each communication channel including or more electrical phases. | 11-05-2015 |
20150326278 | GAIN ADAPTATION FOR DOWNSTREAM VECTORING SYSTEMS - In accordance with an embodiment, the method includes detecting an update event whereupon a precoder needs to be updated, sending signal adjustment information to a receiver remotely coupled to a subscriber line out of the plurality of subscriber lines indicative of a signal compensation factor to be applied to a receive communication signal to compensate for a channel bias caused by the scheduled precoder update, and time-coordinating the precoder update with the enforcement of the signal compensation factor at the receiver. | 11-12-2015 |
20150334022 | VIRTUAL SUB-NET BASED ROUTING - A method and system to route connections of sub-networks in a design block of an integrated circuit and a computer program product are described. The system includes a memory device to store instructions to route the connections of the sub-networks, and a processor to execute the instructions to determine a baseline route for each of the connections of each of the sub-networks, identify noise critical sub-networks in the integrated circuit design based on congestion, set a mean threshold length (MTL), segment the connections of the noise critical sub-networks based on the MTL, and re-route the baseline route based on segmenting. The MTL indicates a maximum length of each segment of each connection, each segment includes a different wirecode than an adjacent segment, and the wirecode defines a width, metal layer, and spacing for the segment. | 11-19-2015 |
20150341081 | METHOD AND APPARATUS FOR UPDATING FEXT COEFFICIENTS FOR G.FAST VECTORING WITH DISCONTINUOUS OPERATION - In general, the present invention is related to methods and apparatuses for performing an efficient update of Far-End Cross Talk (FEXT) coefficients for use with Discontinuous Operation (DO) in G.fast systems. In embodiments, to maintain separate FEXT coefficient matrices for both the Regular Operation (RO) group and the smaller DO group, the updates to the DO coefficient matrix are performed independently from the updates to the RO coefficient matrix. In these and other embodiments, the updates are performed using LMS updates and known data symbols, and with the same frequency as the LMS updates to the RO coefficient matrix. | 11-26-2015 |
20150341180 | METHOD AND APPARATUS FOR MANAGING JOINING EVENTS FOR G.FAST VECTORING WITH DISCONTINUOUS OPERATION - In general, the present invention provides an efficient usage of Far End Crosstalk (FEXT) coefficient memory in a G.fast vectoring system. According to certain aspects, embodiments of the invention provide a simple scheme for efficient management of the Discontinuous (DO) and Regular Operation (RO) FEXT coefficient memories to handle the complexity of lines joining/leaving the system in both regular and DO groups. In embodiments, by disabling the power-efficient, Discontinuous Operation, a G.fast system according to the invention first frees up the DO coefficient memory. Next, the system uses this memory as the staging area to manage joining/leaving events. Finally the system re-enables to the power-efficient Discontinuous Operation and re-populates the DO coefficient memory. | 11-26-2015 |
20150365131 | Crosstalk Management For OFDM Communication Systems In Power Efficient Transmission Mode - In the present disclosure, several techniques are proposed to estimate the worst-case crosstalk noise and use it for bit-loading and SRA calculations so that fluctuating crosstalk when PET mode is enabled does not lead to system instability. One of the proposed techniques involves strategically placing some marker tones in the transmitters of the affecting lines. The noise floor may be inferred by interpolating the noise observed on these marker tones (tones that are always-on) and applying to the entire frequency band on the victim line. Another proposed technique involves periodically transmitting a set of marker symbols (fully loaded OFDM symbols), so that a victim channel can estimate the SNRs in a worst case crosstalk scenario. | 12-17-2015 |
20150381234 | METHODS AND SYSTEMS FOR EFFICIENT MULTI-WIRE COMMUNICATIONS AND CROSSTALK CANCELLATION - Methods and systems are disclosed for efficient cancellation of crosstalk between signals transmitted over multiple signal paths. Symmetry is induced on the signals transmitted over the signal paths such that the crosstalk matrix becomes a matrix with structure. Such structured matrix may be a circulant matrix of which the inverse may be applied efficiently to transmitted symbols or received symbols. Application of such inverse may comprise the fast Fourier transform. Applications of the methods and systems disclosed include chip-to-chip communications, on-chip communications, communication over cables and storage of information. | 12-31-2015 |
20150381259 | Wireless Communications Systems and Methods - Methods and systems that enhance interference cancellation in communication channels are described. Specialized time domain training sequences and simple cross correlation are used to obtain a channel estimate for use in stacked carrier beamforming and OFDM based spatial beamforming. In certain embodiments, a time domain preamble sequence is provided as an alternative to the conventional frequency domain preamble sequence. The use of a time domain preamble can increase channel estimation performance, facilitating cancellation of co-channel interference. Embodiments include generating a training sequence preamble in the time domain, computing a frequency domain response of the channel using an estimate of its time domain impulse response, and using the frequency domain response of the channel to calculate channel estimation from a cross correlation of data received from the channel against the training sequence. | 12-31-2015 |
20160013883 | POWER CONTROL METHOD, APPARATUS, AND SYSTEM | 01-14-2016 |
20160036489 | Signal receiving device for Ethernet and control method thereof - This invention discloses a signal receiving device for Ethernet and a control method thereof. The signal receiving device includes a gain control circuit, an alien near-end crosstalk canceller, a noise canceller, and a DFE. The gain control circuit adjusts an input signal of the signal receiving device according to a setting parameter. The alien near-end crosstalk canceller cancels an alien near-end crosstalk interference. The noise canceller uses a first filter to cancel noises. The DFE uses a second filter to cancel an inter-symbol interference of the input signal. The method includes steps of: temporarily stopping the gain control circuit from updating the setting parameter before a seed collision occurs, and temporarily stopping one of the noise canceller and the decision feedback canceller from updating the first filter coefficient of the first filter or the second filter coefficient of the second filter temporarily during the seed collision. | 02-04-2016 |
20160049990 | POWER CONTROL METHOD, DEVICE, AND SYSTEM - Embodiments of the present invention provide a power control method, device, and system, and relate to the field of communications technologies. The method is applied to a vectoring system, where the vectoring system includes multiple lines, each line includes multiple subcarriers, and for each subcarrier, a crosstalk channel is formed between the multiple lines, and the method includes: obtaining a closed subcarrier set of the multiple lines according to line crosstalk channel information corresponding to each subcarrier of the multiple subcarriers, where the closed subcarrier set includes a subcarrier set required to be closed on the multiple lines; and sending the closed subcarrier set of the multiple lines to a transceiver, and closing, by the transceiver, a transmit signal on a subcarrier required to be closed on each line. | 02-18-2016 |
20160072600 | Method And System For Interference Avoidance In A Multi-Protocol Communication System - Methods and systems for interference avoidance in a multi-protocol communication system may comprise receiving signals in a first communications protocol in a first frequency range and preventing interference signals from being generated in said first frequency range by configuring channel usage in a second communications protocol in a second frequency range based on said received signals. The configuring channel usage may include avoiding communicating in taboo channels and the received signals in said first communications protocol and signals in said configured channels in said second communications protocol may be communicated over one or more coaxial cables based on the configured channel usage. The taboo channels may be selected based on said received signals such that interference signals from said second frequency range do not occur in said first frequency range. The first frequency range comprises a cable or satellite television frequency range, or data over cable service interface standard (DOCSIS). | 03-10-2016 |
20160105214 | CROSSTALK REDUCTION METHOD AND REPEATER - A crosstalk reduction method includes providing a signal transmission unit including first to eighth main transmission paths, the first and second paths, the third and sixth paths, the fourth and fifth paths and the seventh and eighth paths being respectively paired to transmit differential signals, providing a first coupling transmission path in the signal transmission unit, the first coupling transmission path being adapted to electrically couple the third main transmission path to the fifth and seventh main transmission paths that are located adjacent to the sixth main path, and providing a second coupling transmission path in the signal transmission unit, the second coupling transmission path being adapted to electrically couple the sixth main transmission path to the second and fourth main transmission path that are located adjacent to the third main transmission path. | 04-14-2016 |
20160105215 | Crosstalk Cancellation Over Multiple Mediums - A method of cancelling crosstalk including receiving, by a vector processor, a first signal from a first medium and a second signal from a second medium, wherein the first medium is different from the second medium, determining, using the vector processor, vectoring coefficients based on the first signal and the second signal received, cancelling, using the vector processor, the crosstalk from at least one of the first medium to the second medium and the second medium to the first medium using the vectoring coefficients determined, and transmitting or demodulating corrected signals following the cancellation of the crosstalk. | 04-14-2016 |
20160119024 | APPARATUS AND METHOD FOR DIGITALLY CANCELLING CROSSTALK - Described is an apparatus which comprises: a first buffer to receive a first signal from a first transmission media; a second buffer to receive a second signal from a second transmission media separate from the first transmission media; a first summing node coupled to the first buffer, the first summing node to receive output of the first buffer; and a first digital adjustment circuit which is operable to drive a first adjustment signal to the first summing node when a transition edge of the second signal is detected. | 04-28-2016 |
20160119025 | Methods, devices and systems of supporting discontinuous operation in communication systems using vectoring - Methods, devices and systems of supporting discontinuous operation in communication systems using vectoring Methods, devices and techniques are disclosed where vectoring is adapted to lines becoming inactive and active, for example in a discontinued operation. In some embodiments, the vectoring is modified based on already present coefficients. | 04-28-2016 |
20160119026 | Communication Coexistence in Overlap Spectrum - Communication in a first spectrum and via a first transmission line of first data is according to a time-division duplexing scheme such as G.fast. Communication in a second spectrum and via a second transmission line of second data is according to a frequency-division duplexing scheme such as VDSL2. The first and second spectra both comprise an overlap spectrum. The first transmission line experiences first crosstalk from the second transmission line and the second transmission line experiences second crosstalk from the first transmission line. | 04-28-2016 |
20160119107 | Special operations channel in vectored systems - Methods and devices are provided wherein a signal sent on a special operation channel is modified by an identification of a line. | 04-28-2016 |
20160164590 | METHOD FOR TRANSMITTING REFERENCE SIGNALS IN A DOWNLINK MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for transmitting a reference signal for channel measurement (CSI-RS) to a user equipment; a base station therefore; a method for receiving a CSI-RS; and the user equipment therefore are discussed. The method for transmitting a CSI-RS according to one embodiment includes transmitting CSI-RS pattern information for indicating a pattern of time-frequency resource to be nulled, hereinafter referred to as null CSI-RS pattern, and CSI-RS subframe information for indicating in which subframe the null CSI-RS pattern occurs; and nulling a time-frequency resource corresponding to the null CSI-RS pattern in a subframe corresponding to the CSI-RS subframe information, hereinafter referred to as null CSI-RS subframe, based on the CSI-RS pattern information and the CSI-RS subframe information. The CSI-RS subframe information includes information indicating a periodic interval with which the null CSI-RS subframe occurs. The periodic interval corresponds to a plurality of subframes. | 06-09-2016 |
20160173215 | RADIO FREQUENCY TRANSCEIVER WITH LOCAL OSCILLATOR CONTROL FOR MULTI-CARRIER APPLICATIONS | 06-16-2016 |
20160182122 | METHODS AND SYSTEMS FOR REDUCING CROSSTALK FOR SETS OF LINES | 06-23-2016 |
20160182193 | BASE STATION APPARATUS, TERMINAL APPARATUS, AND INTEGRATED CIRCUIT | 06-23-2016 |
20160191117 | RANDOMIZATION OF CROSSTALK PROBING SIGNALS - In accordance with an embodiment, the vectoring controller is configured to iterate through successive crosstalk acquisition cycles and, within respective ones of the crosstalk acquisition cycles, to configure sequences of crosstalk probing symbols for transmission over the respective communication lines, to receive sequences of error samples as successively measured by respective receivers coupled to the respective communication lines while the sequences of crosstalk probing symbols are being transmitted, and to determine crosstalk estimates between the respective communication lines based on the sequences of error samples. The vectoring controller is further configured to randomize the successive sequences of crosstalk probing symbols used during the successive crosstalk acquisition cycles, and to iteratively configure the vectoring processor based on the successive crosstalk estimates. | 06-30-2016 |
20160197646 | Deactivation Method and System in Crosstalk Scenario | 07-07-2016 |
20160198361 | WLAN AP-ASSISTED MULTI-WAY COEXISTENCE | 07-07-2016 |
20160381696 | METHOD OF UTILIZING ECHO CANCELLATION FOR ENHANCING WIDE-BANDWIDTH OPPORTUNITY FOR WI-FI - Techniques for presenting communication by two or more stations in a WLAN environment are provided. Specifically, methods are presented, that when taken alone or together, provide a device or group of devices with an efficient way for bandwidth adaptation using echo cancellation. | 12-29-2016 |
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20180026774 | METHOD FOR TRANSMITTING AND RECEIVING SIGNAL ON BASIS OF DYNAMIC CHANGE IN WIRELESS RESOURCE IN WIRELESS COMMUNICATION SYSTEM TO WHICH CARRIER AGGREGATION SCHEME IS APPLIED, AND DEVICE THEREFORE | 01-25-2018 |