Abstract: The present invention concerns a method and device for cancelling interference between a signal carried by a carrier current line of a system distributing digital services at the home of a subscriber and a signal carried by a telephone line of said system that is situated close to the carrier current line. The method is characterised in that it consists of obtaining the signal carried by the carrier current line, filtering it in order to obtain an estimate of the signal that disturbs the signal carried by the telephone line and subtracting this estimate from the signal carried by the telephone line.

Abstract: A multiple input, multiple output (MIMO) communications unit includes a multiplicity of analog front ends and a MIMO processor. Each analog front end is connectable to a different two of the wires in a subscriber premises and each handles data of one channel. The MIMO processor processes together the data of the channels. In one embodiment, the wires are the power line wires in a subscriber premises, including the phase, neutral and ground power line wires. In another embodiment, the wires are pairs of telephony wires.

Abstract: In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses.

Abstract: A method for pairing a first power line communication device with a second power line communication device is disclosed, the method includes the first device triggering a pairing initiating state responsive to sensing a connection of a data cable with the second device; entering an appropriate pairing initiation state, the pairing initiation state being either an add device state or a join device state; and performing pairing with the second device.

Abstract: A cable modem device may include a plurality of cable modem termination system demodulators, a switching element and a plurality of cable termination system modem ports. The cable modem may receive signals from one of a plurality of downstream cable modems at one of the plurality of cable modem termination system ports and dynamically assign one of the plurality of cable modem termination system demodulators to one of the plurality of cable modem termination system ports. The signals received from the one of the plurality of downstream cable modems may be demodulated by the assigned one of the plurality of cable modem termination system demodulators. The assigned one of the plurality of cable modem termination system demodulators may be communicatively coupled to one of the plurality of cable modem termination system ports by the switching element.

Abstract: A system and method for utilizing multiple configurable lanes for clock and data transfer in source synchronous systems that may utilize a clock signal from another source for interpreting data received from the source. In an embodiment, a system may include a transmitter configured to transmit at least one clock signal and at least one data signal to a receiver device. The receiver device may have at least one clock lane and at least one data lane for receiving signals from the transmitter device. The clock lane(s) and data lane(s) can be arranged in any order as per requirement of system design. In the receiver, after manufacture, each data lane may be configured to be clocked by any clock lane.

Abstract: A termination circuit for a HDMI transmitter includes a bias unit and a termination resistor unit connected in parallel between a positive transmission pin and a negative transmission pin. The bias unit generates a bias voltage by selecting the higher voltage among a first voltage received through the positive transmission pin and a second voltage received through the negative transmission pin. The termination resistor unit is formed on a well region biased by the bias voltage, and conditionally provides a termination resistance between the positive transmission pin and the negative transmission pin in response to a termination resistor control signal. The termination circuit conditionally provides a termination resistance without a leakage current. The termination resistance may be varied by using an n-bit control code.

Abstract: A method for simultaneous transmission of at least two high-frequency transmission signals via a common high-frequency line includes providing at least two input signals at respective inlet ports. The input signals are signals of a same carrier frequency. From the input signals, respective transmission signals are provided with different transmission frequencies from each other and from the carrier frequency by mixing the input signals using one frequency mixer each. The frequency mixers are supplied with respective mixer oscillator signals. The transmission signals are transmitted via the common high-frequency line. The mixer oscillator signals are provided from a same oscillator signal.

Abstract: Embodiments provide access to a memory over a high speed serial link at slower speeds than the high speed serial links regular operation. An embodiment may comprise a memory apparatus with a differential receiver coupled to a protocol recognition circuit, a low speed receiving circuit that has a first receiver coupled with a first input of the differential receiver and a second receiver coupled with a second input of the differential receiver, wherein the low speed receiving circuit is coupled with the protocol recognition circuit, allowing the first and second receivers to access the protocol recognition block at a different frequency than the differential receiver.

Abstract: A vectored DSL system reduces or eliminates correlated alien interference in active DSL lines in the vectored system by collecting pseudo signals from inactive lines that do not carry upstream DSL transmissions and/or from common-mode voltage signals from active lines. The collected pseudo signals contain in-domain interference, such as FEXT interference from the active DSL lines in the vectored system, and correlated alien interference. After removing the in-domain interference from the pseudo signals, the remaining alien interference data can be used to generate FEXT cancellation coefficients or the like that are used in DSL vectoring to remove the correlated alien interference from upstream DSL user signals from the active DSL lines. The generated FEXT cancellation coefficients are used in a manner analogous to in-domain FEXT data collected from the active lines during training, tracking, etc.

Abstract: A signal transmission circuit includes a driver circuit that includes complementary inverters, each of the complementary inverters including a plurality of transistor switches, each of the plurality of transistor switches including a pair of transistors, one of the pair of transistors operating in a saturation region and another of the pair of transistors operating in a triode region to cause a certain impedance, and that drives each of the plurality of transistor switches in accordance with complementary signals so as to output complementary voltages to a transmission line; and first voltage sources that supply operating voltages to the driver circuit so as to adjust amplitudes of the complementary voltages output from the driver circuit to the transmission line.

Abstract: Systems and methods for encoding/decoding a data word using an 8b/9b encoding scheme that eliminates two-aggressor crosstalk are disclosed. The 8b/9b encoding scheme enables a data word to be encoded using code words. Each of the valid code words does not include any three consecutive bits having a logic level of logic-high (i.e., ‘1’), and represent transition vectors for consecutive symbols transmitted over the high speed parallel bus. An encoder and corresponding decoder are disclosed for implementing the 8b/9b encoding scheme. In one embodiment, the encoder/decoder implements a modified Fibonacci sequence algorithm. In another embodiment, the encoder/decoder implements a look-up table.

Abstract: Embodiments of the present invention relate to the field of communication technologies, and in particular, to a method, an apparatus, and a system for processing signals based on a twisted pair. The method for processing signals based on a twisted pair includes: determining a signal processing manner; performing, according to the signal processing manner, digital processing on signals of the extended channels that are to be sent to convert the signals of the extended channels into common mode signals of each twisted pair; and sending the converted common mode signals of the each twisted pair to corresponding twisted pairs for transmission.

Abstract: Exemplary embodiments of the present invention relate to a power line communication (PLC) system. For example, the PLC system may include a PLC server configured to provide electrical power and electronic communications through a PLC bus to a number of electronic devices, such as an instrument cluster, infotainment interface, rear-seat entertainment console, aftermarket accessories, and the like. The PLC system may also include a power system that may be coupled to an electrical grid for charging a battery associated with one or more of the electronic devices. The power system may be communicatively coupled to the PLC bus, enabling the devices coupled to the PLC bus to communicate with a service provider through the electrical grid. The communications between the devices coupled to the PLC bus and remote devices coupled through the electrical grid may be conducted using a common communication protocol.

Abstract: A balun structure is disclosed having positive and negative going signal paths coupled to a ninety degree hybrid. The positive signal path has a circuit trace and a phase shaper structure that provides three hundred and sixty degrees of phase shift at Port 1 of the hybrid. The negative going signal path has a circuit trace and a second order phase shaper that provides four hundred and fifty degrees of phase shift at Port 2 of the hybrid. Port 1 is coupled to Port 3 of the hybrid and functions as an output port. The first order phase shaper and the second order phase shaper compensate for the signal loss caused by a signal cable coupled to the output port and provide a frequency band from DC to at least 15 GHz and a transient response having less than ten percent pre-shoot.

Abstract: One embodiment of the present invention sets forth a mechanism for transmitting and receiving ground-referenced single-ended signals. A transmitter combines a direct current (DC) to DC converter including a flying capacitor with a 2:1 clocked multiplexer to drive a single-ended signaling line. The transmitter drives a pair of voltages that are symmetric about the ground power supply level. Signaling currents are returned to the ground plane to minimize the generation of noise that is a source of crosstalk between different signaling lines. Noise introduced through the power supply is correlated with the switching rate of the data and may be reduced using an equalizer circuit.

Abstract: Systems and methods for power and bidirectional data transmission using a plurality of wires. A multiphase digital signal is downlinked from a main unit to a remote unit over the plurality of wires and is converted to a DC power signal used to power the remote unit. Uplink data is sent from the remote to the main over one selected wire during a predetermined time period for an uplink transmission by amplitude modulating the received digital signal at the remote. During an uplink, the output impedance of the line driver in the main unit connected to the wire selected for the uplink is increased to allow for the uplink amplitude modulation. The modulated signal is maintained within the noise margins of the digital circuits in the main and remote units.

Abstract: Embodiments of methods and systems for supporting coexistence of multiple technologies in a Power Line Communication (PLC) network are disclosed. A long coexistence preamble sequence may be transmitted by a device that has been forced to back off the PLC channel multiple times. The long coexistence sequence provides a way for the device to request channel access from devices on the channel using other technology. The device may transmit a data packet after transmitting the long coexistence preamble sequence. A network duty cycle time may also be defined as a maximum allowed duration for nodes of the same network to access the channel. When the network duty cycle time occurs, all nodes will back off the channel for a duty cycle extended inter frame space before transmitting again. The long coexistence preamble sequence and the network duty cycle time may be used together.

Abstract: 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.

Abstract: An apparatus and system for controlling traffic on an on-chip network. Embodiments of the apparatus comprise single-ended transmission circuitry and single-ended receiving circuitry on a first chip for coupling with a second chip, the transmission circuitry having impedance matching and lacking equalization, the receiving circuitry lacking equalization, the transmission circuitry and the receiving circuitry having statically configurable features and organized in clusters, wherein the clusters have the same physical layer circuitry design for different configurations of the configurable features, the configurable features including half-duplex mode and full-duplex mode, wherein the first chip and the second chip are on the same package, and wherein a plurality of conductive lines for coupling the first chip with the second chip are matched.

Abstract: Methods, systems, and devices are described for providing a communication system for handling pulse information. Embodiments of the invention provide a pulse shaping unit operable to avoid saturation of the pulse transformer, while being easily incorporated into IC processes. Some embodiments of the pulse shaping unit provide a two-to-three level driver unit for converting a two-level input voltage signal to a three-level driver signal for driving a pulse transformer. Other embodiments of the pulse shaping unit provide components configured to differentially drive a pulse transformer, effectively converting a two-level input voltage signal to a three-level driver signal.

Abstract: Methods of generating coding errors on a communication line include changing a phase and/or an amplitude of a communication signal on the communication line. An apparatus for generating coding errors on a communication line including first and second parallel conductors includes a modulator configured to change a phase and/or an amplitude of a communication signal on the communication line in response to a control signal, and an oscillator configured to generate the control signal.

Abstract: A non-liner device (NLD) between powerline communication (PLC) devices can introduce significant distortion into the channel being utilized by the PLC devices. This distortion can create errors and corrupt data transmitted by the PLC devices. When trying to mitigate the effects of the distortion introduced by NLDs, PLC devices conform their mitigating actions to effectively satisfy a limit(s) set by a regulation and/or a standard. A PLC device implemented in accordance with this disclosure can mitigate the distortion effects with deference to regulatory/standard limits without knowledge of what types of NLDs and how many NLDs are coupled to the power line. A PLC device can use different techniques to infer the presence of an NLD in a PLC network. A PLC device can infer the presence of the NLD using a passive technique or one or more active techniques.

Abstract: A communication device includes a data communication unit that sends a communication signal, which is obtained by at least modulating transmission data, to a power line; a zero-crossing-point detector that detects a zero crossing point of an alternating voltage applied from the power line; a transmission unit that sends a coexistence signal to the power line in a coexistence region that starts at a time based on the zero crossing point, the coexistence signal having information for allowing systems to be present on the power line; a receiving unit that detects the coexistence signal from the power line in the coexistence region; a setting unit that sets a detection period for performing a detection operation for detecting a broadcast wave in accordance with the coexistence signal; and a broadcast-wave detector that detects a broadcast wave by performing frequency analysis on a signal on the power line in the detection period.

Abstract: A transmitting/receiving device includes a transmitting/receiving unit and a signal processing unit. The transmitting/receiving unit is connected to a transmission side or a reception side via a differential signal line including a pair of signal lines, receives a signal using one of the pair of signal lines when being connected to the transmission side, and transmits a signal using the other of the pair of signal lines when being connected to the reception side. The signal processing unit processes a signal that is transmitted or received by the transmitting/receiving unit.

Abstract: A digital subscriber line arrangement includes a downstream modem, an upstream modem and a copper pair connection between the modems. Each modem includes electrical length estimation function code means which causes the respective modem to measure the attenuation of signals transmitted by the other modem at a plurality of different frequencies, and to combine these measurements, or functions thereof, together to form a combined attenuation measure and to use this combined measure to form an electrical length estimation, KL0bis. The downstream modem is operable to transmit its electrical length estimation to the upstream modem, and the upstream modem is operable to generate a definitive electrical length estimation in dependence upon both the received estimation from the downstream modem and the estimation made by the upstream modem. Having generated a definitive electrical length estimation, the upstream modem is operable to transmit this to the downstream modem.

Abstract: A method for transmitting a signal from a transmitter over a channel to a receiver on a Power Line Network, wherein said signal is OFDM-modulated on a set of sub-carriers, is proposed, wherein an OFDM tonemap and an eigenbeamforming encoding matrix are determined based on a channel estimation for each sub-carrier, a tonemap feedback signal and an eigenbeamforming feedback signal are generated, which are descriptive of said OFDM tonemap and said eigenbeamforming encoding matrix, respectively, and transmitted to the transmitter. A corresponding receiver, a transmitter, a power line communication and a power line communication system are described as well.

Abstract: The invention is directed to a digital isolation system including an isolation barrier, a transmitter circuit receiving an input signal and transmitting a positive pulse upon detecting a first type of edge in the input signal and transmitting a negative pulse upon receipt of a second type of edge in the input signal and a receiver circuit receiving the transmitted signals, removing noise in the received signal and reconstructing the input signal using a differential comparator.

Abstract: A transmitter of a transition minimized differential signaling (TMDS) system includes a current source, a pair of switches configured to be connected to the current source and switch a current of the current source, and a monitoring unit configured to monitor a potential of a connection node between the current source and the pair of switches. The pair of switches is connected to a receiver of the TMDS system through a first line and a second line, respectively. The monitoring unit monitors the potential of the connection node based on a power supply voltage applied to the receiver and current switching of the pair of switches.

Abstract: An embodiment is a method and apparatus to decode a signal using channel information. A channel state estimator generates a tone value representing channel information. A quantizer quantizes the tone value. A combiner combines de-interleaved symbols weighed by the quantized tone value. A comparator compares the combined de-interleaved symbols with a threshold to generate a decoding decision. Another embodiment is a method and apparatus to decode a signal using averaging. A channel estimator provides a channel estimate. A multiplier multiplies a quantized output of a demodulator with the channel estimate to produce N symbols of a signal corresponding to a carrier. A de-interleaver de-interleaves the N symbols. An averager averages the N de-interleaved symbols to generate a channel response at a carrier.

Abstract: A data communications system having a plurality of communication devices including a host having a first receiver and a second receiver; and one or more clients, each client including a transmitter coupled between a signal node and a transmitter node, the transmitter selectively transmitting a multistate signal from the signal node to the transmitter node; and a single conductor daisy-chain loop redundantly communicating each multistate signal from each the transmitter to both receivers, the single conductor daisy-chain loop electrically communicating each transmitter node to the receivers. A data communications method including a) transmitting selectively a multistate signal from each of one or more clients; b) communicating electrically each multistate signal to a first location on a host using a single conductor coupled to each the client; and c) communicating electrically each multistate signal to a second location on the host using the single conductor.

Abstract: A power line carrier transmission apparatus according to an aspect of the present invention is a power line carrier transmission apparatus that transmits a transmission symbol via a transmission path. The transmission apparatus includes a frequency/time interleave unit that interleaves the transmission symbol, an OFDM modulation unit that OFDM-modulates the interleaved transmission symbol, a time-domain repeated transmission unit that repeatedly transmits the transmission symbol, which is modulated by the OFDM modulation unit, M times (M is an integer larger than 1) in a time domain.

Abstract: Systems and methods for enabling co-existence among power line communications (PLC) technologies are described. In some embodiments, a method performed by a PLC device, such as a PLC gateway, may include detecting a communication from foreign PLC device on a PLC network in response to a foreign preamble received by the PLC device, terminating transmissions to the PLC network for a network-specific co-existence Extended Interframe Space (cEIFS) time period in response to the foreign preamble, and resuming transmissions to the PLC network after expiration of the network-specific time period.

Abstract: A system and method for low-cost, fault tolerant, EMI robust data communications, particularly for an EV environment.

Abstract: A communication system comprising a first and second transceiver is provided. The first transceiver has a first and second port coupled to a communication medium, wherein a first differential capacitor couples the first and second ports together. The second transceiver has a third and fourth port each AC coupled to the communication medium, wherein a second differential capacitor couples the third and fourth ports together.

Abstract: A Powerline Communications (PLC) device includes a processing module, memory coupled to the processing module, and a PLC interface coupled to the processing module. The PLC device transmits a plurality of PLC queries, two of the plurality of PLC queries complying with differing and incompatible PLC communication standards. It then receives a plurality of responses from a plurality of other PLC devices, two responses received from respective PLC devices complying with two differing and incompatible PLC communication standards. The PLC device then directs each of the two PLC devices to transmit communications of the differing and incompatible PLC communication standards in an attempt to avoid PLC communication conflicts. The PLC device may establish non-PLC communications with a remote communications device. The PLC device may bridge communications between remote PLC devices and between a remote PLC device and a remote non-PLC device.

Abstract: A DSL communication system and a method for configuring a DSL communication system. The method includes training at least one anchor DSL modem transmitter to transmit information over at least one anchor line at an anchor bit rate that is determined based on an allowable tolerable noise level and a minimum allowable signal-to-noise ratio (SNR) margin; training one or more other DSL modem transmitter to transmit information over one or more other line at a bit rate that is determined by a current noise level and a target SNR margin, wherein the target SNR margin is higher than the minimum allowable SNR margin; and transmitting information by at least one trained DSL modem transmitter to at least one DSL modem receiver.

Abstract: A 500 Mbps transmission apparatus is provided. The apparatus uses a 2P line which is capable of providing a 500 megabits-per-second service via a 2P UTP cable by adding a sub-layer which serializes and de-serializes symbols which have rates matched with each other and are synchronized, while maintaining a 1000BASE-T unique hierarchical architecture.

Abstract: A communication apparatus repeatedly outputs a first multi-carrier signal SS during predetermined periods T1, T2, T3, . . . , and outputs a second multi-carrier signal RS whose phase vector is different from that of the first multi-carrier signal SS, at a predetermined timing based on the first multi-carrier signal SS. The communication apparatus further detects the second multi-carrier signal RS output from another communication apparatus, which uses a different communication method from the communication apparatus. Accordingly, both communication apparatuses can differentiate the first multi-carrier signal SS from the second multi-carrier signal RS without performing relatively cumbersome modulation and other processes.

Abstract: A transmitter and receiver for performing a signal select algorithm are provided. A transmitter for providing a signal on a line to be located includes at least one direct digital synthesizer, the direct digital synthesizer producing two component frequencies in response to an input square wave signal; and a feedback loop providing the input square wave.

Abstract: An apparatus to process an input signal received via a power line in a power line communication system includes a jammer remover and a jammer detector. The jammer remover removes interference resulting from transmission of electricity and the input signal over the power line from the input signal. The jammer remover generates a jammer-canceled signal using an adaptive filtering procedure. The jammer detector is coupled to the jammer remover to detect the interference.

Abstract: A method of communicating across power lines, including communicating data between at least two in-premises network devices along more than one channel, each channel defined by a different two of a plurality of wires in a subscriber premises, a first channel forming a straight path channel and a second channel forming a cross-path channel, and using multiple-input, multiple-output (MIMO) processing and maximum ratio combining (MRC) processing of data received along the plurality of wires, at least a portion of the data being received simultaneously from the straight path channel and the cross-path channel, wherein the wires are phase, neutral and ground wires of a subscriber premises.

Abstract: Coupling signals to a transmission line over a plurality of taps includes coupling a first signal onto a transmission line at a first tap, coupling a second signal onto a transmission line at a second tap, and controlling a phase for at least a portion of the first signal relative to a phase for a corresponding portion of the second signal.

Abstract: A system for transmitting data via a power line including: a first communications device and a second communications device, the first communications device including a transmit unit adapted to generate OFDM symbols to be transmitted using sub-carriers; a roll-off interval indication unit adapted to generate a transmit message indicating that no roll-off interval before and/or after the OFDM symbols is used when transmitting the data; the transmit unit being further adapted to transmit the transmit message; the second communications device including a receive unit adapted to generate the data from the transmitted OFDM symbols by taking into account the received transmit message.

Abstract: An analog to digital converter with increased sub-range resolution. The device includes an analog front end that produces an analog communication signal, a digital front end that receives a digital communication signal, and an Analog to Digital Converter (ADC) that samples the analog communication signal across a full-range. The ADC includes a plurality of sub-range ADCs, each sub-range ADC measuring the analog communication signal across at least one respective sub-range of the full-range, the plurality of sub-ranges extending across the full-range, a central sub-range ADC having greater quantization accuracy than at least one other sub-range ADC. The ADC also includes signal combining circuitry operable to process outputs of the plurality of sub-range ADCs to create the digital communication signal.

Abstract: A method for transmitting digital data via a line includes the steps of providing a clock signal and of transmitting the digital data in synchrony with the clock signal, the clock signal having a frequency that is variable over time.

Abstract: A communication apparatus for executing half-duplex data communication conforming to V.

Abstract: A coax network unit (CNU) is coupled to a coax line terminal (CLT) by a cable plant. In a discovery mode of operation, the CNU receives from the CLT one or more message packets that include one or more orthogonal frequency-division multiplexing (OFDM) symbols with cyclic prefixes of a first length. In a normal mode of operation subsequent to the discovery mode, the CNU receives data packets comprising OFDM symbols from the CLT. The OFDM symbols of the received data packets have cyclic prefixes of a second length that is less than the first length.

Abstract: An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to emphasize transition signal levels relative to repeated signal levels. The preferred equalizer includes an FIR transition filter using a look-up table. Parallel circuits including FIR filters and digital-to-analog converters provide a high speed equalizer with lower speed circuitry. The equalizer is particularly suited to in-cabinet and local area network transmissions where feedback circuitry facilitates adaptive training of the equalizer.

Abstract: To assist with the detection of unfiltered device(s), a system observes how the received noise changes between two links as the transmit signal is changed. Harmful unfiltered nonlinear devices will generate significant noise that depends on the transmitted signals; therefore, this additional noise can be quantified to some extent by comparing the observed noise for two different transmit signals. The total noise can be determined from the SNR if the received signal is known. The received signal may be read directly in some non-standard systems, or it may be determined from the known transmit signal and channel attenuation, which is sometimes the case in standard-compliant links, but often with a relatively large error. To circumvent this problem, certain embodiments of this invention only consider the change in noise between two links with the same channel attenuation. This differential comparison makes it unnecessary to accurately know the channel attenuation.