Abstract: Systems and methods are provided for peak to average power ratio (PAPR) reduction in multichannel digital front-ends (DFEs). A transmitter may be configured to reduce PAPR during multichannel transmission, with the reducing comprising: generating a plurality of frequency-domain symbols, each of which corresponding to a particular one of a plurality of subcarriers; assigning the subcarriers to a plurality of channels, wherein a number of channels is less than a number of subcarriers; and generating a plurality of time-domain signals corresponding to the channels. An adjustment to reduce PAPR may be applied to at least one of the time-domain signals, with the adjustment being based on symbols boundaries. The adjustment may comprise sign inversion. Adjusted and unadjusted waveforms may be generated for two or more of the time-domain signals; and selection may be made between generated adjusted waveforms based on particular criteria. The criteria may comprise lowest peak.

Abstract: Systems and methods are provided for utilizing adaptive inter-frame gap reduction in Multimedia over Coax Alliance (MoCA®) networks. A network node that is configured as network controller within a Multimedia over Coax Alliance (MoCA®) network may receive communication timing related information associated with each of a plurality of network nodes in the MoCA network; assess based on the communication timing related information, communication timing for each pair of network nodes in the plurality of network nodes; and adaptively configure communications between each pair of network nodes in the plurality of network nodes based on the assessing. The configuring may comprise adjusting timing related parameters or fields in packets. The timing related parameters or fields may comprise inter-frame gap (IFG) fields in physical layer (PHY) packets. The communication timing related information may comprise ranging information or ranging-based timing information determined based on the ranging information.

Abstract: Methods and systems are provided for use of tunable bandwidths. An example system may comprises a plurality of filters, with each of filters being configured for filtering signals corresponding to a particular frequency band associated with a particular stream. One or more adjustments may be determined and applied to one or more of the plurality of filters. The adjustments may comprise modifications to at least one frequency band associated with at least one of the plurality of filters. Leakage affecting the plurality of filters may be measured or estimated, and a compensation adjustment applicable to particular transmitted and/or received signals may be determined based on measured or estimated leakage. The leakage may be estimated based on analysis of digital baseband signals corresponding to transmitted and/or received signals.

Abstract: Methods and systems are provided for loop-through for multi-chip receivers. An example system may comprise a plurality of receiver chips, with each one of the plurality of receiver chips being operable to generate a corresponding output, and a first one of the plurality of receiver chips is operable to generate a loop-through feed based on processing of an input feed to the system, and each of remaining one or more receiver chips may be operable to process the loop-through feed to generate its corresponding output. The processing of the input feed in the first chip may comprise applying one or more processing functions may comprise one or both of amplification and analog-to-digital conversion. Each of the remaining one or more receiver chips may be operable to generate its corresponding output by applying one or more processing functions, comprising one or both of channelization and demodulation.

Abstract: A cable modem termination system (CMTS) may communicate with a plurality of cable modems using a plurality of orthogonal frequency division multiplexed (OFDM) subcarriers. The CMTS may determine a performance metric of each of the cable modems. For each of the OFDM subcarriers and each of the cable modems, the CMTS may select physical layer parameters to be used for communication with that cable modem on that OFDM subcarrier based on a performance metric of that cable modem. The parameters may be selected for each individual modem and/or each individual subcarrier, or may be selected for groups of modems and/or groups of subcarriers. The parameters may include, for example, one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate.

Abstract: A cable modem termination system (CMTS) may determine, for a plurality of cable modems served by the CMTS, a corresponding plurality of SNR-related metrics. The CMTS may assigning the modems among a plurality of service groups based on the SNR-related metrics. For any one of the modems, the CMTS may configure physical layer communication parameters to be used by the one of the modems based on a SNR-related metric of a service group to which the one of the modems is assigned. The physical layer communication parameters may include one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate. The CMTS and the modems may communicate using orthogonal frequency division multiplexing (OFDM) over a plurality of subcarriers, and the physical layer communication parameters may be determined on a per-subcarrier basis.

Abstract: A receiver includes a plurality of input paths for receiving and processing a plurality of input RF signals. The input paths isolate one or more portions of corresponding ones of the received input RF signals, and combine the isolated portions of the corresponding ones of the received input RF signals onto one or more output signals. A bandwidth of the isolated portions of the corresponding ones of the received input RF signals and a bandwidth of the output signals are variable. The isolated portions of the corresponding ones of the received plurality of input RF signals are extracted and utilized to generate the output signals. The portions of the corresponding ones of the received plurality of input RF signals may be mapped into one or more channel slots in the time domain. The channel slots may be assigned in the frequency domain to one or more frequency bins.

Abstract: A network device comprising: a first connector for connecting to an external network from which data may be communicated using a first frequency band in accordance with a first communications protocol; a second connector for connecting to an on-premises network; and circuitry residing in a signal path between said first connector and said second connector. The circuitry may be operable to: permit a first portion of the first frequency band to pass from the first connector to the second connector; block a second portion of said first frequency band from passing from the first connector to the second connector; and communicate, via the second connector, signals that are normally communicated in frequency ranges not including the first frequency band, into the on-premises network using the first frequency band. The signals may include packets formatted in accordance with Multimedia over Coax Alliance (MoCA) standards.

Abstract: A coupling device for use in a hybrid fiber coaxial (HFC) network may be configured to detect a control message and determine from the message a period for which a cable modem downstream is to be transmitting a desired transmission, disable an upstream path through it when there is only noise incident on the upstream path, and enable the upstream path during the period when a desired transmission from a cable modem downstream of the coupling device is incident on the upstream path. The coupling device may be a trunk amplifier, a distribution amplifier, or a splitter. The coupling device may comprise a single upstream interface coupled to a plurality of downstream interfaces. The enabling and/or disabling may be in response to a signal strength indicated by the SSI being below a threshold.

Abstract: Methods and systems are provided for band translation with protection. A signal processing circuitry (chip) may be configured to handle a plurality of signals, comprising at least a first signal corresponding to internal communication within an in-premises network and at least a second signal originating from a source external to the in-premises network; and to process on-chip the plurality of input signals, to generate one or more output signals. In this regard, at least one output signal may comprise components corresponding to the first signal and the second signal; and the processing may be configured to mitigate on-chip, during generating of the one or more outputs, at least one effect of including in the at least one output signal a first component corresponding to one of the first signal and the second signal on a second component corresponding to the other one of the first signal and the second signal.

Abstract: A cable modem termination system (CMTS) may communicate with a plurality of cable modems using a plurality of orthogonal frequency division multiplexed (OFDM) subcarriers. The CMTS may determine a performance metric of each of the cable modems. For each of the OFDM subcarriers and each of the cable modems, the CMTS may select physical layer parameters to be used for communication with that cable modem on that OFDM subcarrier based on a performance metric of that cable modem. The parameters may be selected for each individual modem and/or each individual subcarrier, or may be selected for groups of modems and/or groups of subcarriers. The parameters may include, for example, one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate.

Abstract: A communication receiver which applies signal processing for quantitatively estimating receive signal factors such as communication channel quality, signal characteristics, and overall system received bit error rate (BER) or packet error rate (PER) and which applies a general algorithm for mapping these estimated factors to control receiver performance and minimize power consumption.

Abstract: A cable modem termination system (CMTS) may determine, for a plurality of cable modems served by the CMTS, a corresponding plurality of SNR-related metrics. The CMTS may assigning the modems among a plurality of service groups based on the SNR-related metrics. For any one of the modems, the CMTS may configure physical layer communication parameters to be used by the one of the modems based on a SNR-related metric of a service group to which the one of the modems is assigned. The physical layer communication parameters may include one or more of: transmit power, receive sensitivity, timeslot duration, modulation type, modulation order, forward error correction (FEC) type, and FEC code rate. The CMTS and the modems may communicate using orthogonal frequency division multiplexing (OFDM) over a plurality of subcarriers, and the physical layer communication parameters may be determined on a per-subcarrier basis.

Abstract: A network device may comprise a first connector for connecting to an external network in which upstream data over cable service interface specification (DOCSIS) signals are communicated using a first frequency band and downstream cable and/or DOCSIS signals are communicated using a second frequency band. The device may also comprise a second connector for connecting to an on-premises network, as well as circuitry residing in a signal path between the first connector and the second connector. The circuitry may be operable to permit the downstream cable and/or DOCSIS signals to pass from the first connector to the second connector, and to block the upstream DOCSIS signals from passing from the first connector to the second connector. The circuitry may be operable to transmit, via the second connector, non-DOCSIS signals into the on-premises network using the first frequency band.

Abstract: Systems and methods are provided for detection and compensation of dielectric resonator oscillator frequency drift. DRO frequency drift detection and compensation may comprise, for a received input signal, detecting one or more channels in the input signal, determine frequency offset for each of the detected channels; determining determine dielectric resonator oscillator (DRO) frequency drift based on combining frequency offsets of the detected channels, and determining, based on the DRO frequency drift, one or more adjustments for compensating for the DRO frequency drift. The DRO frequency drift may be determined based on analysis of an intermediate signal generated during processing of the input signal.

Abstract: A coupling device for use in a hybrid fiber coaxial (HFC) network may be configured to disable an upstream path through it when there is only noise incident on the upstream path, and enable the upstream path through it when a desired transmission from a cable modem downstream of the coupling device is incident on the upstream path. The coupling device may be a trunk amplifier, a distribution amplifier, a splitter, or the like. The coupling device may comprise a single upstream interface coupled to a plurality of downstream interfaces. The enabling and/or disabling may be in response to a signal strength indicated by the SSI being below a threshold and/or in response to one or more control messages indicating whether any downstream cable modem is, or will be, transmitting.

Abstract: Circuitry for use in a network controller comprises a processor and memory. The network controller is operable to control communications in a network comprising a plurality of devices connected via a shared coaxial cable. The circuitry is operable to maintain one or more data structures that hold per-sender-receiver-pair link parameters and per-sender-receiver-pair bandwidth grant status. The circuitry is operable to, in response to receipt of a reservation request on the shared coaxial cable, decide which one or more of a plurality of subbands and which one or more of a plurality timeslots to reserve for the transmission based, at least in part, on the per-sender-receiver-pair link parameters and the per-sender-receiver-pair bandwidth grant status in the one or more data structures. The circuitry is operable to generate a reservation grant message that indicates the decided one or more subbands and the decided one or more timeslots.

Abstract: A first Multimedia over Coax Alliance (MoCA) compatible device comprises a physical layer profiling circuit and a spectrum abstraction circuit. The physical layer profiling circuit may for example be operable to measure a performance metric for each of a plurality of subbands on a shared coaxial cable of a MoCA network. The spectrum abstraction circuit may for example be operable to select, based at least in part on the measured performance metric, a subset of the subbands to be used for communication over the coaxial cable between the first MoCA-compatible device and a second MoCA-compatible device. The spectrum abstraction circuit may for example be operable to receive an indication of whether channel bonding is to be used for the communication over the coaxial cable between the first MoCA-compatible device and the second MoCA-compatible device.

Abstract: A transceiver system may be configured to provide tunable bandwidths. The transceiver may comprise a signal processing component and a filtering component, which may comprise a plurality of filters. The signal processing component may determine one or more adjustments that are applicable to one or both of a first filter that is configured for filtering signals corresponding to a first frequency band associated with a first stream, and a second filter that is configured for filtering signals corresponding to a second frequency band associated with a second stream. The one or more adjustments may correspond to modifications in one or both of the first frequency band and the second frequency band. The one or more adjustments may be communicated to the filtering component, which may apply the adjustments to one or more of the plurality of filters.

Abstract: Methods and systems are provided for multi-chip receivers with loop-through feeds. A receiver that comprises plurality of chips may receive one or more input feeds, with each of the chips generating a corresponding output comprising data (e.g., channels) extracted from the one or more input feeds. Only a first chip may handle reception and/or initial processing of the one or more input feeds, with each one of the remaining chips processing a loop-through feed generated in the first chip, in order to generate the corresponding output of that chip. The loop-through feed may be generated based on the one or more input feeds. In this regard, the loop-through feed may comprise at least one of the one or more input feeds that is partially processed in the first one of the plurality of chips.