Patent application number | Description | Published |
20100309832 | PARTIAL DMM RECEPTION TO REDUCE STANDBY POWER - Methods and systems to receive a multiple-carrier signal having periodic control packets, wherein each bit of a control packet is redundant on a plurality of the carrier signals, and to recover the control packet from a subset of the carrier signals in a standby mode. In an operational mode, a full bandwidth of the multiple-carrier signal digitized and processed. In a standby mode, the digitized signal may be digitally low pass filtered and decimated to obtain sample points corresponding to the subset of the carrier signals, and the samples may be processed with a reduced-bandwidth FFT and a reduced-bandwidth equalizer. Standby mode parameters corresponding to the subset of carrier signals may be selected based on signal to noise ratios (SNRs) of the signal sub-carriers. A minimum set of carrier signals needed to recover a control packet, and corresponding bit locations, may be determined from bit loading information and SNR. | 12-09-2010 |
20110069605 | COAXIAL NETWORK COMMUNICATION NODE AND METHODS FOR COMMUNICATING MULTIMEDIA OVER A COAXIAL NETWORK WITH REDUCED-LENGTH CYCLIC PREFIXES - A coaxial network communication node receives multimedia content with one or more other nodes in a coaxial network. The node determines a delay-spread of a coaxial channel based on receipt of a probe from a transmitting node and configures a channel-shortening time-domain equalizer (TEQ) filter to effectively shorten the channel based on the delay spread. The node instructs the transmitting node to shorten a length of a cyclic prefix for subsequent packet-based transmissions to be received from the transmitting node. The probe is stored and reused until the channel-shortening TEQ filter converges. The nodes may be configured to communicate in accordance with the Multimedia over Coax Alliance (MoCA®) specifications. | 03-24-2011 |
20110310950 | COAXIAL NETWORK COMMUNICATION NODE AND METHODS FOR COMMUNICATING WITHIN A MoCA NETWORK WITH REDUCED-LENGTH CYCLIC PREFIXES - A coaxial network communication node receives multimedia content with one or more other nodes in a Multimedia over Coax Alliance (MoCA®) coaxial network. The node determines a delay-spread of a coaxial channel based on a probe received from a transmitting node during a link-maintenance operation (LMO) cycle. The probe is stored and reused during the LMO until the channel-shortening TEQ filter converges. The node configures a channel-shortening time-domain equalizer (TEQ) filter to effectively shorten the channel and instructs the transmitting node to shorten a length of a cyclic prefix for subsequent packet-based transmissions. | 12-22-2011 |
20120195346 | COMMUNICATION DEVICE AND METHOD FOR PACKET-BASED OFDM COMMUNICATIONS WITH DIFFERING LENGTH CYCLIC PREFIXES - A network communication device is receive packet-based orthogonal frequency division multiplexed (OFDM) transmissions from one or more other devices in a network over a communication channel. The network communication device may determine a delay spread of the communication channel based on receipt of a probe signal from a transmitting device, configure a channel filter to effectively shorten the channel based on the delay spread, and instruct the transmitting device to shorten a length of a cyclic prefix for subsequent packet-based OFDM transmissions to be received from the transmitting device over the channel. | 08-02-2012 |
20120321010 | FULL SPECTRUM MODULATOR FOR DIGITAL TELEVISION SIGNALS - A full spectrum modulator processes a plurality of CATV channels from separate paths. Each path has (i) a first filter for pulse shaping an input channel signal and upsampling a channel frequency thereof, (ii) an interpolator for interpolating the output of the first filter to a common sample rate, and (iii) a decimator for centering the output of the interpolator on a predetermined channel bandwidth. An IDFT processor receives channel signal outputs from the decimators. A polyphase filter bank receives IDFT processed parallel channel signals from the IDFT processor. A commutator converts the processed parallel channel signals from the polyphase filter bank to a single stream of data. A second filter upsamples the single stream of data to a fixed output sampling rate and low pass filters alias signals therefrom. Both standard and harmonically related carrier CATV channel frequency plans are accommodated. | 12-20-2012 |
20140140285 | COMMUNICATION DEVICE AND METHOD FOR PACKET-BASED OFDM COMMUNICATIONS WITH DIFFERING LENGTH CYCLIC PREFIXES - A network communication device is receive packet-based orthogonal frequency division multiplexed (OFDM) transmissions from one or more other devices in a network over a communication channel. The network communication device may determine a delay spread of the communication channel based on receipt of a probe signal from a transmitting device, configure a channel filter to effectively shorten the channel based on the delay spread, and instruct the transmitting device to shorten a length of a cyclic prefix for subsequent packet-based OFDM transmissions to be received from the transmitting device over the channel. | 05-22-2014 |
20150078463 | METHOD AND APPARATUS FOR POWER LINE COMMUNICATIONS DISTORTION COMPENSATION - A method and apparatus for harmonic distortion compensation in power line communications. In one embodiment, the method comprises analyzing a waveform generated by a transmitter of a power line communications transceiver (PLCT), wherein the waveform is analyzed to determine harmonic information for one or more harmonics of a carrier waveform of the PLCT; computing, based on the harmonic information, one or more harmonic compensation coefficients; and pre-distorting, based on the one or more harmonic compensation coefficients, the carrier waveform such that the one or more harmonics are reduced below a threshold. | 03-19-2015 |
20150270910 | METHOD AND APPARATUS FOR IMPULSE NOISE MITIGATION FOR POWER LINE NETWORKING - A method and apparatus for impulse noise mitigation. In one embodiment, the method comprises identifying one or more impulse noise affected samples of a communication signal transmitted via power line communications; creating, based on the identified one or more impulse-noise affected samples, one or more erasures; and adaptively controlling a correlation threshold for packet preamble detection, wherein the correlation threshold is adaptively controlled based on the one or more erasure. | 09-24-2015 |