Abstract: A method and apparatus for measuring and tracking Impulse Noise parameters in a communication system are described. The method includes estimating one or more parameters of the impulse noise, the parameters including a period, an offset and duration of the impulse noise.

Abstract: A method and apparatus for providing synchronization data on demand are described. The method includes sending one or more synchronization parameters from a receiver to a transmitter in a data communication system, and adjusting transmission of synchronization data from a transmitter to a receiver using the one or more parameters sent by the receiver.

Abstract: Embodiments of methods and apparatuses for gating impulse noise in a communication system are described. In one embodiment, a quality measure of a received signal on a communication channel is not adjusted when corruption by impulse noise in the received signal is detected. In another embodiment, tuning parameters of a DSL modem are not adjusted when corruption by impulse noise in the received signal is detected.

Abstract: Embodiments of an apparatus, system, and method are described for a multi-carrier communication system that cancels at least some correlated noise estimated to be present in a channel in the multi-carrier communication system. Values of noise present on at least on reference channel in a multi-channel communication system may be measured. Correlated noise on a second target channel using the noise measurement on the reference channel may be estimated. A residual noise on the second target channel may be determined by canceling the estimated correlated noise on the second target channel.

Abstract: An apparatus and method of compensating for radio frequency interference (RFI) if present in a tone in a multiple tone system to derive an equivalent noise power that can be used in bit-loading to achieve a better bit rate.

Abstract: A multi-carrier communication system receives a plurality of data frames comprised of a plurality of bit groups in a data stream of a multi-carrier communication system, wherein one or more data frames are corrupt data frames, and corrects each corrupt data frame.

Abstract: A multi-carrier communication system receives up to R corrupted bit groups in one or more data frames of a multi-carrier communication system and corrects the up to R corrupted bit groups in the one or more data frames.

Abstract: A multi-carrier communication system receives a plurality of data frames comprised of a plurality of bit groups in a data stream of the multi-carrier communication system, wherein up to R bit groups are identified as corrupted by analyzing corresponding tone values, and corrects the up to R bit groups associated with one or more corrupt frames of the plurality of data frames.

Abstract: Methods and apparatuses for reducing effects of impulse noise in a DSL transmitter receiver device are described. According to certain embodiment, the method includes using a periodicity associated with the impulse noise affecting a DSL transmitter receiver device to determine data frames that are affected by the impulse noise, and sending a reduced data rate during those frames. In certain embodiments, no data is sent during those frames. The method further includes using a high margin bits and gain table, instead of a normal bits and gain table.

Abstract: Embodiments of an apparatus, system, and method are described for a multi-carrier communication system that detects for impulse noise present on a transmission medium. Values of peak error samples may be measured to determine an approximate magnitude of the average peak error samples present on a transmission medium. An average error value of all of the error samples may be measured to determine a standard deviation of a Gaussian distribution of background noise. An amount of peak error samples may be compared to a threshold value that is based upon a standard deviation derived from the background noise to determine if impulse noise is present on a particular tone.

Abstract: Apparatuses, systems, and methods for a multi-carrier communication system that detects and reduces an echo from a non-linear element present on the transmission medium. In an embodiment, a training period is established between a first transmitter-receiver device and a second transmitter-receiver device in the discrete multiple tone system that separates communication signals into two or more seperste frequency bands. Noise caused by an echo generated by a non-linear element present on the transmission medium is detected during the training period. The significance of the non-linear echo contribution to the overall ambient noise level present in the system may be determined.

Abstract: An apparatus, system, and method are described for multi-carrier communication using adaptive tone-pruning. The method may include transmitting a data-bearing signal over a plurality of tones on a communication loop within a plurality of communication loops and calculating a minimum tone cost according to a tone cost algorithm. The tone cost algorithm defines a tone cost associated with a selected tone within the plurality of tones. The tone cost of the selected tone is based on a predefined loading frequency and a signal-to-noise ration (SNR) of the selected tone. The method also may include determining a bit loading pattern for the data-bearing signal according to the minimum tone cost. This determination may occur in response to a determination that a minimum allowable transmission power is greater than a minimum required transmission power for the data-bearing signal.

Abstract: In general, various methods and apparatus are described that use a multi-tone receiver. The multi-tone receiver detects data in a multiple tone signal. The receiver has a detector module to measure a noise power level present in the system and to detect for an asymmetric Gaussian noise source in the background noise. An equivalent noise power is obtained by applying a compensating gain factor to the asymmetrical noise source. The gain factor is used when the detector indicates that the asymmetric Gaussian noise source exists in the background noise. Any bit-loading algorithm that is based on a symmetric Guassian noise source assumption can also be used with asymmetrical Guassian noise sources if this gain factor is applied.

Abstract: Various methods and apparatus are described that use a filter. A receiver may be configured to receive multi-tone signals. The receiver has a Time Domain Equalizer filter employing an algorithm to shorten a length of an incoming impulse response to equal to or less than a guard period by calculating a minimum mean square error solution in combination with measuring an inter-symbol interference of a channel.

Abstract: A method, system and apparatus for reliable multicarrier communication in the presence of timing phase error is disclosed. Phase noise due to a sampling-time phase mismatch between a transmitter device and a receiver device is measured in a signal. A Gaussian noise power level in the signal is determined, and a gain factor associated with the phase noise is calculated. The gain factor is applied to the Gaussian noise power level to calculate an equivalent noise power. In one aspect, the equivalent noise power is used to determine a signal-to-noise ratio. In another aspect, the signal is a multicarrier signal including a plurality of sub-carriers.

Abstract: A method, system and apparatus for reliable multicarrier communication in the presence of periodic impulsive interference is disclosed. A power level of noise in a signal is determined. An impulse noise in the signal is detected. A gain factor associated with the impulse noise is determined and applied to the noise power of the signal to calculate an equivalent noise power. In one aspect, the equivalent noise power is used to determine a signal-noise-ratio.

Abstract: A scheme (apparatus and methods) for recovering encoded data from a data signal representing one or more data symbols and subject to random errors and transient errors. A system in accordance with this scheme includes a transient error detector, a reliability detector, an erasure flagger, and a decoder. The transient error detector is coupled to receive the data signal and is configured to identify one or more characteristics (e.g., a starting location and a midpoint location) of a transient error (e.g., a TA) in the data signal. The reliability detector is configured to compute a reliability metric for each data symbol. The erasure flagger identifies erasures based upon signals received from the transient error detector and the reliability detector. The decoder is configured to treat a data symbol as an erasure or as a valid data symbol based upon the output of the erasure flagger.