Patent application number | Description | Published |
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 |
20090021406 | Sub-channel distortion mitigation in parallel digital systems - A method and apparatus for compensating for gain offset, bias offset, and skew in a parallel processing environment is disclosed. The method and apparatus may be configured to compensate for mismatches between the sub-channel signals in a parallel ADC. This allows for accurate combination of the signals on the sub-channels. The method and apparatus may be utilized in a high speed data communication system having two or more channels, each of which are interleaved into two or more sub-channels. In one embodiment a DC loop processes signals on two or more sub-channels to account for and remove unwanted bias offset. In one embodiment a sub-channel gain mismatch compensation system (SCGMC) processes signals on two or more sub-channels to account for and remove unwanted gain offset. In one embodiment a skew compensation system, such as a parallel interpolator, processes signals on two or more sub-channels to remove unwanted skew across sub-channels. | 01-22-2009 |
20090116639 | Method and apparatus for crosstalk mitigation - A method and apparatus for noise cancellation in a multi-channel communication system is disclosed. In one embodiment this system is configured to cancel FEXT on a victim channel utilizing the signals received on the other channels. The processing benefits gained by a receiver's other filters, such as for example, the FFE and DFE filters, is utilized when generating a FEXT cancellation signal. As a result, the complexity of the apparatus that generates the FEXT cancellation signal may be made less complex since part of the processing burden is performed by other filter apparatus. In one configuration pre-code FEXT cancellation occurs in that a pre-code FEXT filter generates one or more pre-code FEXT cancellation signals corresponding to each of the other channels. The pre-code FEXT cancellation signals are combined, prior to transmission, with the signals associated with each of the other channels, to thereby pre-cancel FEXT prior to transmission. | 05-07-2009 |
20090125735 | Active idle communication system - To reduce power consumption and heat generation, an active idle system is proposed that monitors for an idle period and then, after a predetermined time, initiates a silent period. During the silent period data and idle frames are not transmitted. During the silent period, one or more transceiver components may be turned off or forced into some other power saving mode. The predetermined time may be any amount of time and is selected to balance network usage and power savings. Periodically during the silent period, such as at predetermined times, one or more sync or idle frames are transmitted. Received sync or idle frames are processed to maintain receiver settings, synchronization or equalizer adaptation. Restoring active data communication may occur by monitoring the channel during silent periods for a request or only during the predetermined times when sync or idle frames are sent. | 05-14-2009 |
20110074611 | Sub-channel distortion mitigation in parallel digital systems - A method and apparatus for compensating for gain offset, bias offset, and skew in a parallel processing environment is disclosed. The method and apparatus may be configured to compensate for mismatches between the sub-channel signals in a parallel ADC. This allows for accurate combination of the signals on the sub-channels. The method and apparatus may be utilized in a high speed data communication system having two or more channels, each of which are interleaved into two or more sub-channels. In one embodiment a DC loop processes signals on two or more sub-channels to account for and remove unwanted bias offset. In one embodiment a sub-channel gain mismatch compensation system (SCGMC) processes signals on two or more sub-channels to account for and remove unwanted gain offset. In one embodiment a skew compensation system, such as a parallel interpolator, processes signals on two or more sub-channels to remove unwanted skew across sub-channels. | 03-31-2011 |
20130044019 | SYSTEMS WITH BIAS OFFSET AND GAIN MISMATCH REMOVAL FROM PARALLEL TRANSMITTED SIGNALS - A system includes converters, first modules, second modules, and a multiplexer. The converters receive an analog signal and a respective one of multiple clock signals. Each of the converters samples the analog signal based on a respective clock signal to generate a respective digital signal. Each of the clock signals is out-of-phase with other ones of the clock signals. The first modules receive the digital signals generated by the converters, remove bias offsets from the digital signals to generate first output signals, and output each of the first output signals on a multiple channels. The second modules receive the first output signals, and based on the first output signals, remove or equalize gain mismatch between the channels to generate second output signals. The multiplexer receives the second output signals, and generates an output based on the second output signals. The output is a digital representation of the analog signal. | 02-21-2013 |
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 |
20150195784 | METHOD AND APPARATUS FOR REDUCING POWER CONSUMPTION OF A COMMUNICATIONS DEVICE DURING PERIODS IN WHICH THE COMMUNICATIONS DEVICE RECEIVES IDLE FRAMES FROM ANOTHER COMMUNICATIONS DEVICE - A first transceiver operable to establish a connection with a second transceiver over a channel. A receiver of the first transceiver maintains communication parameters for the connection with the second transceiver, and processes signals received over the channel according to the communication parameters. The receiver monitors for idle frames from the second transceiver, and begins running of a first idle period in response to detecting a predetermined number of consecutive idle frames. The receiver, during the first idle period, suspends adaptation of the communication parameters. At an end of the first idle period, the receiver receives a first frame from the second transceiver, selectively adapts the communication parameters based on the first frame, and selectively begins running of a second idle period. A transmitter of the first transceiver suspends transmitting frames to the second transceiver during the first idle period and the second idle period. | 07-09-2015 |