摘要:
A method, system and apparatus to self-determine equalization parameters for a channel. An initiator sends an equalization insensitive signal (EIS) to a responder on channel to be equalized and begins a count. A responder responds with an EIS. When the initiator receives the response EIS the count is terminated. The count, which constitutes a measure of delay in the channel, may be used to determine desirable equalization parameters for the channel.
摘要:
An apparatus comprises at least one vectoring engine and a cross-connect coupled to the vectoring engine. The cross-connect is to couple with each of a plurality of customer premises equipment (CPE) devices via a respective DSL loop. An interface is to receive instructions for the cross-connect to couple the vectoring engine to a nonoverlapping subset of the CPE devices via the respective DSL loops. The interface is further to receive instructions for the vectoring engine to apply vectoring to the DSL loop via which to couple one of the CPE devices to the cross-connect.
摘要:
A method, system and apparatus to self-determine equalization parameters for a channel. An initiator sends an equalization insensitive signal (EIS) to a responder on channel to be equalized and begins a count. A responder responds with an EIS. When the initiator receives the response EIS the count is terminated. The count, which constitutes a measure of delay in the channel, may be used to determine desirable equalization parameters for the channel.
摘要:
Techniques are provided herein for training a digital predistortion module in a wireless communication device. A controller identifies one or more participating wireless devices to participate in a training session during which the particular wireless device makes test transmissions and the one or more participating wireless devices make measurements based on reception of the test transmissions sent by the particular wireless device. The controller sends commands to the particular wireless device and to the one or more participating wireless devices to initiate the training session. The controller receives measurement data from the one or more participating wireless devices based on reception of the test transmissions from the particular wireless device during the training session and determines predistortion parameters for use by the particular wireless device based on the measurement data.
摘要:
A receiver circuit includes: an equalization circuit that equalizes a first signal to obtain a second signal, and adjusts a characteristic of an equalization in accordance with an error between the second signal and a third signal; and a first offset adjustment circuit that adjusts an offset of the first signal in accordance with an error signal indicating the error.
摘要:
A receiver circuit includes: an equalization circuit that equalizes a first signal to obtain a second signal, and adjusts a characteristic of an equalization in accordance with an error between the second signal and a third signal; and a first offset adjustment circuit that adjusts an offset of the first signal in accordance with an error signal indicating the error.
摘要:
An adaptive-equalizer initialization system performs three functions: frequency offset estimation, taps estimation for chromatic dispersion filters, and taps initialization for an adaptive equalizer. The system contains hardware FFT and peak detector units that sense a pure tone that marks the beginning of a known, short data sequence.
摘要:
Disclosed methods and systems measure acoustic responses to training signals activated prior to communication sessions. Profiles related to the acoustic responses are saved and adapted during communication sessions. Training signals may have uniform frequency distributions over a frequency range and may be in response to user inputs, timeouts, or predetermined events. In the next excessive divergence is detected, an adapted profile may be substituted by an original, trained profile.
摘要:
An adaptive-equalizer initialization system performs three functions: frequency offset estimation, taps estimation for chromatic dispersion filters, and taps initialization for an adaptive equalizer. The system contains hardware FFT and peak detector units that sense a pure tone that marks the beginning of a known, short data sequence.
摘要:
An apparatus and methods for recovering a clock and a data stream from a source synchronous input data stream are disclosed. The apparatus comprises a filter, a decision feedback equalizer (DFE), a phase error detector, and a clock generator. The input data stream is coupled to the filter and the DFE. The DFE synchronizes the input data stream to a clock generated by the clock generator. A filter output and a DFE output are each coupled to the phase error detector. During an initialization period, the phase error detector conveys a phase error to the clock generator based on one or more phase error estimates of the filter output and during a period of steady-state operation, the phase error detector conveys a phase error to the clock generator based on one or more phase error estimates of the DFE output. The output of the DFE comprises a recovered data stream.