Systems and methods are provided for use of common mode rejection (CMR) for echo cancellation in uplink communications. A node in a cable network configured for transmitting downstream (DS) signals and receiving upstream (US) signals, may include echo cancelling circuits configured for cancelling echo introduced by the DS signals and/or transmittal of the DS signals, onto US signals and/or US reception path, to facilitate full-duplex (FDX) communications of the DS signals and US signal. The echo cancelling circuits may be configured for operating in the analog domain. The echo cancelling circuits may include an echo cancelling combiner configured for combining two or more upstream signals non-coherently.

A differential pair group equalization system includes a board providing a differential trace pair group with a plurality of differential trace pairs, each of a transmitter device and a receiver device are coupled to the board and the differential trace pairs in the differential trace pair group. At least one of the transmitter device and the receiver device operates to identify a first differential trace pair in the differential trace pair group, and adjust second differential trace pair equalization parameters for a second differential trace pair in the differential trace pair group. If it is determined that first differential trace pair signal transmission capabilities for the first differential trace pair have improved in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair the second differential trace pair equalization parameters are set for the second differential trace pair.

A differential pair group equalization system includes a board providing a differential trace pair group with a plurality of differential trace pairs, each of a transmitter device and a receiver device are coupled to the board and the differential trace pairs in the differential trace pair group. At least one of the transmitter device and the receiver device operates to identify a first differential trace pair in the differential trace pair group, and adjust second differential trace pair equalization parameters for a second differential trace pair in the differential trace pair group. If it is determined that first differential trace pair signal transmission capabilities for the first differential trace pair have improved in response to the adjustment of the second differential trace pair equalization parameters for the second differential trace pair the second differential trace pair equalization parameters are set for the second differential trace pair.

Systems and methods are provided for use of common mode rejection (CMR) for echo cancellation in uplink communications. A node in a cable network configured for transmitting downstream (DS) signals and receiving upstream (US) signals, may include echo cancelling circuits configured for cancelling echo introduced by the DS signals and/or transmittal of the DS signals, onto US signals and/or US reception path, to facilitate full-duplex (FDX) communications of the DS signals and US signal. The echo cancelling circuits may be configured for operating in the analog domain. The echo cancelling circuits may include an echo cancelling combiner configured for combining two or more upstream signals non-coherently.

Circuit and method for modulating filter coefficients of a frequency channelizer having a filter bank include: receiving a wide spectrum input signal; modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme; and inputting frequency offset compensation caused by the modulation, and output signals of the frequency channelizer to an application processing circuit to convert the output signals to their original center frequencies.

Circuit and method for modulating filter coefficients of a frequency channelizer having a filter bank include: receiving a wide spectrum input signal; modulating the filter coefficients of the filter bank to sweep a center frequency of each channel of the frequency channelizer, using a modulation scheme; and inputting frequency offset compensation caused by the modulation, and output signals of the frequency channelizer to an application processing circuit to convert the output signals to their original center frequencies.

An inspection apparatus for use in wellbores in the oil and gas industries relates in general to the field of transmission of data between downhole module in a wellbore and a controlling module at the surface. The invention provides a method and apparatus for determining analog filter parameters for an analog front end comprising a plurality of filter stages receiving signals from a telemetry module, by repeating the steps of; receiving a signal of a known frequency and processing said signal by determining the magnitude of the frequency of the received signal until a plurality of signals have been received and processed; calculating an optimum set of filter parameters in dependence upon the measured frequency magnitudes and a predefined set of filter stage frequency responses.

An inspection apparatus for use in wellbores in the oil and gas industries relates in general to the field of transmission of data between downhole module in a wellbore and a controlling module at the surface. The invention provides a method and apparatus for determining analogue filter parameters for an analogue front end comprising a plurality of filter stages receiving signals from a telemetry module, by repeating the steps of; receiving a signal of a known frequency and processing said signal by determining the magnitude of the frequency of the received signal until a plurality of signals have been received and processed; calculating an optimum set of filter parameters in dependence upon the measured frequency magnitudes and a predefined set of filter stage frequency responses.

Systems and methods for improving data communication over less than perfect power lines or transmission lines are described. The systems and methods allow for pushing out electrically any null within a frequency range of interest and/or for lossless transmission by providing impedance matching between communication devices and the transmission line. This is achieved by implementing line equalizing modules within the transceivers, at the transmitter side and/or the receiver side, or by plugging, as a stand-alone module, into an electrical outlet within a building. The line equalizing module includes multiple inductor-capacitor cells coupled in cascade where multiple switches allow for selective and concurrent connection between the inductor-capacitor cells. In another embodiment, the line equalizing module includes variable inductor-capacitor cells. The line equalizing module provides a variable propagation delay that allows for stretching electrically the transmission line. Further improvement may achieve by adjusting the operational frequency using an up-conversion or down-conversion operation.

Systems and methods for improving data communication over less than perfect power lines or transmission lines are described. The systems and methods allow for pushing out electrically any null within a frequency range of interest and/or for lossless transmission by providing impedance matching between communication devices and the transmission line. This is achieved by implementing line equalizing modules within the transceivers, at the transmitter side and/or the receiver side, or by plugging, as a stand-alone module, into an electrical outlet within a building. The line equalizing module includes multiple inductor-capacitor cells coupled in cascade where multiple switches allow for selective and concurrent connection between the inductor-capacitor cells. In another embodiment, the line equalizing module includes variable inductor-capacitor cells. The line equalizing module provides a variable propagation delay that allows for stretching electrically the transmission line. Further improvement may achieve by adjusting the operational frequency using an up-conversion or down-conversion operation.