A method is for processing a channel analog signal coming from a transmission channel. The method may include converting the channel analog signal into a channel digital signal, and detecting a state of the transmission channel based on the channel digital signal to detect whether the transmission channel is, over an interval of time, one or more of linear and time invariant and linear and cyclostationary.

A method is for processing a channel analog signal coming from a transmission channel. The method may include converting the channel analog signal into a channel digital signal, and detecting a state of the transmission channel based on the channel digital signal to detect whether the transmission channel is, over an interval of time, one or more of linear and time invariant and linear and cyclostationary.

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

Control of a digital communication system having a plurality of communication lines on which signals are transmitted and received is implemented using a variety of methods and systems. According to one embodiment of the present invention, a method is implemented where the signals are affected by interference during transmission and each of the communication lines has at least one transmitter and at least one receiver. A model is created of the interference characteristics due to the signals carried on the communication lines. Interference characteristics for a line are determined based on the model and actual signals carried on other communication lines different from the line for which the characteristics are being determined. Actual interference is compensated for on the communication line using the determined interference characteristics.

The invention relates to an attenuator for stepwise attenuating a radio frequency signal. The attenuator comprises a first attenuation module that is configured to stepwise attenuate a radio frequency signal within a first signal frequency range. The attenuator comprises a second attenuation module that is configured to stepwise attenuate a radio frequency signal with a second signal frequency range, wherein the second attenuation module is arranged in parallel to the first attenuation module. The attenuator further comprises a switching element, wherein the switching element switches either the first attenuation module or the second attenuation module to an output node of the attenuator.

The invention relates to an attenuator for stepwise attenuating a radio frequency signal. The attenuator comprises a first attenuation module that is configured to stepwise attenuate a radio frequency signal within a first signal frequency range. The attenuator comprises a second attenuation module that is configured to stepwise attenuate a radio frequency signal with a second signal frequency range, wherein the second attenuation module is arranged in parallel to the first attenuation module. The attenuator further comprises a switching element, wherein the switching element switches either the first attenuation module or the second attenuation module to an output node of the attenuator.

A method is for processing a channel analog signal coming from a transmission channel. The method may include converting the channel analog signal into a channel digital signal, and detecting a state of the transmission channel based on the channel digital signal to detect whether the transmission channel is, over an interval of time, one or more of linear and time invariant and linear and cyclostationary.

A method is for processing a channel analog signal coming from a transmission channel. The method may include converting the channel analog signal into a channel digital signal, and detecting a state of the transmission channel based on the channel digital signal to detect whether the transmission channel is, over an interval of time, one or more of linear and time invariant and linear and cyclostationary.

A welding system having a welding power supply and a processor is provided. The welding power supply is configured to provide a welding power for a welding application through a weld cable. The processor is disposed within the welding power supply and the processor is configured to transmit and receive data related to a welding operating parameter through the weld cable. The processor is also configured to determine an equalization filter coefficient related to the weld cable.

Systems and methods which provide injection-locked circuit configurations for radiating signals in the terahertz frequency range with improved phase noise and signal output power are described. Embodiments of the invention provide an injection-locked terahertz radiator system comprising a half-quadrature voltage controlled oscillator (HQVCO), a plurality of injection-locked frequency quadruplers (ILFQs), and antenna elements. In operation according to embodiments, injection-locking provided by the ILFQs may be utilized to facilitate individual optimization of the output power and the phase noise. Intrinsic-delay compensation and harmonic boosting techniques may be utilized in configurations of the foregoing injection-locked terahertz radiator system to optimize the phase noise of the HQVCO and the output power of the ILFQs, respectively. Embodiments of an injection-locked terahertz radiator system herein are implemented as a fully integrated solution with compact form factor, providing high reliability and low cost.