Abstract: A method for enhancing Ethernet channel impairment comprises the steps of sending a sequence to a receiver in a slave transceiver by a master transceiver, and training cancellation filter coefficients of an echo canceller and a near-end cross talk canceller in the master transceiver before the receiver of the slave transceiver converges.

Abstract: A method for estimating a length of a channel in a wired communication system includes receiving a plurality of signals transmitted continuously via the channel, determining relation between a signal and at least one signal in the of the plurality of signals, to generate a decision result, and determining the length of the channel according to the decision result.

Abstract: A method for estimating cable length includes steps of generating a detection signal to a cable, wherein the detection signal includes a first pulse and a second pulse with opposite voltages in sequence; receiving a refection signal of the detection signal from the cable; and determining length of the cable according to a superposed waveform of the detection signal and the refection signal.

Abstract: A method for pre-distorting a power amplifier comprises the steps of: inputting a baseband digital training signal with time-varying amplitude into a transmitting end in a single operation; converting the baseband digital training signal to a radio-frequency analog training signal, and converting the radio-frequency analog training signal to a radio-frequency analog transmitting signal via a power amplifier; receiving the radio-frequency analog transmitting signal at a receiving end, and converting the received signal to a baseband digital receiving signal; and calculating parameters for pre-distorting the power amplifier by estimating the characteristic curve of the power amplifier according to the baseband digital receiving signal.

Abstract: A method for estimating a length of a channel in a wired communication system includes receiving a plurality of signals transmitted continuously via the channel, determining relation between a signal and at least one signal in the of the plurality of signals, to generate a decision result, and determining the length of the channel according to the decision result.

Abstract: A method for starting up a receiver of a communication system includes training an interference canceller of the receiver, keeping the interference canceller in a tracking state after the interference canceller converges, and starting to train a timing recovery device of the receiver.

Abstract: A method for enhancing Ethernet channel impairment comprises the steps of sending a sequence to a receiver in a slave transceiver by a master transceiver, and training cancellation filter coefficients of an echo canceller and a near-end cross talk canceller in the master transceiver before the receiver of the slave transceiver converges.

Abstract: A power budget controller for an Ethernet device is disclosed. The Ethernet device is connected with another Ethernet device through a cable. The power budget controller includes a length estimation unit, a power selection unit and a link monitoring unit. The length estimation unit is utilized for generating a detection signal to the cable and for estimating length of the cable according to a refection waveform of the detection signal. The power selection unit is coupled to the length estimation unit, and utilized for adjusting a transmission power of the Ethernet device according to an estimation result of the cable length. The link monitoring unit is coupled to the power selection unit, and utilized for monitoring a link status of the Ethernet device to determine whether the transmission power is selected correctly.

Abstract: A method for estimating cable length includes steps of generating a detection signal to a cable, wherein the detection signal includes a first pulse and a second pulse with opposite voltages in sequence; receiving a refection signal of the detection signal from the cable; and determining length of the cable according to a superposed waveform of the detection signal and the refection signal.