Patent application number | Description | Published |
20100026385 | METHOD FOR CALIBRATING A POWER AMPLIFIER AND DEVICE USING THE SAME - A calibration device for a power amplifier includes a calculation unit, a first storage unit and a multiplier. The calculation unit is utilized for generating a calibration factor according to a value of a characteristic parameter of the power amplifier. The first storage unit coupled to the calculation unit, for storing the calibration factor. The multiplier is coupled to the first storage unit and a baseband unit, for multiplying a baseband signal outputted from the baseband unit by the calibration factor for generating an input signal to the power amplifier. | 02-04-2010 |
20100097137 | LOOKUP TABLE GENERATION METHOD AND RELATED DEVICE FOR A PREDISTORTER - A lookup table generation method for a predistorter comprises sending a first single tone signal with a maximum expected amplitude to a channel simulation device including the power amplifier, estimating a closed loop gain and a closed loop phase of the power amplifier according to the first single tone signal and a first simulation output signal generated outputted by the channel simulation device, sending a plurality of single tone signals to the channel simulation device, each single tone signal having an amplitude different from all others of the plurality of single tone signals and lower than the maximum expected amplitude, generating a plurality of predistortion parameters according to the closed loop gain, the closed loop phase, the plurality of single tone signals and a plurality of simulation output signals outputted by the channel simulation device, and storing the plurality of predistortion parameters in a lookup table of the predistorter. | 04-22-2010 |
20100211990 | Packet Detection Method for Wireless Communication Device and Related Device - A packet detection method for a wireless communication device includes receiving a wireless communication signal and demodulating the wireless communication signal into a packet signal; comparing the packet signal according to an access code to generate a comparison result; estimating energy distribution of the packet signal to generate an estimation result; and determining whether the packet signal belongs to the wireless communication device according to the comparison result and the estimation result. | 08-19-2010 |
20100259244 | Method and Apparatus for Estimating Cable Length - 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. | 10-14-2010 |
20100260291 | Carrier Recovery Device and Related Method - A carrier recovery device for a communication receiver is disclosed. The carrier recovery device includes an A/D converter for converting an analog signal received by the communication receiver to a digital signal, a frequency compensator coupled to the A/D converter for compensating frequency of the digital signal according to a carrier frequency offset value, a filter coupled to the frequency compensator for filtering the digital signal to generate an output signal, and a frequency offset estimator coupled to the filter and the frequency compensator for estimating the carrier frequency offset value according to the output signal and providing the carrier frequency offset value to the frequency compensator for implementing carrier recovery. | 10-14-2010 |
20100262850 | Power Budget Controller and Related Method for Ethernet Device - 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. | 10-14-2010 |
20100290333 | METHOD FOR ENHANCING ETHERNET CHANNEL IMPAIRMENT AND APPARATUS USING THE SAME - 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. | 11-18-2010 |
20110032976 | Start-up Procedure Method and Timing Recovery for Receiver of Communication System - 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. | 02-10-2011 |
20110038404 | Method and Apparatus for Estimating Channel Length in Wired Communication System - 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. | 02-17-2011 |
20110095820 | METHOD FOR PRE-DISTORTING A POWER AMPLIFIER AND THE CIRCUIT THEREOF - 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. | 04-28-2011 |
20130028358 | Narrowband Interference Detector - The present invention discloses a narrow band interference detector for a receiver of a communication system. The narrow band interference detector includes a numerically-controlled oscillator (NCO), for generating an oscillating signal according to a time-variable frequency; a mixer, for mixing an input signal with the oscillating signal, to generate a mixed signal; a phase lock loop (PLL), for locking the mixed signal during a detection period according to the time-variable frequency; a first switch, for controlling a connection between the NCO and the PLL according to a desirable narrow band interference signal type of the at least one narrow band interference signal; and a narrow band determination unit, for determining at least one narrow band interference signal according to a low frequency component of the mixed signal, the time-variable frequency and the desirable narrow band interference signal type of the at least one narrow band interference signal. | 01-31-2013 |
20130058391 | Timing Recovery Module and Timing Recovery Method - The present invention discloses a timing recovery module of a receiver of a communication system. The timing recovery module includes a timing error calculating unit, for calculating a timing error according to an output signal of an equalizer of the receiver; and a multiplexer, for receiving the timing error, a specific negative timing error and a specific positive timing error, and outputting one of the timing error, the specific negative timing error and the specific positive timing error as a timing adjustment value according to a main tape coefficient, a most negatively adjacent tape coefficient and a most positively adjacent tape coefficient of the equalizer. | 03-07-2013 |