Patent application number | Description | Published |
20100311351 | TRANSMITTING DEVICE AND METHOD FOR DETERMINING TARGET PREDISTORTION SETTING VALUE - The present invention provides a transmitting device and a method for determining a target predistortion setting value. The transmitting device comprises: a setting value control unit, a predistortion unit, a transmitting circuit, a receiving circuit, and a determining unit. The present invention can predistort signals before a power amplifier in a transmitting device by a method of determining a target predistortion setting value (i.e. an optimal predistortion setting value) from a plurality of candidate predistortion setting values. In this way, signals outputted by the power amplifier in the transmitting device can be adjusted to an optimal state, so as to solve the distortion problem of the outputted signals of the power amplifier. | 12-09-2010 |
20100311360 | TRANSMITTER, METHOD FOR LOWERING SIGNAL DISTORTION, AND METHOD FOR GENERATING PREDISTORTION PARAMETERS UTILIZED TO LOWER SIGNAL DISTORTION - A transmitter includes a predistortion calculation unit, a transmitting circuit, a receiving circuit, an adjusting unit and a parameter generating and storing unit. The predistortion calculation unit is utilized for pre-distorting an input signal to generate a predistorted input signal according to a specific predistortion parameter. The transmitting circuit is utilized for processing the predistorted input signal to generate an output signal. The receiving circuit is utilized for receiving the output signal to generate a received signal. The adjusting unit is utilized for adjusting the received signal to generate an adjusted signal, where the adjusted signal is substantially equal to the input signal. The parameter generating and storing unit is utilized for generating the specific predistortion parameter, and updating at least one stored predistortion parameter according to the input signal and the adjusted signal. | 12-09-2010 |
20120230451 | DC OFFSET ESTIMATION DEVICE AND DC OFFSET ESTIMATION METHOD - A direct current (DC) offset estimation device includes a determining circuit and an estimation circuit. The determining circuit is arranged for comparing a plurality of bits of an access code in a packet with a first predetermined value, respectively, and accordingly generating a determining result. The estimation circuit is coupled to the determining circuit, for estimating a DC offset according to the determining result. | 09-13-2012 |
20130215999 | METHOD FOR COMPENSATING MISMATCH OF IN-PHASE SIGNAL AND QUADRATURE SIGNAL OF TRANSMITTER/RECEIVER - A method for compensating mismatches of an in-phase signal and a quadrature signal of a transmitter/receiver is provided. The method includes: receiving a plurality of test signals to generate two groups of factors, respectively, where each group of factors is applied to two multipliers utilized for compensating a gain mismatch and a phase mismatch of the in-phase signal and the quadrature signal of the transmitter/receiver; then calculating a delay mismatch of the in-phase signal and the quadrature signal according to the two groups of factors. | 08-22-2013 |
20140016690 | Method of Reducing Signal Imbalance in Wireless Communication System - Multiplier coefficients are updated according to minimal power value of mixed signals in a wireless communication system. While using updated multiplier parameters, signal imbalance caused by a local oscillator or mismatch between analog elements of the wireless communication system can be reduced, so that the wireless communication system can be immune from noises. | 01-16-2014 |
20140018029 | Method of Compensating Signal Imbalance of Wireless Communication System - Filter coefficients are generated by testing a wireless communication system using single-tone signals. While using the filter coefficients in a filter module, signal imbalance caused by a local oscillator or analog elements in a wireless communication system can be eliminated, so as to prevent the wireless communication system from being affected by the noises. | 01-16-2014 |
20140307765 | WIRELESS TRANSMISSION SYSTEM, AND METHOD FOR DETERMINING DEFAULT GAIN OF WIRELESS TRANSMISSION SYSTEM - A method for determining a default gain of a wireless transmission system is provided. The wireless transmission system includes a signal transmission path and a signal feedback path coupled to the signal transmission path. The signal transmission path includes a power amplification circuit and a gain stage having a plurality of transmission gains. The method includes the following step: setting a gain of the gain stage as a specific transmission gain of the transmission gains; transmitting a plurality of test signals through the signal transmission path in sequence to generate a plurality of amplified test signals, wherein at least a portion of powers of the test signals correspond to the transmission gains, respectively; receiving the amplified test signals through the signal feedback path in sequence, and accordingly obtaining corresponding signal gains; and determining a default gain of the gain stage according to the signal gains. | 10-16-2014 |
20150015328 | PRE-DISTORTION METHOD AND ASSOCIATED APPARATUS AND NON-TRANSITORY MACHINE READABLE MEDIUM - A pre-distortion method includes: receiving an input data; and obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a power amplifier. A pre-distortion apparatus includes a receiver and a pre-distortion unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. A non-transitory machine readable medium stores a program code executed for performing steps of the proposed pre-distortion method. | 01-15-2015 |
20150054585 | PRE-DISTORTION METHOD, ASSOCIATED APPARATUS AND NON-TRANSITORY MACHINE READABLE MEDIUM - A pre-distortion method includes: receiving an input data; and obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier; and multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. A pre-distortion apparatus includes a receiver, a pre-distortion unit and a gain compensating unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. The gain compensating unit is utilized for multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. | 02-26-2015 |