Mediatek Corporation

Mediatek Singapore Pte. Ltd.

Toru Matsuura

Paul Cheng Po Liang

Chiyuan Lu

James Han Wang

Osama K A Shana'a

Ching-Chia Cheng

Fei Song

YuenHui Chee

A method for compensating for degradation of a signal during transmission of the signal includes: performing thermal detection and accordingly generate a thermal detection result indicative of a temperature of a signal processing circuit; and performing property adjustment to adjust a predetermined property of the signal according to the thermal detection result. The property adjustment is performed on the signal according to the thermal detection result associated with previously transmitted signal. After performing the property adjustment, a characteristic value of the signal reaches a preset level.

Method for compensating for degradation of signal during transmission of the signal and transmitter utilizing the same

A transmitter includes a signal generator arranged to generate a digital baseband signal representative of a signal for transmission; a digital predistortion, DPD, circuit configured to predistort the digital baseband signal; and a power amplifier is arranged to amplify the predistorted signal. The DPD circuit includes a first signal shaping circuit operably coupled to the signal generator and the DPD predistortion circuit and configured to receive the generated digital signal and apply first envelope shaping to shape the predistortion applied to at least the amplitude of the generated digital signal and produce a first DPD signal; a second signal shaping circuit operably coupled to the signal generator and an output of the DPD predistortion circuit and configured to receive and apply the second envelope shaped digital signal to the first DPD signal and produce a second envelope shaped DPD signal. A multiplier is configured to receive and multiply the digital signal and the second envelope shaped DPD signal and output a digitally predistorted signal for transmission.

Transmitter, communication unit and method for limiting spectral re-growth

A transmitter includes a signal generator arranged to generate a digital baseband signal representative of a signal for transmission; a digital predistortion, DPD, circuit configured to predistort the digital baseband signal; and a signal adjustment circuit operably coupled to the signal generator and the DPD circuit and configured to receive the generated signal and apply shaping to adjust the predistortion applied to the envelope of the generated signal.

Transmitter, communication unit and methods for limiting spectral re-growth

Examples of front-end modules, apparatuses and methods for coupling compensation in a closed-loop digital pre-distortion (DPD) system are described. The closed-loop DPD circuit may include a PA and a loopback path. The PA may receive a PA input signal and amplify the PA input signal to provide a PA output signal proportional to a product of the PA input signal and a gain of the PA. The loopback path may receive the PA output signal to output a loopback signal. A forward coupling and a backward coupling may exist between the PA input signal and an output of the loopback path. The output of the loopback path may be proportional to a product of the PA output signal and a gain of the loopback path. The loopback path may include a coupling cancellation mechanism configured to cancel couplings between the PA input signal and the loopback signal.

Growing community of inventors

Cupertino, CA, United States of America

Toru Matsuura