Adaptive digital pre-distortion circuit using output reference signal and method of operation
US6751447B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1999 |
| Grant date | Jun 15, 2004 |
| Priority date | — |
| Expiry date | Dec 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3252
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There is disclosed a pre-distortion correction circuit for use in an RF transmitter having a transmit path for receiving and amplifying an RF input signal. The pre-distortion correction circuit modifies distortion in the RF output signal caused by an RF power amplifier in the transmit path. The pre-distortion circuit comprises: 1) feedback circuitry coupled to an output of the transmit path for demodulating and digitizing the distorted RF output signal to thereby produce a first demodulated digital output signal; and 2) a pre-distortion calculation controller coupled to the feedback circuitry for comparing the first demodulated digital output signal to adjacent channel power (ACP) profile data stored in the pre-distortion calculation controller and generating therefrom pre-distortion correction values. The pre-distortion correction values are used to pre-distort the RF input signal to thereby cause the RF output signal to more closely resemble an ideal RF output signal within the limits of the ACP profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.