Adaptive digital pre-distortion correction circuit for use in a transmitter in a digital communication system and method of operation
US6449466B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1998 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Dec 30, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/267
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
There is disclosed an adaptive pre-distortion correction circuit for use in an RF transmitter having a transmit path capable of receiving a digital input baseband signal and generating a modulated RF output signal. The adaptive pre-distortion circuit comprises 1) input sampling means coupled to an input of the transmit path for capturing from a first digital input sample of amplitude X; 2) demodulation circuitry coupled to an output of the transmit path for receiving and demodulating the modulated RF output signal to produce a digital output baseband signal; 3) output sampling means coupled to the demodulation circuitry for capturing a first digital output sample corresponding to the first input sample; and 4) processing means for comparing the first digital input sample and the first digital output sample and calculating a pre-distortion correction value corresponding to the amplitude X. The pre-distortion correction value are stored in a look-up table and are continually updated to compensate for circuit changes over time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.