System and method of pilot tone reuse in a feedforward amplifier
US6946906B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 2003 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/32
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method of pilot tone reuse. The present invention therefore provides a feedforward amplifier, comprising: an input that accepts a radio frequency signal having multiple carriers; a first control loop including a main amplifier block and a detector, wherein the first control loop generates a first carrier cancelled signal; a second control loop including a pilot generator, I/Q demodulator, vector modulator and first error amplifier block, wherein the pilot generator, I/Q demodulator and first error amplifier block amplify the first carrier cancelled signal and generates a pilot signal; a third control loop comprising a vector modulator and a second carrier cancellation detector; and a fourth control loop comprising of vector modulator, a second error amplifier block, and a pilot signal receiver for receiving the pilot signal generated by the pilot generator in the second error amplifier block such that the pilot signal is reused by the fourth control loop to thereby further cancel intermodulation distortion in the output of the main amplifier block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.