Reference signal pre-distortion for transmitter with frequency synthesizer based phase encoding
US6707857B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 2000 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Jul 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/364
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A variable frequency synthesizer is used during generation of a phase-encoded signal. The reference signal input to the frequency synthesizer is not held stable and constant, but is instead deliberately varied to control the output of the frequency synthesizer. This varying reference signal, referred to as the phase reference signal, is derived from traditional inphase and quadrature signals, as modified by a phase distorter. The phase distorter applies a pre-distortion to the inphase and quadrature signals so as to compensate for band limiting effects of the frequency synthesizer. The signal transmitted is then based on the phase-encoded signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.