System and method to reduce phase modulation bandwidth
US6621876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Mar 20, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/367
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A signal source generates a phase-modulated output signal responsive to a phase-modulation signal. A phase splitter splits the phase-modulated output signal into two or more phase-offset output signals. A switch provides a selected one of the phase-offset output signals from the phase splitter to a transmit amplifier circuit. Large phase transitions in the phase-modulation signal are detected and reduced to decrease modulation bandwidth requirements at the signal source. When a phase transition in the phase-modulation signal is reduced, the switch is coherently switched from one phase-offset output signal to another to substantially restore the full phase transition in the output signal presented to the transmit amplifier circuit. In this manner, the transmit amplifier receives substantially the same phase transitions as are in the original phase-modulation signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.