System and method of phase modulation control in RF signal generation
US7046970B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2001 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Feb 18, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Phase modulation control techniques and supporting apparatus avoid phase discontinuity at the outset of RF signal generation. Such discontinuities might arise from phase control instabilities associated with transmit start up or from abrupt changes in phase at the beginning of transmit signal generation. A transmitter uses starting phase values in advance of transmit data phase values to initialize phase modulation control circuits or functions. Once phase control is stabilized, and possibly after other criteria are met, the transmitter transitions from using the starting phase values to using the transmit data phase values, so that a transmit signal begins carrying phase modulations associated with the desired transmit data. The phase modulation control techniques described herein apply where transmitters employ direct phase modulation in RF signal generation, and may have particular applicability to burst-type RF transmitters, such as a transmitter employing direct modulation of amplitude and phase in an EDGE communication system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.