Method and apparatus for closed loop frequency control in a two-way communication system
US5450617A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 1993 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | May 25, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for closed loop frequency control in a two-way radio communication system (100) include a base communication unit (104) and a portable communication unit (108) having a portable-to-base initiation channel (202) assigned to a predetermined frequency. A signal is transmitted (502) from the portable communication unit (108) to the base communication unit (104) on an initiation frequency of approximately the predetermined frequency. The base communication unit (104) determines (506) from the signal a frequency correction factor (326) for recalibrating the initiation frequency in accordance with the predetermined frequency. The frequency correction factor (326) is communicated (512) to the portable communication unit (108), and the portable communication unit (108) recalibrates (516) the initiation frequency in response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.