Method, device, and radio for compensating for modulator frequency drift while allowing for data transmission
US5608761A · kind A · utility
5Cited by
6References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 1994 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Dec 9, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method (100), a device (300), and a radio (500) are described for compensating for modulator frequency drift while allowing for data transmission in a half-duplex frequency modulated communication system. An adjustment is made to a premodulation signal in such a way that when it is passed through a frequency modulator to provide a transmitter excitation signal, frequency drift is corrected. Subsequent to determining a training command, the transmitter excitation signal passes through a switch to a demodulator. The demodulator output is averaged and used in the adjustment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.