MODULATION SIGNAL CALIBRATION BETWEEN MODEM AND RADIO USING LOOPBACK
A radio-frequency output signal having a specified char-acteristic is produced using a combination of a calibrated radio unit in which a calibration factor is stored and an uncalibrated modem unit. The calibration factor is input to the modem unit from the radio unit, and the modem outputs to the ra...
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| creator | BEAUDOIN, J. F. DENIS DUTKIEWICZ, MAREK VANDERHELM, RONALD JOHN |
| description | A radio-frequency output signal having a specified char-acteristic is produced using a combination of a calibrated radio unit in which a calibration factor is stored and an uncalibrated modem unit. The calibration factor is input to the modem unit from the radio unit, and the modem outputs to the radio unit a signal of a nominal signal level determined in accordance with the calibration factor. An actual signal level of the signal is mesured, and a gain factor within the modem unit is adjusted until the nominal signal level and the actual signal level are sub-stantially equal. A wireless modem includes a calibrated radio unit and an uncalibrated modem unit coupled to the radio unit. A first signal path is provided from the modem unit to the ra-dio unit, and a feedback signal path from the radio unit to the modem unit. The modem unit includes control circuitry for out-putting across the first signal path a signal that is nominally of a desired signal level, and for adjusting a nominal signal level of the signal in accordance with information received across the feedback signal path. |
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| subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION |
| title | MODULATION SIGNAL CALIBRATION BETWEEN MODEM AND RADIO USING LOOPBACK |
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