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MODULATION SIGNAL CALIBRATION BETWEEN A MODEM MODULE AND RADIO MODULE OF A WIRELESS MODEM USING FEEDBACK
MODULATION SIGNAL CALIBRATION BETWEEN A MODEM MODULE AND RADIO MODULE OF A WIRELESS MODEM USING FEEDBACK
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机译:使用反馈的无线调制解调器的调制解调器模块与无线电模块之间的调制信号校准
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摘要
A radio-frequency output signal having a specified characteristic 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 substantially 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 radio unit, and a feedback signal path from the radio unit to the modem unit. The modem unit includes control circuitry for outputting 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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