Method and apparatus for calibration of a wireless transmitter
First Claim
1. A method of calibrating transmission circuitry of an installed communication unit, comprising the steps of:
- interrupting routine operation;
generating a driving signal at a first level which drives a circuit element into saturation;
measuring a first signal power level produced by said circuit element;
setting said level of said driving signal to a second level that is lower than said first driving signal level;
measuring a second signal power level produced by said circuit element;
comparing said first signal power level to said second signal power level; and
if said second signal power level is less than said first signal power level by more than a predetermined amount, using said second driving signal level as a maximum drive level for said circuit element upon resuming routine operation.
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Abstract
When an installed wireless remote unit is operating in the field, routine operation is interrupted to enter a calibration mode. In calibration mode, the compression point of a circuit element is determined by applying a series of different drive levels to the circuit element. Based upon the determination of the compression point, a maximum transmission point is selected for the remote unit. Upon resumption of normal operation, the remote unit uses the maximum transmission point to limit the signal power level transmitted over the wireless link. As time passes or operating conditions change, the calibration process is re-executed.
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Citations
8 Claims
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1. A method of calibrating transmission circuitry of an installed communication unit, comprising the steps of:
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interrupting routine operation;
generating a driving signal at a first level which drives a circuit element into saturation;
measuring a first signal power level produced by said circuit element;
setting said level of said driving signal to a second level that is lower than said first driving signal level;
measuring a second signal power level produced by said circuit element;
comparing said first signal power level to said second signal power level; and
if said second signal power level is less than said first signal power level by more than a predetermined amount, using said second driving signal level as a maximum drive level for said circuit element upon resuming routine operation. - View Dependent Claims (2, 3)
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4. An apparatus for calibrating transmission circuitry of an installed communication unit, comprising:
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means for interrupting routine operation;
means for generating a driving signal at a first level which drives a circuit element into saturation;
means for measuring a first signal power level produced by said circuit element;
means for setting said level of said driving signal to a second level that is lower than said first driving signal level;
means for measuring a second signal power level produced by said circuit element; and
means for comparing said first signal power level to said second signal power level, and, if said second signal power level is less than said first signal power level by more than a predetermined amount, using said lower value as a maximum drive level for said circuit element upon resuming routine operation. - View Dependent Claims (5, 6)
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7. A method of limiting the output power of a wireless unit, comprising the steps of:
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interrupting routine operation of an installed communication unit;
selecting a maximum transmission point for said installed communication unit by applying a series of different drive levels to a circuit element within the installed communication unit to determine a compression point of the circuit element; and
resuming routine operation using said maximum transmission point to limit a transmission power of said installed communication unit - View Dependent Claims (8)
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Specification