Method and apparatus for measuring output power of devices for mobile communications
AssigneeAgilent Technologies, Inc.
InventorsDavid Dunne, Gabor Zoka
Life of this patent
Estimating the term…
Abstract
The output power of a signal generated by a mobile communications device is measured over a short period of time (e.g. one signal burst), and the data modulation carried by the signal is also determined. The measured power value is adjusted to compensate for variations due to the content of the data modulation. This enables the long-term average power output by the device to be determined more quickly than by averaging the power measured over many successive signal bursts.
Claims13
A method of measuring the output power of a communications device, comprising the steps of:
- receiving a signal output by a communications device;
- identifying a measurement interval in the signal;
- determining data encoded in the modulation over the measurement interval;
- deriving, from the data encoded in the modulation, a ratio of carrier power to average power of the signal over the measurement interval;
- measuring average power of the signal over the measurement interval;
- and
- multiplying the average power measured over the measurement interval by the ratio of carrier power to average power to derive an estimate of carrier power.
Apparatus for measuring the output power of a communications device, comprising:
- a receiver for receiving a signal output by a communications device;
- a measurement interval identifier for identifying a measurement interval in the signal;
- a demodulator for determining data encoded in the modulation over the measurement interval;
- a power measurement device for measuring average power of the signal over the measurement interval;
- and
- a device for deriving, from the data encoded in the modulation, a ratio of carrier power to average power of the signal over the measurement interval, and for multiplying the average power measured over the measurement interval by the ratio of carrier power to average power to derive an estimate of carrier power.
Dependencies are inferred from the claim text.