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US 8,577,311 B2Granted
Predistortion of amplifier input signals
AssigneeIntel Mobile Communications GmbH
InventorsNorman Wolf, Jan-Erik Mueller
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Abstract
Described herein are devices, methods, and techniques related to predistortion of amplifier signals based on an operating condition. Predistortion techniques are described that mitigate or eliminate the effects of variable operating conditions, including nonlinear effects, on amplified signals. Nonlinearities may be mitigated by compensating at a baseband signal prior to amplification, generally using scaling and a static characteristic that is valid for a broad range of operating conditions.
Claims5
A method comprising:
- performing predistortion on a baseband signal using a static characteristic under a first operating condition to produce a predistorted baseband signal;
- determining a second operating condition;
- comparing the first operating condition to the second operating condition;
- and
- modifying a property of the predistorted baseband signal based on the static characteristic and the comparison of the first operating condition to the second operating condition by scaling a linear gain component and/or a nonlinear component of the baseband signal,
- wherein comparing the first operating condition to the second operating condition results in determining a difference in one or more of the following:
- temperature, supply voltage, operating frequency, load condition, or bias setting;
- determining an operating condition characteristic based on the comparison of the first operating condition to the second operating condition;
- determining a single static nonlinear function that represents the operating condition characteristic;
- scaling the single static nonlinear function by a constant based on the comparison of the first operating condition to the second operating condition;
- and
- modifying the property of the predistorted baseband signal based on the scaled single static nonlinear function.
9 more elements
Dependencies are inferred from the claim text.