Radio with a distortion compensation capability
First Claim
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1. A radio comprising;
- a power amplifier for amplifying a signal to be transmitted;
a distortion compensator for compensating a distortion of the power amplifier, said distortion compensator having a distortion compensation coefficient update part for updating distortion compensation coefficients based on a difference between a transmission input signal input to the power amplifier and a feedback signal of a transmission output signal output from the power amplifier, a memory part for storing said distortion compensation coefficients, and a distortion compensation coefficient multiplier for reading out the distortion compensation coefficient from said memory part according to a level of a transmission input signal and multiplying said transmission input signal by said distortion compensation coefficient; and
a bias voltage controller for determining a bias voltage of the power amplifier based on the level of the transmission input signal or a transmit power control signal so as to improve power efficiency of the power amplifier.
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Abstract
A radio comprises a power amplifier for amplifying a signal to be transmitted; a distortion compensation table storing distortion compensation coefficients for compensating a distortion of the power amplifier; a computing unit for updating the distortion compensation coefficient based on a difference between a transmission input signal and a transmission output signal; a bias voltage controller for applying a bias voltage to the power amplifier, said bias voltage determined based on a transmit control signal so as to maximize a power efficiency of the power amplifier.
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Citations
12 Claims
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1. A radio comprising;
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a power amplifier for amplifying a signal to be transmitted;
a distortion compensator for compensating a distortion of the power amplifier, said distortion compensator having a distortion compensation coefficient update part for updating distortion compensation coefficients based on a difference between a transmission input signal input to the power amplifier and a feedback signal of a transmission output signal output from the power amplifier, a memory part for storing said distortion compensation coefficients, and a distortion compensation coefficient multiplier for reading out the distortion compensation coefficient from said memory part according to a level of a transmission input signal and multiplying said transmission input signal by said distortion compensation coefficient; and
a bias voltage controller for determining a bias voltage of the power amplifier based on the level of the transmission input signal or a transmit power control signal so as to improve power efficiency of the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification