Methods of optimising power amplifier efficiency and closed-loop power amplifier controllers
First Claim
1. A closed-loop power amplifier distortion controller comprising:
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(a) a closed-loop pre-distortion control arranged to apply pre-distortion to the amplifier input signal automatically based on a measured predetermined output characteristic;
(b) measuring means operable to measure the amount of applied pre-distortion which is representative of distortion introduced by the amplifier; and
(c) control means for adjusting an operating parameter of the amplifier responsive to the amount of applied pre-distortion.
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Abstract
A significant part of the cost of a base station in the cellular mobile radio system is the power amplifier. Thus it is desirable to maximise usage of a power amplifier and in particular to gain the best power output from the amplifier or to improve its efficiency. Such power amplifiers, however, must operate within strict spectral boundaries and thus power amplifiers are typically over-specified in order to ensure that the spectral requirements are met. By measuring the output of the amplifier and determining distortion factors and then adaptively adjusting the operating characteristics of the amplifier, the degree of over-specification of the amplifier required may be reduced with consequent cost and environmental savings.
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Citations
19 Claims
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1. A closed-loop power amplifier distortion controller comprising:
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(a) a closed-loop pre-distortion control arranged to apply pre-distortion to the amplifier input signal automatically based on a measured predetermined output characteristic;
(b) measuring means operable to measure the amount of applied pre-distortion which is representative of distortion introduced by the amplifier; and
(c) control means for adjusting an operating parameter of the amplifier responsive to the amount of applied pre-distortion. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of optimising efficiency in a power amplifier comprising:
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(a) applying pre-distortion to the amplifier input signal automatically based on a measured output characteristic, (b) measuring the amount at applied pre-distortion which is representative of distortion introduced by the amplifier, and (c) controlling an operational parameter of the amplifier responsive to the amount of applied pre-distortion. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A base station for a radio network including:
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(a) a power amplifier, and (b) a closed-loop power amplifier distortion controller including a closed-loop pre-distortion control arranged to apply pre-distortion to the amplifier input signal automatically based on a measured predetermined output characteristic;
measuring means operable to measure the amount of applied pre-distortion which is representative of distortion introduced by the amplifier; and
control means for adjusting an operating parameter of the amplifier responsive to the amount of applied pre-distortion.
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19. A wireless communications network including a base station having:
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(a) a power amplifier, and (b) a closed-loop power amplifier distortion controller including a closed-loop pre-distortion control arranged to apply pre-distortion to the amplifier input signal automatically based on a measured predetermined output characteristic;
measuring means operable to measure the amount of applied pre-distortion which is representative of distortion introduced by the amplifier, and control means for adjusting an operating parameter of the amplifier responsive to the amount of applied pre-distortion.
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Specification