Multi-band wideband power amplifier digital predistorition system and method
First Claim
Patent Images
1. A digital predistortion system comprising:
- an RF input signal;
a power amplifier for providing an amplified output including a distortion characteristic;
a feedback signal derived from the amplified output including a representation of at least a portion of the distortion characteristic; and
predistortion logic responsive to the feedback signal and to the input signal for generating an aliased representation of the input signal and deriving predistortion coefficients based on the aliased signals, wherein a sampling rate of the aliased representation of the input signal is less than twice a maximum bandwidth of the input signal.
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Abstract
A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.
88 Citations
20 Claims
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1. A digital predistortion system comprising:
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an RF input signal; a power amplifier for providing an amplified output including a distortion characteristic; a feedback signal derived from the amplified output including a representation of at least a portion of the distortion characteristic; and predistortion logic responsive to the feedback signal and to the input signal for generating an aliased representation of the input signal and deriving predistortion coefficients based on the aliased signals, wherein a sampling rate of the aliased representation of the input signal is less than twice a maximum bandwidth of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for amplifying signals, the method comprising:
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receiving an RF input signal; detecting an amplified output from a power amplifier, the output being responsive to the RF input signal and including a distortion characteristic; deriving a feedback signal from the amplified output including a representation of at least a portion of the distortion characteristic; and generating, via predistortion logic responsive to the feedback signal and to the input signal, an aliased representation of the input signal and deriving predistortion coefficients based on the aliased signals, wherein a sampling rate of the aliased representation of the input signal is less than twice a maximum bandwidth of the input signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification