Multi-band wide band power amplifier digital predistortion system
First Claim
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1. A digital predistortion system comprising:
- a multi-band input signal;
at least one power amplifier for providing an amplified output including a distortion characteristic;
a feedback signal derived from the amplified output, the feedback signal including a representation of at least a portion of the distortion characteristic; and
predistortion logic responsive to an aliased representation of the feedback signal for generating predistortion coefficients for linearizing the amplified output of the power amplifier, wherein a sampling rate of the aliased representation of the feedback signal is less than twice a maximum bandwidth of the feedback 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.
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Citations
20 Claims
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1. A digital predistortion system comprising:
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a multi-band input signal; at least one power amplifier for providing an amplified output including a distortion characteristic; a feedback signal derived from the amplified output, the feedback signal including a representation of at least a portion of the distortion characteristic; and predistortion logic responsive to an aliased representation of the feedback signal for generating predistortion coefficients for linearizing the amplified output of the power amplifier, wherein a sampling rate of the aliased representation of the feedback signal is less than twice a maximum bandwidth of the feedback signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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 signal and including a distortion characteristic; deriving a feedback signal from the amplified output, the feedback signal including a representation of at least a portion of the distortion characteristic; and generating, via predistortion logic responsive to an aliased representation of the feedback signal, predistortion coefficients for linearizing the amplified output of the power amplifier, wherein a sampling rate of the aliased representation of the feedback signal is less than twice a maximum bandwidth of the feedback signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification