Multi-band wide band power amplifier digital predistortion system
First Claim
1. A multi-band digital predistortion system comprisinga multi-band input signal wherein the bands are centered on separate frequencies and the bandwidth of each band is substantially less than the frequency separation between the bands;
- at least one power amplifier for providing an amplified output including a distortion characteristic;
input aliasing logic for creating aliased images of each band, wherein the aliased image of a first band is in one Nyquist zone and the aliased image of a second band is in another Nyquist zone, each of the one Nyquist zone and the other Nyquist zone having a width of half of a sampling rate of the input signal;
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 aliased images for generating predistortion coefficients for linearizing the output of the power amplifier.
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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.
28 Citations
20 Claims
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1. A multi-band digital predistortion system comprising
a multi-band input signal wherein the bands are centered on separate frequencies and the bandwidth of each band is substantially less than the frequency separation between the bands; -
at least one power amplifier for providing an amplified output including a distortion characteristic; input aliasing logic for creating aliased images of each band, wherein the aliased image of a first band is in one Nyquist zone and the aliased image of a second band is in another Nyquist zone, each of the one Nyquist zone and the other Nyquist zone having a width of half of a sampling rate of the input signal; 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 aliased images for generating predistortion coefficients for linearizing the output of the power amplifier. - 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 a multi-band input signal wherein the bands are centered on separate frequencies and the bandwidth of each band is substantially less than the frequency separation between the bands; predistorting the multi-band input signal using predistortion coefficients generated by predistortion logic, such that a first aliased image of a first band of the multi-band input signal is in one Nyquist zone and a second aliased image of a second band of the multi-band input signal is in another Nyquist band, each of the one Nyquist zone and the other Nyquist zone having a width of half of a sampling rate of the input signal amplifying the predistorted multi-band input signal to generate an amplified output, the amplified output including a distortion characteristic, wherein the predistortion coefficients are updated using a feedback signal derived from the amplified output, including a representation of at least a portion of the distortion characteristic. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification