Low complexity transmitter structure for active antenna systems
AssigneeAT&T Intellectual Property I, L.P.
InventorSaiRamesh Nammi
Life of this patent
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Abstract
Various embodiments disclosed herein provide for a low complexity transmitter structure for active antenna arrays by reducing the number of digital predistortion extraction loops that need to be performed. Digital predistortion (DPD) corrects any non-linearities in a power amplifier. By determining which power amplifiers have similar characteristics in an array, and thus may use similar predistortion coefficients, once the DPD coefficients are determine for one of the grouped power amplifiers, DPD can be performed on each of the grouped power amplifiers based on the DPD coefficients.
Claims20
A first amplifier device, comprising:
- a processor;
- and
- a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
- sending a first output to a measurement component for a first determination, based on the first output, of a first amplification nonlinearity associated with the first amplifier device;
- receiving a first pre-distortion signal from a pre-distorter component, wherein the pre-distorter component determined the first pre-distortion signal based on the first amplification nonlinearity;
- and
- applying the first pre-distortion signal to the first amplifier device, wherein the first pre-distortion signal is further applied to a second amplifier device for a second determination of a second amplification nonlinearity associated with the second amplifier device.
A method, comprising:
- identifying, by a transmitter device comprising a processor, a first digital pre-distortion coefficient of a first power amplifier;
- identifying, by the transmitter device, a second digital pre-distortion coefficient of a second power amplifier, wherein the first digital pre-distortion coefficient and the second digital pre-distortion coefficient are respectively associated with a first power amplification nonlinearity associated with the first power amplifier and a second power amplification nonlinearity associated with the second power amplifier;
- determining, by the transmitter device, that the first digital pre-distortion coefficient and the second digital pre-distortion coefficient are similar according to a similarity criterion;
- and
- applying, by the transmitter device, a first pre-distortion signal respectively to the first power amplifier and the second power amplifier based on the first digital pre-distortion coefficient and the second digital pre-distortion coefficient.
A non-transitory machine-readable medium, comprising executable instructions that, when executed by a processor of a first amplifier device, facilitate performance of operations, comprising:
- transmitting a first output to a measurement device, wherein the measurement device determined a first amplification nonlinearity associated with the first amplifier device, based on the first output;
- and
- receiving a first pre-distortion signal from a pre-distorter device for application to the first amplifier device, wherein the pre-distorter device:
- determined that the first pre-distortion signal is based on the first amplification nonlinearity;
- and
- applied, based on a criterion, the first pre-distortion signal to a second amplifier device for a second amplification nonlinearity associated with the second amplifier device.
Dependencies are inferred from the claim text.