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US 8,301,090 B2Granted
Distributed mobile communication network
OwnerPhilip Brown, John Ibison +3inventors
InventorsPhilip Brown, John Ibison, Jeremy Segar, Stephen Cooper, Frank Friedman
Life of this patent
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Abstract
A digital pre-distortion system which can provide the flexibility to model the highly non-linear distortion associated with High Efficiency RF Power Amplifiers while through a novel implementation of a least squares estimation process allows an implementation well suited for an FPGA application where limited resources and in particular memory resources are available.
Claims3
A system comprising:
- a plurality of linear signal amplifiers for facilitating communication among a plurality of wireless handsets, wherein each of the plurality of amplifiers propagates wireless signals among the plurality of handsets using amplifier pre-distortion based on coefficients that are linearly interpolated from coefficients in a simplified pre-distortion model comprising estimation bands that comprise a subset of signal magnitude bands used by the amplifier pre-distortion;
- wherein the simplified pre-distortion model is derived from amplifier output values sorted into the estimation bands based on the signal magnitude.
A system comprising:
- a plurality of linear signal amplifiers for facilitating communication among a plurality of wireless handsets, wherein each of the plurality of amplifiers propagates wireless signals among the plurality of handsets using a model of the amplifier non-linearity derived from a complex matrix equation formed from a plurality of magnitude differentiated amplifier samples;
- wherein the model comprises:
- least squares optimizing each set of a series of limited amplifier output data sample sets;
- updating an intermediate matrix for deriving pre-distortion coefficients with each least squares optimized set thereby facilitating optimizing pre-distorter coefficients across a quantity of amplifier output samples that is larger than the limited amplifier output data sample set.
1 more element
A system comprising:
- a plurality of linear signal amplifiers for facilitating communication among a plurality of wireless handsets, wherein each of the plurality of amplifiers propagates wireless signals among the plurality of handsets using a plurality of pre-distortion coefficients that are calculated from coefficients in a simplified pre-distortion model comprising estimation bands that comprise a subset of signal magnitude bands used to apply the plurality of pre-distortion coefficients;
- wherein the simplified pre-distortion model is derived from amplifier output values sorted into the estimation bands based on the signal magnitude.
Dependencies are inferred from the claim text.