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US 8,283,978 B2Granted
CDMA/OFDM compliant wireless communication from a non-linear finite impulse response filter configured with coefficients that are responsive to an input signal magnitude
OwnerPhilip Brown, John Ibison +3inventors
InventorsPhilip Brown, John Ibison, Jeremy Segar, Stephen Cooper, Frank Friedman
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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.
Claims1
A method comprising:
- producing a wireless standard compliant signal by digitally applying distortion correction coefficients that are derived from a simplified pre-distortion model comprising estimation bands that represent a subset of signal magnitude bands used to digitally apply the distortion correction coefficients;
- wherein the simplified pre-distortion model is based on amplifier distortion values sorted into the estimation bands based on a subset of different amplifier power levels to produce an amplifier distortion corrected signal wherein the coefficients are not required to be stored in a lookup table before being used to produce the corrected signal;
- converting the corrected signal to a radio frequency signal;
- and
- amplifying the corrected signal.
2 more elements
Dependencies are inferred from the claim text.