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Summary: T2B.4
Correlation Techniques for Estimation of Amplifier Nonlinearity
M. Y. Li, I. Galton, L. E. Larson and P. M. Asbeck
University of California, San Diego, La Jolla, CA 92093-0407
mili@ucsd.edu
Abstract -- Nonlinearity characterization is critical to
amplifier linearization. It is shown here that correlation
techniques can be used to provide an estimate of amplifier
nonlinearity. The output envelope is cross-correlated with a
test sequence generated by forming the product of multiple
uncorrelated input sequences, to yield estimates of the low
order nonlinearity coefficients. The proposed method can be
employed to estimate amplifier nonlinearity with IS-95
forward-link CDMA signals, in background during amplifier
operation.
Index Terms -- Correlation, power amplifiers, nonlinear
estimation.
I. INTRODUCTION
Power amplifier linearity is a critical characteristic in
many digital communication systems, since amplifier
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