A Background Spread-Spectrum Radio Frequency Nonlinear Parameter Measurement Technique

We report a new correlation-based direct sequence spread-spectrum technique that estimates low-pass-equivalent Volterra coefficients for weakly nonlinear RF systems. The methodology provides robust coefficient estimates at test signal amplitudes well below the operating signal level during normal sy...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2018-09, Vol.66 (17), p.4516-4526
Main Authors: Wichman, Adam R., Larson, Lawrence E.
Format: Article
Language:English
Subjects:
Baseband
Compression tests
Distortion measurement
Frequency measurement
Intermodulation distortion
Kernel
Measurement techniques
Microwave power amplifiers
nonlinear modeling
Nonlinear systems
Nonlinearity
Power amplifiers
real-time kernel extraction
Volterra series
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Summary:We report a new correlation-based direct sequence spread-spectrum technique that estimates low-pass-equivalent Volterra coefficients for weakly nonlinear RF systems. The methodology provides robust coefficient estimates at test signal amplitudes well below the operating signal level during normal system operation, demonstrating that the technique can be used for "background" nonlinearity measurement. We demonstrate the methodology by measuring third-order Volterra kernels for a power amplifier chain operated in compression with a 10 MHz bandwidth signal at 1960 MHz.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2018.2855651