A Spectrum-Sensing DPD Feedback Receiver With [Formula Omitted] Reduction in ADC Acquisition Bandwidth and Sample Rate

This paper presents a feedback receiver for the digital predistortion (DPD) of radio frequency (RF) power amplifiers (PAs). In contrast to conventional architectures, the receiver samples in the frequency domain. By randomly selecting a frequency bin in each sampling interval, the PA model is identi...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. I, Regular papers Vol. 66; no. 9; p. 3340
Main Authors Hammler, Nikolaus, Cathelin, Andreia, Cathelin, Philippe, Murmann, Boris
Format Journal Article
LanguageEnglish
Published New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.01.2019
Subjects
Bandwidths
Feedback
Power amplifiers
Prototypes
Radio frequency
Sampling
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Summary:This paper presents a feedback receiver for the digital predistortion (DPD) of radio frequency (RF) power amplifiers (PAs). In contrast to conventional architectures, the receiver samples in the frequency domain. By randomly selecting a frequency bin in each sampling interval, the PA model is identified with substantially lower acquisition bandwidth and sampling rate. The receiver prototype is implemented in a 28-nm FD-SOI technology and samples at 4MS/s instead of the full Nyquist rate of 168MS/s for a 20-MHz Long Term Evolution (LTE) signal with spectral regrowth. The prototype is shown to linearize a 4-W small base station power amplifier from an adjacent channel leakage ratio (ACLR) of −35 dBc to −47.7 dBc, after processing only about 250 samples.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2019.2920828