Equivalent Baseband Models and Corresponding Digital Predistortion for Compensating Dynamic Passband Nonlinearities in Phase-Amplitude Modulation-Demodulation Schemes
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DPD_paper.pdf
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Accepted version
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657.71 KB
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Author(s)
Tanovic, Omer
Megretski, Alexandre
Li, Yan
Stojanovic, Vladimir
Osqui, Mitra
Date Issued
2018
Journal
IEEE Transactions on Signal Processing
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Version
Author's final manuscript
Abstract
© 1991-2012 IEEE. We consider equivalent baseband representation of transmission circuits in the form of a nonlinear dynamical system S in discrete time (DT) defined by a series interconnection of a phase-Amplitude modulator, a nonlinear dynamical system F in continuous time (CT), and an ideal demodulator. We show that when F is a CT Volterra series model, the resulting S is a series interconnection of a DT Volterra series model of the same degree and equivalent memory depth, and an LTI system with special properties. The result suggests a new, nonobvious, analytically motivated structure of digital precompensation of analog nonlinear distortions such as those caused by power amplifiers in digital communication systems. The baseband model and the corresponding digital compensation structure readily extend to OFDM modulation. MATLAB simulation is used to verify the preposed equivalent baseband model and demonstrate the effectiveness of the new compensation scheme, as compared to the standard Volterra series approach.
MIT Department
Massachusetts Institute of Technology. Laboratory for Information and Decision Systems
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1109/TSP.2018.2871385
