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arXiv · 1702.03596

Novel Baseband Equivalent Models of Quadrature Modulated All-Digital Transmitters

Omer Tanovic·Rui Ma·Koon Hoo Teo
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Abstract

In this paper an exact baseband equivalent model of a quadrature modulated all-digital transmitter is derived. No restrictions on the number of levels of a digital switched-mode power amplifier (SMPA) driving input, nor the pulse encoding scheme employed, are made. This implies a high level of generality of the proposed model. We show that all-digital transmitter (ADT) can be represented as a series connection of the pulse encoder, discrete-time Volterra series model of fixed degree and memory depth, and a linear time-varying system with special properties. This result suggests a new analytically motivated structure of a digital predistortion (DPD) of SMPA nonlinearities in ADT. Numerical simulations in MATLAB are used to verify proposed baseband equivalent model.

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Omer Tanovic, Rui Ma, Koon Hoo Teo. 2017-02-13. Novel Baseband Equivalent Models of Quadrature Modulated All-Digital Transmitters. https://arxiv.org/abs/1702.03596

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