Equivalent Complex Baseband Model for Digital Transmitters Based on 1-bit Quadrature Pulse Encoding

Ruotsalainen, Henri; Leder, Norbert; Pichler, Bernhard; Arthaber, Holger; Magerl, Gottfried

doi:10.1109/tcsi.2015.2476395

Cited by 8 publications

(1 citation statement)

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“…Main deficiency of such black box modeling is the lack of insight into structure and internal dynamics of the nonlinear system being approximated. An exact baseband equivalent model for a quadrature modulated ADT was given in [9], but only for 2 level pulse encoding scheme (taking precisely ±1 values), and without an obvious extension to multi-level case. An analog baseband equivalent model was recently given in [10].…”

Section: Introductionmentioning

confidence: 99%

Novel baseband equivalent models of quadrature modulated all-digital transmitters

Tanovic

Teo

2017

2017 IEEE Radio and Wireless Symposium (RWS)

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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 timevarying 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.Index Terms-Digital predistortion, all-digital transmitter, baseband equivalent model.

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Section: Introductionmentioning

confidence: 99%