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6 - General principles and design overview of digital predistortion

from Part II - DPD and CFR

Published online by Cambridge University Press:  07 October 2011

By
R. Neil Braithwaite
Edited by
Fa-Long Luo
Fa-Long Luo
Affiliation:
Element CXI, San Jose, California
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Summary

Introduction

Wireless communication systems use radio frequency (RF) signals to transmit data between base stations and mobile users. The RF power amplifier (PA) is located within the transmitter and is a key component of the down-link connecting the base station to the mobile. Power amplifiers tend to be either linear or efficient, but not both. Fortunately, an efficient power amplifier may be used within a digital transmitter if the nonlinear behavior of the PA is compensated using digital predistortion (DPD).

This chapter discusses digital predistortion techniques suitable for use in a digital transmitter. Section 6.2 reviews the nonlinear behavior of a power amplifier and its effect on the output spectrum. Section 6.3 provides an overview of digital predistortion avoiding equations for the most part. Details of the basic algorithms used appear in Section 6.4. Section 6.5 discusses some advanced topics in DPD.

Type
Chapter
Information
Digital Front-End in Wireless Communications and Broadcasting
Circuits and Signal Processing
 , pp. 143 - 191
Publisher: Cambridge University Press
Print publication year: 2011

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