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OFDM Wireless LANs: A Theoretical and Practical Guide
book

OFDM Wireless LANs: A Theoretical and Practical Guide

by John Terry, Juha Heiskala
December 2001
Intermediate to advanced content levelIntermediate to advanced
336 pages
8h 42m
English
Sams
Content preview from OFDM Wireless LANs: A Theoretical and Practical Guide

Adaptive Predistortion Techniques

Heretofore, the adaptive techniques presented have been receiver algorithms. These techniques were derived to mitigate the noise associated with clipping. Herein, we consider adaptive techniques at transmitter or adaptive predistortion algorithms. The first technique reviewed, developed by H. Kang et al in [14], considers a predistortions algorithm for a cascade of HPA and linear filter. In the approach, the memoryless HPA preceded by a linear filter, as shown in Figure 5.17, is modelled as a Wiener system [11]. Precompensation is achieved via adaptive algorithm derived using a stochastic gradient decent method [11].

Figure 5.17. A simplified block diagram of the baseband equivalent OFDM transceiver. © 1995 IEEE. ...
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ISBN: 0672321572Purchase book