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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

Modulation

As was discussed in “Modulation” in Chapter 1, modulation can be done by changing the amplitude, phase or frequency of transmitted Radio Frequency (RF) signal. For an OFDM system, the first two methods can be used. Frequency modulation cannot be used because subcarriers are orthogonal in frequency and carry independent information. Modulating subcarrier frequencies would destroy the orthogonality property of the subcarriers; this makes frequency modulation unusable for OFDM systems.

The main design issue of the modulator is the constellation used. Constellation is the set of points that can be transmitted on a single symbol. The used constellation affects several important properties of a communication system; for example, bit error ...

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Publisher Resources

ISBN: 0672321572Purchase book