Overview
ABSTRACT
The OFDM (Orthogonal Frequency Division Multiplex) is used in wireless and cellular networks as well as in digital television. Its function is to transmit parallel data on a significant number of subcarriers. In this article we explain how such transmission is effected simply through Fourier transforms and how orthogonality between the subcarriers is achieved. We not only review the advantages of the OFDM but also the issues it raises in radio systems as well as the techniques which allow us to address them. Finally, we briefly present the OFDM parameterization for various radio systems.
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Xavier LAGRANGE : Professor - Télécom Bretagne
INTRODUCTION
OFDM (Orthogonal Frequency Division Multiplex) is used in wireless and cellular networks, and for digital television. It consists in transmitting data in parallel over a very large number of subcarriers. This treatise shows how such transmission is simply achieved using Fourier transforms, and how orthogonality between subcarriers is obtained. It discusses the advantages and problems of OFDM in radio systems, and techniques for compensating for them. Finally, it briefly explains how to set up OFDM for different radio systems.
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KEYWORDS
| | | | | | | radio transmission | cellular networks | wireless networks | digital television
Principle of the OFDM transmission - usage in cellular systems
OFDM in a nutshell
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