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Principles of OFDM

  • Mustafa Ergen
Chapter

Abstract

Orthogonal frequency division multiplexing (OFDM) is a multicarrier transport technology for high data rate communication system. The OFDM concept is based on spreading the high speed data to be transmitted over a large number of low rate carriers. The carriers are orthogonal to each other and frequency spacing between them are created by using the fast Fourier transform (FFT).

OFDM originates from frequency division multiplexing (FDM), in which more than one low rate signal is carried over separate carrier frequencies (Table 4.1). In FDM, separation of signal at the receiver is achieved by placing the channels suffi- ciently far apart so that the signal spectra does not overlap. Of course, the resulting spectral efficiency is very low as compared with OFDM, where a comparison is depicted in Fig. 4.1. Also, Fig. 4.2 shows an analogy of OFDM against single carrier and FDM in terms of spectral efficiency.

Keywords

Orthogonal Frequency Division Multiplex Channel Estimation Phase Noise Orthogonal Frequency Division Multiplex System LDPC Code 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Mustafa Ergen
    • 1
  1. 1.BerkeleyUSA

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