Chapter 2. OFDM Fundamentals

  1. Hui Liu and
  2. Guoqing Li

Published Online: 21 MAR 2006

DOI: 10.1002/0471757195.ch2

OFDM-Based Broadband Wireless Networks: Design and Optimization

OFDM-Based Broadband Wireless Networks: Design and Optimization

How to Cite

Liu, H. and Li, G. (2005) OFDM Fundamentals, in OFDM-Based Broadband Wireless Networks: Design and Optimization, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471757195.ch2

Publication History

  1. Published Online: 21 MAR 2006
  2. Published Print: 23 SEP 2005

ISBN Information

Print ISBN: 9780471723462

Online ISBN: 9780471757191

SEARCH

Keywords:

  • OFDM;
  • channel fading;
  • cyclic prefix;
  • cyclic postfix;
  • virtual carriers

Summary

In this chapter we describe the challenges in broadband communications by characterizing the wireless fading channels. The statistical model of time- and frequency selective fading channels is presented. Based on a multi-carrier communication framework, we introduce the concept of OFDM and explain how channel fading can be mitigated with OFDM modulation. The canonical block diagram of an OFDM modem is described, along with implementation details, such as cyclic pre- and postfix, virtual carriers, and pulse shaping essential to a practical OFDM realization.