Chapter 6. OFDMA Design Considerations

  1. Hui Liu and
  2. Guoqing Li

Published Online: 21 MAR 2006

DOI: 10.1002/0471757195.ch6

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) OFDMA Design Considerations, in OFDM-Based Broadband Wireless Networks: Design and Optimization, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/0471757195.ch6

Publication History

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

ISBN Information

Print ISBN: 9780471723462

Online ISBN: 9780471757191

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Keywords:

  • traffic channel configuration;
  • scalable OFDMA;
  • cross-layer design

Summary

In this chapter, we discuss some practical OFDMA system design issues. In particular, we investigate the problem of OFDMA traffic channel configuration, which involves both the PHY and MAC layers. The concept of cross layer optimization allows MAC and PHY layers to interact based on users' channel pattern and service models. The optimal traffic channel configurations for fixed and mobile applications are derived with reference to the IEEE 802.16e standard. Also described is the scalable OFDMA mode in IEEE 802.16e, where the FFT size scales with the bandwidth size. This scalability offers the advantages of easy implementation and high flexibility in handling user channel/traffic dynamics.