Adaptive modulation and coding for fading channels

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Scopus citations

Abstract

We discuss some recent results on adaptive modulation and coding for fading channels. The connection between these results and the corresponding Shannon capacity limits and optimal transmission strategies are also explored. We first describe our work on adaptive trellis and turbo-coded MQAM, for flat-fading channels, including the impact of channel estimation error and feedback delay. Next we consider frequency-selective fading channels. We show that multicarrier modulation with adaptive loading is optimal for finite block lengths. However, as the blocklength grows to infinity Shannon theory indicates that a forward/backward coding strategy is required. We discuss various methods to implement such an adaptive strategy and how the performance of these methods might differ from that of adaptive multicarrier modulation. Next we examine adaptive modulation techniques for simultaneous voice and data transmission. Specifically, we propose a simple transmission strategy that simultaneously meets the delay and BER requirements of voice while maximizing the data throughput. The connection between these results and previous results on outage (delay-limited) capacity are outlined, along with extensions of this technique to more general multimedia systems with different data rate, BER, and delay requirements. Finally, we discuss adaptive CDMA strategies for voice and data users in multiaccess fading channels.

Original languageEnglish (US)
Title of host publicationProceedings of the 1999 IEEE Information Theory and Communications Workshop
EditorsFrancis Swarts, Jacobus Swarts
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages24-26
Number of pages3
ISBN (Electronic)0780352688, 9780780352681
DOIs
StatePublished - 1999
Externally publishedYes
Event1999 IEEE Information Theory and Communications Workshop - Kruger National Park, South Africa
Duration: Jun 25 1999 → …

Publication series

NameProceedings of the 1999 IEEE Information Theory and Communications Workshop

Conference

Conference1999 IEEE Information Theory and Communications Workshop
CountrySouth Africa
CityKruger National Park
Period6/25/99 → …

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Signal Processing
  • Computational Theory and Mathematics
  • Software

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