Journal of Communications and Networks

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Characterization of Adaptive Modulators in Fixed Wireless ATM Networks

  • Mohammadi, Abbas (Microwave and Wireless Communications Research Lab., Electrical Engineering Department, Amirkabir University of Technology(Tehran Polytechnic)) ;
  • Kumar, Surinder (Microwave Research Lab., Vcom Inc.)
  • Published : 2004.06.01
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Abstract

The various challenges to realize a fixed wireless ATM network are discussed and some solutions for these challenges are presented. In this paper, the capacity allocation in wireless ATM, the wireless link impact on ATM traffic, and the optimum utilization of the wireless network resonrces for a line of sight (LOS) winless ATM link are studied. An adaptive MQAM modulator is introduced to provide a suitable solution to these issues. The modulator level is adjusted using a unique QoS metric in a wireless network. The metric, termed modified effective bandwidth, takes into account the bandwidth demand, QoS requirements, and outage conditions of the wireless ATM link. A performance study using VBR MPEG-l video traffic in a fixed wireless channel (Ricean channel) demonstrates the advantages of the proposed system.

Keywords

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