Title :
An adaptive MQAM modulator for fixed wireless ATM networks
Author :
Mohammadi, Abbas ; Kumar, Surinder
Author_Institution :
EE Dept., Amirkabir Univ. of Technol., Tehran, Iran
Abstract :
This paper discusses various challenges to realize a fixed wireless ATM network and provides solutions to these challenges. The capacity allocation in wireless ATM, wireless link impact on ATM traffic, and optimum utilisation of the wireless network resources for a LOS wireless ATM link are studied. An adaptive MQAM modulator is introduced to provide an optimum solution to these problems. The modulator level is adjusted using a unique QoS metric in a wireless ATM 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-1 video traffic in a fixed wireless channel (Ricean channel) demonstrates the advantages of the proposed system
Keywords :
Rician channels; adaptive modulation; asynchronous transfer mode; quadrature amplitude modulation; quality of service; radio links; visual communication; ATM traffic; LOS wireless ATM link; QoS metric; QoS requirements; Ricean channel; VBR MPEG-1 video traffic; adaptive MQAM modulator; bandwidth demand; capacity allocation; fixed wireless ATM networks; fixed wireless channel; modified effective bandwidth; modulator level; optimum utilisation; outage conditions; wireless link impact; Asynchronous transfer mode; Bandwidth; Broadband communication; Design optimization; Loss measurement; Quality of service; Telecommunication traffic; Traffic control; Transmitters; Wireless networks;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937149
