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Adaptive Modulation
and Scheduling over Fading Channels
Nilo Casimiro Ericsson
Globecom`99: Future Wireless Communication Systems
Rio de Janeiro, December 5-9, 1999 © 1999 IEEE
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Abstract:
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In future packet based wireless communication systems, transmission
in the downlink will often dominate the traffic load. High bit-rate
applications like WWW-browsing, file transfer, and full motion video
will impose strong requirements on the system capacity. An obstacle in
this context is the time-variability of the channel: For mobile users,
frequently occuring fading dips will cause unnecessary, and capacity
degrading, retransmissions.
In this paper we investigate the effect of adaptive modulation, along
with time-slot scheduling, involving several mobiles and one base
station.
We found that the bit error rate can be kept at an adjustable low level,
well suited for Forward Error Correction (FEC) codes. Moreover, the
more mobiles that share a frequency channel, the more efficiently the
scheduler uses the channel bandwidth.
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Related publications:
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Ph.D. Thesis
by Nilo Casimiro Ericsson, Oct. 2004.
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Licenciate Thesis by Nilo C. Ericsson.
VTC99-fall conference paper.
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Source:
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Postscript, 549K ;
Pdf, 115K
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