DocumentCode :
845734
Title :
Simple Rate Control for Fluctuating Channels in Ad Hoc Wireless Networks
Volume :
53
Issue :
6
fYear :
2005
fDate :
6/1/2005 12:00:00 AM
Firstpage :
1074
Lastpage :
1074
Abstract :
In the presence of channel fluctuation, rate adaptation is one way to maintain the quality of the link at the desired level. This is especially important in ad hoc wireless networks, where temporary channel fluctuation might create frequent needs for rerouting that would result in severe overhead and adversely affect the performance. We study an unusual method of passive rate adaptation in which some bits are dropped at the receiver end of a link. The symbol-error probability decreases as some bits are dropped. In terms of the mean-square distortion for a real-time analog signal, the tradeoff is between more reliable detection of fewer bits and less reliable detection of more bits. Our scheme achieves smaller mean-square distortion for a certain region of signal-to-noise ratio (SNR) values when compared with the original scheme without rate adaptation. Two examples, uniformly spaced, uncoded pulse amplitude modulation and quadrature amplitude modulation, are studied and compared for both a Gaussian channel and a Rayleigh fading channel. We conclude that our scheme has a larger fading channel than in a Gaussian channel. We also verify that our scheme has a larger applicable region of SNR values when a nonuniform constellation is used, since the important bits are given additional protection.
Keywords :
Amplitude modulation; Distortion; Fading; Fluctuations; Gaussian channels; Protection; Pulse modulation; Quadrature amplitude modulation; Signal to noise ratio; Wireless networks;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2005.849564
Filename :
1440678
Link To Document :
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