NDLI: Adaptive modulation in ad hoc DS/CDMA packet radio networks

Content Provider	IEEE Xplore Digital Library
Author	Souryal, M.R. Vojcic, B.R. Pickholtz, R.L.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. & Comput. Eng., George Washington Univ., DC, USA (Souryal, M.R.; Vojcic, B.R.; Pickholtz, R.L.)
Abstract	This paper investigates the benefit of adaptive modulation based on channel state information (CSI) in DS/CDMA multihop packet radio networks. By exploiting varying channel conditions on different links, adaptive modulation can be used in ad hoc networks to provide upper layers with higher capacity links over which to route traffic. Performance is evaluated in terms of the information efficiency, a new progress-related measure for multihop networks. Three types of adaptivity are analyzed, differing in the level of CSI available: (i) full knowledge of the SIR at the receiver, (ii) knowledge of only the signal attenuation due to fading, and (iii) knowledge of only the slow fading component of the signal attenuation. The effect on performance of imperfect channel information is also investigated. Sample results are given for interference-limited networks experiencing fourth-power path loss with distance, Rayleigh fading, and lognormal shadowing.
Starting Page	351
Ending Page	356
File Size	276455
Page Count	6
File Format	PDF
ISBN	0780379748
DOI	10.1109/GLOCOM.2003.1258260
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-12-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Packet radio networks Rayleigh channels Spread spectrum communication Attenuation Channel state information Ad hoc networks Telecommunication traffic Signal analysis Interference
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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