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Information efficiency of multihop packet radio networks with channel-adaptive routing

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3 Author(s)
M. R. Souryal ; George Washington Univ., Washington, DC, USA ; B. R. Vojcic ; R. L. Pickholtz

This paper analyzes the benefit of adaptive routing based on knowledge of the channel state information in multihop, ad hoc wireless networks that use direct-sequence code-division multiple access. Cross-layer, channel-adaptive routing exploits the inherent spatial diversity of multihop wireless networks to select links with favorable channel conditions. The information efficiency, an extension of a previously used measure called expected progress, is used to evaluate performance. Results show that, combined with adaptive modulation, adaptive routing can improve performance in ad hoc networks by a factor of four to five in channels with Rayleigh fading and lognormal shadowing. The lack of position information in the routing decision would reduce performance by 25%. New approaches to channel-adaptive routing that enable rapid adaptivity to channel conditions are discussed.

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:23 ,  Issue: 1 )