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Summary: Cross-layer Optimal Decision Policies for Spatial
Diversity Forwarding in Wireless Ad Hoc Networks
Jing Ai, Alhussein A. Abouzeid and Zhenzhen Ye
Electrical, Computer and Systems Engineering Department
Rensselaer Polytechnic Institute, Troy, New York 12180
Email: aij@rpi.edu, abouzeid@ecse.rpi.edu and yez2@rpi.edu
Abstract-- In order to adapt to the time-varying nature
of wireless channels, various channel-adaptive schemes
have been proposed to exploit inherent spatial diversity in
wireless ad hoc networks where there are usually alternate
forwarding nodes available at a given forwarding node.
However, existing schemes along this line are designed
based on heuristics, implying room for performance en-
hancement. Thereby, to seek a theoretical foundation for
improving spatial diversity gain, we formulate the selection
of the next-hop relay as a sequential decision problem
and derive a general "Optimal Stopping Relaying (OSR)"
framework for designing such spatial-diversity schemes. As
a particular example, assuming Rayleigh fading channels,
we implement an OSR strategy to optimize information
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