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Summary: Great Expectations: The Value of Spatial
Diversity in Wireless Networks
SUHAS N. DIGGAVI, MEMBER, IEEE, NAOFAL AL-DHAHIR, SENIOR MEMBER, IEEE,
A. STAMOULIS, MEMBER, IEEE, AND A. R. CALDERBANK, FELLOW, IEEE
Invited Paper
In this paper, the effect of spatial diversity on the throughput
and reliability of wireless networks is examined. Spatial diversity
is realized through multiple independently fading transmit/re-
ceive antenna paths in single-user communication and through
independently fading links in multiuser communication. Adopting
spatial diversity as a central theme, we start by studying its
information-theoretic foundations, then we illustrate its benefits
across the physical (signal transmission/coding and receiver signal
processing) and networking (resource allocation, routing, and
applications) layers. Throughout the paper, we discuss engineering
intuition and tradeoffs, emphasizing the strong interactions be-
tween the various network functionalities.
Keywords--Ad hoc networks, channel estimation, diversity,
fading channels, hybrid networks, information theory for wireless
communications, multiple-antenna communications, multiuser
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