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Summary: 1
Diversity Gain Regions for MIMO Fading
Broadcast and Multiple Access Channels
Lihua Weng, Student Member, IEEE, Achilleas Anastasopoulos, Member, IEEE,
and S. Sandeep Pradhan, Member, IEEE
Submitted: April 2005
Abstract
In wireless communication systems, users with heterogeneous information content such as data,
voice, and multimedia constrain the network by having different reliability requirements. In this paper
an information-theoretic framework is proposed to study communication systems which provide het-
erogeneous reliabilities for the users. This is done by defining individual probabilities of error for the
users in the network and obtaining their fundamental tradeoffs. Using this framework, a system can be
realized, which can provide a tradeoff of reliabilities among the users for a fixed vector of users' rates.
This adds a completely new dimension to the performance tradeoff in such networks, which is unique
to multi-terminal communication systems, and is beyond what is given by the conventional performance
versus rate tradeoff in single-user systems.
Although this is a very general concept and can be applied to any multi-terminal communication
system, in this paper we consider multiple-input multiple-output (MIMO) fading broadcast and multiple
access channels. In particular, we quantify the reliability tradeoff by introducing the notion of diversity
gain region (DGR), which specifies the set of diversity gain vectors that are simultaneously achievable
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