Optimizing Zero-Forcing Based Gain Allocation for Wireless Multiuser Networks
Celal Esli, Stefan Berger, and Armin Wittneben
IEEE International Conference on Communications (ICC), 2007, pp. 5825 - 5830 , June 2007.
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We consider a wireless multiuser network where
a number of source/destination pairs communicate concurrently
over the same physical channel. A set of amplify-and-forward relay
nodes assist the communication by multiplying their received
signal with a complex gain factor before retransmission. We
propose and compare different strategies for finding the gain
factor for every relay terminal, motivated by the chosen figures
of merit: average sum rate, diversity, and fairness. A new and
practical definition of diversity is provided in the context of our
system model. For each strategy we investigate the provided gains
in terms of the figures of merit, and the trade-off between them.
An MMSE-based scheme and an asymptotic zero-forcing
scheme act as references to the proposed schemes.
cooperative relaying, ad-hoc networks, multiuser
zero forcing relaying, diversity, fairness.
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