Optimizing Zero-Forcing Based Gain Allocation for Wireless Multiuser Networks

Authors

Celal Esli, Stefan Berger, and Armin Wittneben

Reference

IEEE International Conference on Communications (ICC), 2007, pp. 5825 - 5830 , June 2007.

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Abstract

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.

Keywords

cooperative relaying, ad-hoc networks, multiuser zero forcing relaying, diversity, fairness.


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