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Network MIMO uses the coherent coordination of the transmitted signals from a cluster of bases to greatly reduce other-cell interference and improve spectral efficiency. Zeroforcing transmission is a simple and readily implemented form of Network MIMO that can give good performance gains over conventional systems. In this paper, the authors consider regularized ZF as a simple modification and explore the potential benefits for an indoor wireless system comprising 8 access points. The ZF solution is scaled to obey either sum-power or per-antenna power constraints. In the context of this simplified evaluation they find that regularization gives no gain in indoor systems, but the results hint that gain may be achieved in outdoor systems.
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