Experimental Performance Evaluation of Multiuser Zero Forcing Relaying in Indoor Scenarios


Stefan Berger and Armin Wittneben


IEEE Vehicular Technology Conference, VTC Spring 2005, May 2005.

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We consider a wireless ad hoc network with single antenna nodes under a two-hop relay traffic pattern. The gains of the amplify-and-forward relays are assigned such that the interference between different source/destination links is nulled (multiuser zero forcing relaying). This essentially realizes a distributed spatial multiplexing gain with single antenna nodes. The main contribution of this paper is the performance evaluation of this approach on the basis of multihop/multinode channel measurement at 5.25 GHz. As a specialty of our measurements, all links are measured concurrently. Consequently, in comparison to time-sequential measurements we are much less affected by phase noise and do not require quasi-static propagation environments. The measurements are described in detail and we give comprehensive results on the sum rate supported by multiuser zero forcing relaying in an 'open office' and a 'meeting room' indoor propagation scenario.


cooperative relaying, ad-hoc networks, spatial multiplexing, multihop/multinode channel measurements

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