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The authors examine in this paper the benefits of beamforming techniques in ad hoc networks. They first devise a novel MAC paradigm for ad hoc networks when using these techniques in multipath fading environment. In such networks, the use of conventional directional antennas does not necessarily improve the system performance. On the other hand, the exploitation of the potential benefits of smart antenna systems and especially beamforming techniques needs a prior knowledge of the physical channel. Their proposition performs jointly channel estimation and radio resource sharing. They validate the fruitfulness of the proposed MAC and they evaluate the effects of the channel estimation on the network performance.
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