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The main role of smart antennasis to mitigate Multiple Access Interference (MAI) by beamforming (Spatial filtering) operation. In addition to MAI, the performance of receivers is limited by fast fading. In this context, the authors propose in this paper a hybrid scheme of beamforming and diversity called HBF (Hierarchical BeamForming) and they propose a system model for the mathematical characterization of HBF for the performance evaluation. Moreover, they compare the performance of HBF receiver with Conventional BeamForming (CBF) one.
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