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In this article we propose to facilitate local peer-to-peer communication by a Device-to-Device (D2D) radio that operates as an underlay network to an IMT-Advanced cellular network. It is expected that local services may utilize mobile peer-to-peer communication instead of central server based communication for rich mul-timedia services. The main challenge(More)
—We propose a numerical method for finding pack-ings of MIMO semi-unitary precoding matrices in Grassman-nian manifolds with different metrics. The proposed expansion– compression algorithm (ECA) is practical, simple and produces efficient packings without the need for a sophisticated initial-ization. With chordal distance metric, the algorithm tends to(More)
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