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Virtual Antenna Array (VAA) systems (also known as cooperative communications, cooperative diversity, cooperative relaying or antenna sharing systems) are a new and recently proposed kind of (cooperative) spatial diversity, which have been receiving a significant interest in various communities as a means for improving the performance of both infrastructure - based and ad-hoc - based transmission systems operating over multipath fading channels. In particular, in antenna sharing systems the mobile radios share their single - antennas to create a distributed virtual antenna array through distributed transmissions and distributed signal processing operations.
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