Matthew C. Valenti

The basic idea behind cooperative communications is to allow groups of radios to collaborate in the transmission of data.  This can be thought of as creating a virtual antenna array, whereby each terminal donates its own antenna or antennas to form a large array comprised of many antennas.  See the presentation given at Hughes Network Systems.  We have developed a hybrid-ARQ-based approach to cooperative diversity [J8, J11], whereby the ARQ retransmissions could come from a relay rather than from the original transmitter.  In [J12], we have investigated asynchronous cooperative diversity systems; i.e., systems that are tolerant of a relative delay among cooperative transmissions. In [B3], we give a tutorial introduction to distributed space-time codes.  More recently, I have been considering cooperative cellular systems.  In our 2013 Globecom paper [C82], we consider a Coordinated Multipoint (CoMP) system that combines the downlink transmissions from multiple base stations.  This work builds on our earlier work [J40, C5] involving the combination of uplink transmissions across multiple base stations.