In this PhD thesis defense, David Gregoratti presents his work, which aims  a distributed space-time block coding scheme that is particularly suitable for dynamic networks with possibly large and varying number of users. The code is based on random linear-dispersion matrices which are independently generated at each of the relays, regardless of the number of active terminals. In spite of its inherent randomness, the code is shown to present a deterministic behavior when its size is large enough but still within practical values.

For both amplify-and-forward and decode-and-forward relays, and under the assumption of frequency-flat block fading, the presented coding scheme improves the link spectral efficiency and provides diversity to the system.