On behalf of the organizing committee, we are very pleased to welcome you to the 11th Australian Communication Theory Workshop, held on the Australian National University campus, in Canberra. The technical program follows the well established format - all talks are by invitation and all submitted papers/abstracts are offered a poster slot to present recent results. We are very pleased to offer ... [Show full abstract] three research overviews by invited speakers Prof. Ping Koy Lam (Australian National University), Prof. Georgios Giannakis (University of Minnesota) and Prof. David Everitt, (NICTA) as well as 12 invited talks in 4 sessions across the two-and-a-half days of the workshop. We also have two half-day tutorials provided on the Tuesday. We would like to express our thanks to all speakers and presenters.