Time Interference Alignment via Delay Offset for Long Delay Networks

Francesco Rossetto

Rohde & Schwarz
Munich, Germany

Abstract:

The potential of Time Interference Alignment is investigated, with particular reference to the attainable degrees of freedom. The K-user interference channel is considered, in which transmitters and receivers are placed randomly in a Euclidean space. A simplified model for long delay networks is introduced and the degrees of freedom for different cases (with and without transmitter delay coordination) are evaluated. It is shown how time interference alignment can provide more degrees of freedom than TDMA when the transmitters jointly coordinate their transmission delay and the number of pairs is K ≥ 5. Closed form expressions are derived for several cases of interest which provide insight and useful predictions. This work is concluded with an investigation of the achievable degrees of freedom for multi-satellite networks, where it is shown that the results obtained under several assumptions do predict accurately the degrees of freedom in a real setting.

Biography:

Francesco Rossetto (S’06, M’09) received the "laurea" (equivalent to MS) and the PhD in Telecommunications Engineering in 2005 and 2009, respectively, from the University of Padova, Padova, Italy. In 2004-2005 he studied electrical engineering at the University of California, San Diego, CA, USA, under a student exchange program. In 2008 he was on leave at the University of California, San Diego. Between 2009 and 2012 he has been with the DLR (German Aerospace Center) in Munich, Germany, working on multiuser schemes for satellite networks. Since 2012 he is with Rohde & Schwarz and is involved in the development of test equipment for mobile phones. His research interests include satellite and cellular communications and network coding.