Title :
Lattice coding and the generalized degrees of freedom of the interference channel with relay
Author :
Chaaban, Anas ; Sezgin, Aydin
Author_Institution :
Dept. of Commun. Syst., Ruhr-Univ. Bochum, Bochum, Germany
Abstract :
The generalized degrees of freedom (GDoF) of the symmetric two-user Gaussian interference relay channel (IRC) is studied. While it is known that the relay does not increase the DoF of the IC, this is not known for the more general GDoF. For the characterization of the GDoF, new sum-capacity upper bounds and lower bounds are derived. The lower bounds are obtained by a new scheme, which is based on functional decode-and-forward (FDF). The GDoF is characterized for the regime in which the source-relay link is weaker than the interference link, which constitutes half the overall space of channel parameters. It is shown that the relay can indeed increase the GDoF of the IRC and that it is achieved by FDF.
Keywords :
Gaussian channels; decode and forward communication; radiofrequency interference; FDF; GDoF; functional decode-and-forward; generalized degrees of freedom; interference channel; interference link; lattice coding; relay; sum-capacity lower bounds; sum-capacity upper bounds; symmetric two-user Gaussian interference relay channel; Decoding; Integrated circuits; Interference channels; Lattices; Receivers; Relays;
Conference_Titel :
Information Theory Proceedings (ISIT), 2012 IEEE International Symposium on
Conference_Location :
Cambridge, MA
Print_ISBN :
978-1-4673-2580-6
Electronic_ISBN :
2157-8095
DOI :
10.1109/ISIT.2012.6283515
