Title :
Retrospective interference alignment
Author :
Maleki, Hamed ; Jafar, Syed A. ; Shamai, Shlomo
Author_Institution :
EECS Dept., Univ. of California Irvine, Irvine, CA, USA
fDate :
July 31 2011-Aug. 5 2011
Abstract :
In this paper, we explore the possibility of achieving interference alignment with delayed CSIT when the transmitters are distributed. Our main contribution is an interference alignment scheme, called retrospective interference alignment, that is specialized to settings with distributed transmitters. With this scheme we show that the interference channel with 3 users with only delayed channel state information at the transmitters can achieve 9/8 DoF, while the the 2 user X channel is able to achieve 8/7 DoF. We also consider another setting where delayed channel output feedback is available to transmitters. In this setting the 3 user interference channel and the 2 user X channel are shown to achieve 6/5 and 4/3 DoF, respectively.
Keywords :
interference; radio networks; radio transmitters; 2 user X channel; CSIT; DoF; channel state information; distributed transmitters; retrospective interference alignment; wireless networks; Coherence; Interference channels; Noise; Output feedback; Receivers; Transmitters;
Conference_Titel :
Information Theory Proceedings (ISIT), 2011 IEEE International Symposium on
Conference_Location :
St. Petersburg
Print_ISBN :
978-1-4577-0596-0
Electronic_ISBN :
2157-8095
DOI :
10.1109/ISIT.2011.6034075