TY - GEN
T1 - Interference alignment and the generalized degrees of freedom of the X channel
AU - Huang, Chiachi
AU - Cadambe, Viveck R.
AU - Jafar, Syed A.
N1 - Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - We study the sum capacity of the X channel generalization of the symmetric 2-user interference channel. In this X channel, there are 4 independent messages, one from each transmitter to each receiver. We characterize the sum capacity of a deterministic version of this channel, and obtain the generalized degrees of freedom characterization for the Gaussian version. The regime where the X channel outperforms the underlying interference channel is explicitly identified, and an interesting interference alignment scheme based on a cyclic decomposition of the signal space is shown to be optimal in this regime.
AB - We study the sum capacity of the X channel generalization of the symmetric 2-user interference channel. In this X channel, there are 4 independent messages, one from each transmitter to each receiver. We characterize the sum capacity of a deterministic version of this channel, and obtain the generalized degrees of freedom characterization for the Gaussian version. The regime where the X channel outperforms the underlying interference channel is explicitly identified, and an interesting interference alignment scheme based on a cyclic decomposition of the signal space is shown to be optimal in this regime.
UR - http://www.scopus.com/inward/record.url?scp=70449499581&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70449499581&partnerID=8YFLogxK
U2 - 10.1109/ISIT.2009.5205582
DO - 10.1109/ISIT.2009.5205582
M3 - Conference contribution
AN - SCOPUS:70449499581
SN - 9781424443130
T3 - IEEE International Symposium on Information Theory - Proceedings
SP - 1929
EP - 1933
BT - 2009 IEEE International Symposium on Information Theory, ISIT 2009
T2 - 2009 IEEE International Symposium on Information Theory, ISIT 2009
Y2 - 28 June 2009 through 3 July 2009
ER -