TY - GEN
T1 - Generalized degrees of freedom of the (noisy) X channel
AU - Huang, Chiachi
AU - Cadambe, Viveck R.
AU - Jafar, Syed A.
N1 - Copyright:
Copyright 2009 Elsevier B.V., All rights reserved.
PY - 2008
Y1 - 2008
N2 - We provide outer bounds on the capacity region of the two-user Gaussian X channel, i.e. a generalization of the twouser interference channel where there is an independent message from each transmitter to each receiver. We identify the conditions under which operating the X channel as the interference channel is optimal from the perspective of generalized degrees of freedom (GDOF) and sum capacity. Specifically, we first extend the bound on the sum rate of the interference channel obtained by Etkin, Tse, and Wang in [1] to the X channel. This bound provides insights into the operating regimes in which two channels have the same GDOF. We then extend the noisy interference capacity characterization previously obtained for the interference channel [2]-[4] to the X channel. Therefore, we show that the X channel associated with noisy (very weak) interference channel has the same sum capacity as the noisy interference channel.
AB - We provide outer bounds on the capacity region of the two-user Gaussian X channel, i.e. a generalization of the twouser interference channel where there is an independent message from each transmitter to each receiver. We identify the conditions under which operating the X channel as the interference channel is optimal from the perspective of generalized degrees of freedom (GDOF) and sum capacity. Specifically, we first extend the bound on the sum rate of the interference channel obtained by Etkin, Tse, and Wang in [1] to the X channel. This bound provides insights into the operating regimes in which two channels have the same GDOF. We then extend the noisy interference capacity characterization previously obtained for the interference channel [2]-[4] to the X channel. Therefore, we show that the X channel associated with noisy (very weak) interference channel has the same sum capacity as the noisy interference channel.
UR - http://www.scopus.com/inward/record.url?scp=70349667022&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349667022&partnerID=8YFLogxK
U2 - 10.1109/ACSSC.2008.5074685
DO - 10.1109/ACSSC.2008.5074685
M3 - Conference contribution
AN - SCOPUS:70349667022
SN - 9781424429417
T3 - Conference Record - Asilomar Conference on Signals, Systems and Computers
SP - 1565
EP - 1569
BT - 2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
T2 - 2008 42nd Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2008
Y2 - 26 October 2008 through 29 October 2008
ER -