TY - GEN
T1 - Informational bottlenecks in two-unicast wireless networks with delayed CSIT
AU - Vahid, Alireza
AU - Shomorony, Ilan
AU - Calderbank, Robert
PY - 2016/4/4
Y1 - 2016/4/4
N2 - We study the impact of delayed channel state information at the transmitters (CSIT) in two-unicast wireless networks with a layered topology and arbitrary connectivity. We introduce a technique to obtain outer bounds to the degrees-of-freedom (DoF) region through the new graph-theoretic notion of bottleneck nodes. Such nodes act as informational bottlenecks only under the assumption of delayed CSIT, and imply asymmetric DoF bounds of the form mD1 + D2 ≤ m. Combining this outer-bound technique with new achievability schemes, we characterize the sum DoF of a class of two-unicast wireless networks, which shows that, unlike in the case of instantaneous CSIT, the DoF of two-unicast networks with delayed CSIT can take an infinite set of values.
AB - We study the impact of delayed channel state information at the transmitters (CSIT) in two-unicast wireless networks with a layered topology and arbitrary connectivity. We introduce a technique to obtain outer bounds to the degrees-of-freedom (DoF) region through the new graph-theoretic notion of bottleneck nodes. Such nodes act as informational bottlenecks only under the assumption of delayed CSIT, and imply asymmetric DoF bounds of the form mD1 + D2 ≤ m. Combining this outer-bound technique with new achievability schemes, we characterize the sum DoF of a class of two-unicast wireless networks, which shows that, unlike in the case of instantaneous CSIT, the DoF of two-unicast networks with delayed CSIT can take an infinite set of values.
UR - http://www.scopus.com/inward/record.url?scp=84969900693&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84969900693&partnerID=8YFLogxK
U2 - 10.1109/ALLERTON.2015.7447152
DO - 10.1109/ALLERTON.2015.7447152
M3 - Conference contribution
AN - SCOPUS:84969900693
T3 - 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
SP - 1256
EP - 1263
BT - 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
Y2 - 29 September 2015 through 2 October 2015
ER -