Allerton 2015 Paper Abstract


Paper ThC6.1

Vahid, Alireza (Duke University), Shomorony, Ilan (UC Berkeley), Calderbank, A. Robert (Duke University)

Informational Bottlenecks in Two-Unicast Wireless Networks with Delayed CSIT

Scheduled for presentation during the Regular Session "Information Theoretic Approaches in Wireless Communications II" (ThC6), Thursday, October 1, 2015, 13:30−13:50, Visitor Center

53rd Annual Allerton Conference on Communication, Control, and Computing, Sept 29-Oct 2, 2015, Allerton Park and Retreat Center, Monticello, IL, USA

This information is tentative and subject to change. Compiled on December 5, 2021

Keywords Information Theoretic Approaches in Wireless Communications, Information Theory, MIMO Systems


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 $mD_1 + D_2 leq m$. 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.



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