Math @ Duke

Publications [#326889] of Robert Calderbank
Papers Published
 Vahid, A; Shomorony, I; Calderbank, R, Informational bottlenecks in twounicast wireless networks with delayed CSIT,
2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
(April, 2016),
pp. 12561263, ISBN 9781509018239 [doi]
(last updated on 2018/03/20)
Abstract: © 2015 IEEE. We study the impact of delayed channel state information at the transmitters (CSIT) in twounicast wireless networks with a layered topology and arbitrary connectivity. We introduce a technique to obtain outer bounds to the degreesoffreedom (DoF) region through the new graphtheoretic 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 outerbound technique with new achievability schemes, we characterize the sum DoF of a class of twounicast wireless networks, which shows that, unlike in the case of instantaneous CSIT, the DoF of twounicast networks with delayed CSIT can take an infinite set of values.


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