Informational bottlenecks in two-unicast wireless networks with delayed CSIT
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Vahid, A; Shomorony, I; Calderbank, R
Published in: 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
April 4, 2016
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.
Duke Scholars
Published In
2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
DOI
ISBN
9781509018239
Publication Date
April 4, 2016
Start / End Page
1256 / 1263
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Vahid, A., Shomorony, I., & Calderbank, R. (2016). Informational bottlenecks in two-unicast wireless networks with delayed CSIT. In 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015 (pp. 1256–1263). https://doi.org/10.1109/ALLERTON.2015.7447152
Vahid, A., I. Shomorony, and R. Calderbank. “Informational bottlenecks in two-unicast wireless networks with delayed CSIT.” In 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015, 1256–63, 2016. https://doi.org/10.1109/ALLERTON.2015.7447152.
Vahid A, Shomorony I, Calderbank R. Informational bottlenecks in two-unicast wireless networks with delayed CSIT. In: 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015. 2016. p. 1256–63.
Vahid, A., et al. “Informational bottlenecks in two-unicast wireless networks with delayed CSIT.” 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015, 2016, pp. 1256–63. Scopus, doi:10.1109/ALLERTON.2015.7447152.
Vahid A, Shomorony I, Calderbank R. Informational bottlenecks in two-unicast wireless networks with delayed CSIT. 2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015. 2016. p. 1256–1263.
Published In
2015 53rd Annual Allerton Conference on Communication, Control, and Computing, Allerton 2015
DOI
ISBN
9781509018239
Publication Date
April 4, 2016
Start / End Page
1256 / 1263