Generalized degrees of freedom of the symmetric K-user interference channel with feedback

Soheil Mohajer; Ravi Tandon; H. Vincent Poor

doi:10.1109/ISIT.2012.6284139

Generalized degrees of freedom of the symmetric K-user interference channel with feedback

Soheil Mohajer, Ravi Tandon, H. Vincent Poor

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Scopus citations

Abstract

The symmetric K user interference channel with fully connected topology is considered, in which (a) each receiver suffers interference from all other K - 1 transmitters, and (b) each transmitter has causal and noiseless feedback from its respective receiver. The number of generalized degrees of freedom (GDoF) is characterized in terms of α, where the interference-to-noise ratio (INR) is given by INR = SNR ^α. It is shown that the number of per-user GDoF of this network is the same as that of the 2-user interference channel with feedback, except for α = 1, for which existence of feedback does not help in terms of GDoF. The coding scheme proposed for this network, termed cooperative interference alignment, is based on two key ingredients, namely, interference alignment and interference decoding.

Original language	English (US)
Title of host publication	2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012
Pages	3125-3129
Number of pages	5
DOIs	https://doi.org/10.1109/ISIT.2012.6284139
State	Published - Oct 22 2012
Event	2012 IEEE International Symposium on Information Theory, ISIT 2012 - Cambridge, MA, United States Duration: Jul 1 2012 → Jul 6 2012

Publication series

Name	IEEE International Symposium on Information Theory - Proceedings

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Other	2012 IEEE International Symposium on Information Theory, ISIT 2012
Country/Territory	United States
City	Cambridge, MA
Period	7/1/12 → 7/6/12

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10.1109/ISIT.2012.6284139

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Generalized degrees of freedom of the symmetric K-user interference channel with feedback. / Mohajer, Soheil; Tandon, Ravi; Poor, H. Vincent.
2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012. 2012. p. 3125-3129 6284139 (IEEE International Symposium on Information Theory - Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Mohajer, S, Tandon, R & Poor, HV 2012, Generalized degrees of freedom of the symmetric K-user interference channel with feedback. in 2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012., 6284139, IEEE International Symposium on Information Theory - Proceedings, pp. 3125-3129, 2012 IEEE International Symposium on Information Theory, ISIT 2012, Cambridge, MA, United States, 7/1/12. https://doi.org/10.1109/ISIT.2012.6284139

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N2 - The symmetric K user interference channel with fully connected topology is considered, in which (a) each receiver suffers interference from all other K - 1 transmitters, and (b) each transmitter has causal and noiseless feedback from its respective receiver. The number of generalized degrees of freedom (GDoF) is characterized in terms of α, where the interference-to-noise ratio (INR) is given by INR = SNR α. It is shown that the number of per-user GDoF of this network is the same as that of the 2-user interference channel with feedback, except for α = 1, for which existence of feedback does not help in terms of GDoF. The coding scheme proposed for this network, termed cooperative interference alignment, is based on two key ingredients, namely, interference alignment and interference decoding.

AB - The symmetric K user interference channel with fully connected topology is considered, in which (a) each receiver suffers interference from all other K - 1 transmitters, and (b) each transmitter has causal and noiseless feedback from its respective receiver. The number of generalized degrees of freedom (GDoF) is characterized in terms of α, where the interference-to-noise ratio (INR) is given by INR = SNR α. It is shown that the number of per-user GDoF of this network is the same as that of the 2-user interference channel with feedback, except for α = 1, for which existence of feedback does not help in terms of GDoF. The coding scheme proposed for this network, termed cooperative interference alignment, is based on two key ingredients, namely, interference alignment and interference decoding.

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Generalized degrees of freedom of the symmetric K-user interference channel with feedback

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