Skip to main content

On the Feedback Capacity of the Fully Connected $K$-User Interference Channel

Author(s): Mohajer, Soheil; Tandon, Ravi; Poor, H Vincent

To refer to this page use:
Abstract: The symmetric K -user interference channel with fully connected topology is considered, in which 1) each receiver suffers interference from all other ( K -1) transmitters, and 2) each transmitter has causal and noiseless feedback from its respective receiver. The number of generalized degrees of freedom (\ssr GDoF ) is characterized in terms of α, where the interference-to-noise ratio (\ssr INR ) is given by \ssr INR = \ssr SNR α . It is shown that the per-user \ssr GDoF of this network is the same as that of the two-user interference channel with feedback, except for α = 1, for which existence of feedback does not help in terms of \ssr GDoF . The coding scheme proposed for this network, termed cooperative interference alignment, is based on two key ingredients, namely, interference alignment and interference decoding. Moreover, an approximate characterization is provided for the symmetric feedback capacity of the network, when the \ssr SNR and \ssr INR are far apart from each other.
Publication Date: 20-Dec-2012
Citation: Mohajer, Soheil, Tandon, Ravi, Poor, H Vincent. (2013). On the Feedback Capacity of the Fully Connected $K$-User Interference Channel. IEEE Transactions on Information Theory, 59 (5), 2863 - 2881. doi:10.1109/tit.2012.2235524
DOI: doi:10.1109/tit.2012.2235524
ISSN: 0018-9448
EISSN: 1557-9654
Pages: 2863 - 2881
Type of Material: Journal Article
Journal/Proceeding Title: IEEE Transactions on Information Theory
Version: Author's manuscript

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.