Computer Science – Information Theory
Scientific paper
2011-10-29
Computer Science
Information Theory
26 pages, 5 figures, submitted to IEEE Transactions on Information Theory
Scientific paper
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 (DoF) is characterized in terms of \alpha, where the interference-to-noise ratio (INR) is given by INR=SNR^\alpha. It is shown that the per-user DoF of this network is the same as that of the 2-user interference channel with feedback, except for \alpha=1, for which existence of feedback does not help in terms of DoF. 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 SNR and INR are far apart from each other.
Mohajer Soheil
Poor Harold Vincent
Tandon Ravi
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