On the feedback capacity of the fully connected K-user interference channel

Soheil Mohajer, Ravi Tandon, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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 (GDoF) is characterized in terms of α, where the interference-to-noise ratio (INR) is given by INR= SNRα . It is shown that the per-user 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 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 SNR and INR are far apart from each other.

Original languageEnglish (US)
Article number6389777
Pages (from-to)2863-2881
Number of pages19
JournalIEEE Transactions on Information Theory
Issue number5
StatePublished - 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


  • Feedback capacity
  • interference alignment
  • interference channel


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