Symmetric feedback capacity of the Gaussian interference channel to within one bit

@article{Suh2009SymmetricFC,
  title={Symmetric feedback capacity of the Gaussian interference channel to within one bit},
  author={Changho Suh and David Tse},
  journal={2009 IEEE International Symposium on Information Theory},
  year={2009},
  pages={1609-1613}
}
We characterize the symmetric capacity of the two-user Gaussian interference channel with feedback to within 1 bit/s/Hz. The result makes use of a deterministic model to provide insights into the Gaussian channel. We derive a new outer bound to show that a proposed scheme can achieve the symmetric capacity to within one bit for all channel parameters. One consequence of the result is that feedback provides unbounded gain, i.e., the gain becomes arbitrarily large for certain channel parameters… CONTINUE READING
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