When Does Output Feedback Enlarge the Capacity of the Interference Channel?
Résumé
In this paper, the benefits of channel-output feedback in the Gaussian interference channel (G-IC) are studied under the effect of additive Gaussian noise. Using a linear deterministic (LD) model, the signal to noise ratios (SNRs) in the feedback links beyond which feedback plays a significant role in terms of increasing the individual rates or the sum-rate are approximated. The relevance of this work lies on the fact that it identifies the feedback SNRs for which in any G-IC one of the following statements is true:
(a) feedback does not enlarge the capacity region;
(b) feedback enlarges the capacity region and the sum-rate is higher than the largest sum-rate without feedback; and
(c) feedback enlarges the capacity region but no significant improvement is observed in the sum-rate.
Origine | Fichiers produits par l'(les) auteur(s) |
---|