The Capacity Region of Frequency-Selective Gaussian Interference Channels Under Strong Interference

17 September 2007

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Communications

Vol. 55 (9) , 1812-1821
https://doi.org/10.1109/tcomm.2007.904406

Abstract

This paper presents the capacity region of frequency-selective Gaussian interference channels under the condition of strong interference, assuming an average power constraint per user. First, a frequency-selective Gaussian interference channel is modeled as a set of independent parallel memoryless Gaussian interference channels. Using nonfrequency selective results, the capacity region of frequency-selective Gaussian interference channels under strong interference is expressed mathematically. Exploiting structures inherent in the problem, a dual problem is constructed for each independent memoryless channel, in which both mathematical and numerical analysis are performed. Furthermore, three suboptimal methods are compared to the capacity-achieving coding and power allocation scheme. Iterative waterfilling, a suboptimal scheme, provides close-to-optimum performance and has a distributed coding and power allocation scheme, which are attractive in practice.

Keywords

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