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On the Optimality of Interference Decoding Schemes for K-User Gaussian Interference Channels

1
Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
2
Qualcomm India Pvt Limited, Hyderabad, Telangana 500081, India
*
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in IEEE ISIT 2019, Paris, France, 7–12 July 2019.
Entropy 2019, 21(11), 1053; https://doi.org/10.3390/e21111053
Received: 16 September 2019 / Revised: 23 October 2019 / Accepted: 24 October 2019 / Published: 28 October 2019
(This article belongs to the Special Issue Multiuser Information Theory II)
The sum capacity of the general K-user Gaussian Interference Channel (GIC) is known only when the channel coefficients are such that treating interference as noise (TIN) is optimal. The Han-Kobayashi (HK) scheme is an extensively studied coding scheme for the K-user interference channel (IC). Simple HK schemes are HK schemes with Gaussian signaling, no time sharing and no private-common power splitting. The class of simple HK (S-HK) schemes includes the TIN scheme and schemes that involve various levels of interference decoding and cancellation at each receiver. For the 2-user GIC, simple HK schemes are sufficient to achieve all known sum capacity results—sum capacity under mixed, strong and noisy interference conditions. We derive channel conditions under which simple HK schemes achieve sum capacity for general K-user Gaussian ICs. For the K-user GIC, these results generalize existing sum capacity results for the TIN scheme to the class of simple HK schemes. View Full-Text
Keywords: Gaussian Interference Channel; Han-Kobayashi scheme; treating interference as noise (TIN) Gaussian Interference Channel; Han-Kobayashi scheme; treating interference as noise (TIN)
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Chaluvadi, R.; Bolli, M.; Bhashyam, S. On the Optimality of Interference Decoding Schemes for K-User Gaussian Interference Channels
. Entropy 2019, 21, 1053.

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