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Motivated by the ongoing discussion of spectrum scarcity, this paper considers the K-user cognitive interference channel with K − 1 primary/licensed users and one cognitive/secondary user who has non-causal knowledge of the messages of all primary users. This message sharing mechanism is referred to as cognitive-only message sharing. For certain parameter regimes, the sum-capacity of the symmetric...
While a multi-letter limiting expression of the capacity region of the two-user Gaussian interference channel is known, capacity is generally considered to be open as this is not computable. Other computable capacity outer bounds are known to be achievable to within 1/2 bit using Gaussian inputs and joint decoding in the simplified Han and Kobayashi (single-letter) achievable rate region. This work...
This paper considers the asymptotic behavior of the outage probability of a two-source block-fading single-antenna Gaussian interference channel in the high-SNR regime by means of the diversity-multiplexing tradeoff. A general setting where the user rates and the average channel gains are not restricted to be symmetric is investigated. This asymmetric scenario allows to analyze networks with “mixed”...
We consider a Gaussian point-to-point secondary link which co-exists with a Gaussian point-to-point primary link, and is permitted to transmit within the primary user's interference margin — a simple but realistic channel model for underlay cognitive systems. Under this assumption, we are interested in quantifying the secondary user rate gains when the secondary users have knowledge of the primary...
Interference Channels with Generalized Feedback (IFC-GF) are a model for wireless communication systems with source cooperation. GF enables to enlarge the achievable rate region with respect to the non-cooperative IFC without requiring an increase in system resources. This paper develops an outer bound region on the capacity of general IFC-GF and then tighten it further for a class of semi-deterministic...
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