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- W2963238255 abstract "This paper studies the interference channel with a cognitive relay under delayed feedback. Three types of delayed feedback are studied: delayed channel state information at the transmitter, delayed output feedback, and delayed Shannon feedback. Outer bounds are derived for the degrees of freedom (DoF) region of the two-user multiple-input multiple-output interference channel with a cognitive relay with delayed feedback as well as without feedback. For the single-input single-output scenario, optimal schemes are proposed based on retrospective interference alignment. It is shown that while a cognitive relay without feedback cannot improve the sum-DoF in the two-user single-input single-output interference channel, delayed feedback in the same scenario can increase the sum-DoF to $4/3$ . For the multiple-input multiple-output case, achievable schemes are obtained via extensions of retrospective interference alignment, leading to the DoF regions that meet the respective upper bounds." @default.
- W2963238255 created "2019-07-30" @default.
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- W2963238255 date "2017-08-01" @default.
- W2963238255 modified "2023-09-24" @default.
- W2963238255 title "The Degrees of Freedom of the Interference Channel With a Cognitive Relay Under Delayed Feedback" @default.
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- W2963238255 doi "https://doi.org/10.1109/tit.2017.2708107" @default.
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