Cognitive Radio: An Information-Theoretic Perspective

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Cognitive Radio: An Information-Theoretic Perspective (2009)

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by Aleksandar Jovičić , Pramod Viswanath

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180 - 1 self

BibTeX

@MISC{Jovičić09cognitiveradio:,
    author = {Aleksandar Jovičić and Pramod Viswanath},
    title = {Cognitive Radio: An Information-Theoretic Perspective },
    year = {2009}
}

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Abstract

We consider a communication scenario in which the primary and the cognitive radios wish to communicate to different receivers, subject to mutual interference. In the model that we use, the cognitive radio has non-causal knowledge of the primary radio’s codeword. We characterize the largest rate at which the cognitive radio can reliably communicate under the constraint that (i) no rate degradation is created for the primary user, and (ii) the primary receiver uses a single-user decoder just as it would in the absence of the cognitive radio. The result holds in a “low interference ” regime in which the cognitive radio is closer to its receiver than to the primary receiver. In this regime, our results are subsumed by the results derived in a concurrent and independent work [24]. We also demonstrate that, in a “high interference ” regime, multi-user decoding at the primary receiver is optimal from the standpoint of maximal jointly achievable rates for the primary and cognitive users.

Keyphrases

cognitive radio org ab c additive non-gaussian noise channel primary receiver information-theoretic perspective rate degradation communication scenario high interference regime single-user decoder costa precoding wireless network mutual interference independent work spectral reuse primary user low interference regime cognitive user non-causal knowledge index term cognitive radio interference channel different receiver primary radio codeword achievable rate dirty-paper coding multi-user decoding

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