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AuthorShahmohammadi, Mohammad
AuthorKoyluoglu, O. Ozan
AuthorKhattab, Tamer M. S.
AuthorEl Gamal, Hesham
Available date2022-11-01T09:01:31Z
Publication Date2011
Publication NameIEEE International Symposium on Information Theory - Proceedings
ResourceScopus
Resource2-s2.0-80054814407
URIhttp://dx.doi.org/10.1109/ISIT.2011.6033915
URIhttp://hdl.handle.net/10576/35685
AbstractCognitive broadcast channel, where two multiantenna transmitters communicate with their respective receivers, is considered. One of the transmitters is said to be cognitive (secondary) as it is assumed to know the messages of the other (primary) transmitter non-causally. The goal is to design cooperative schemes between the two transmitters, which impose only minimal changes to the primary broadcast channel (compared to the non-cognitive scenario). Towards this end, an achievable scheme is provided under which both intra cell and inter cell interferences at the primary receivers are aligned. The interference at the secondary receivers, on the other hand, is canceled by dirty paper coding. The corresponding achievable region and an outer bound region are provided in terms of the degrees of freedom (DoF) metric. Special cases shows the optimality of the proposed scheme in the high SNR regime for those cases. We also illustrate the advantage of the cognitive cooperation over the non-cognitive system by proving that the achieved sum DoF is strictly larger than the non-cognitive case. 2011 IEEE.
Languageen
SubjectAchievable region
Broadcast channels
Cognitive cooperation
Cooperative schemes
Dirty paper coding
High SNR
Intercell interference
Multi-antenna transmitters
Optimality
Outer bounds
Broadcasting
Cognitive systems
Information theory
Mechanics
Transmitters
Signal receivers
TitleOn the degrees of freedom of the cognitive broadcast channel
TypeConference Paper
Pagination204-208
dc.accessType Abstract Only


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