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Abstract: In this paper, we explore the benefits, in the sense of total sum ratedegrees of freedom DOF, of cooperation and cognitive message sharing for atwo-user multiple-input-multiple-output MIMO Gaussian interference channelwith $M 1$, $M 2$ antennas at transmitters and $N 1$, $N 2$ antennas atreceivers. For the case of cooperation including cooperation at transmittersonly, at receivers only, and at transmitters as well as receivers, the DOF is$\min \{M 1+M 2, N 1+N 2, \maxM 1, N 2, \maxM 2, N 1\}$, which is the sameas the DOF of the channel without cooperation. For the case of cognitivemessage sharing, the DOF is $\min \{M 1+M 2, N 1+N 2, 1-1 {T2}1-1 {R2}\maxM 1, N 2 + 1 {R2} M 1+N 2, 1-1 {T1}1-1 {R1} \maxM 2, N 1 +1 {R1} M 2+N 1 \}$ where $1 {Ti} = 1$ $0$ when transmitter $i$ is is nota cognitive transmitter and $1 {Ri}$ is defined in the same fashion. Ourresults show that while both techniques may increase the sum rate capacity ofthe MIMO interference channel, only cognitive message sharing can increase theDOF. We also find that it may be more beneficial for a user to have a cognitivetransmitter than to have a cognitive receiver.



Author: Chiachi Huang, Syed A. Jafar

Source: https://arxiv.org/



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