On power control and frequency reuse in the two user cognitive channel
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Sum capacity of the vector Gaussian broadcast channel and uplink-downlink duality
IEEE Transactions on Information Theory
Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
IEEE Transactions on Information Theory
Diversity-multiplexing tradeoff in multiple-access channels
IEEE Transactions on Information Theory
Sum capacity of Gaussian vector broadcast channels
IEEE Transactions on Information Theory
Capacity bounds for Cooperative diversity
IEEE Transactions on Information Theory
Achievable rates in cognitive radio channels
IEEE Transactions on Information Theory
Degrees of Freedom for the MIMO Interference Channel
IEEE Transactions on Information Theory
Capacity of Interference Channels With Partial Transmitter Cooperation
IEEE Transactions on Information Theory
Capacity of a Class of Cognitive Radio Channels: Interference Channels With Degraded Message Sets
IEEE Transactions on Information Theory
Degrees of Freedom Region of the MIMO X Channel
IEEE Transactions on Information Theory
Interference Alignment and Degrees of Freedom of the -User Interference Channel
IEEE Transactions on Information Theory
Cognitive radios with multiple antennas exploiting spatial opportunities
IEEE Transactions on Signal Processing
Hi-index | 754.84 |
In this paper, we explore the benefits, from the perspective of degrees of freedom (DOF), of user cooperation and cognitive message sharing for a two-user multiple-input multiple-output (MIMO) Gaussian interference channel with M1, M2 antennas at transmitters and N1, N2 antennas at receivers. For the case of user cooperation (including cooperation at transmitters only, at receivers only, and at transmitters as well as receivers), the sum DOF is min{M1 + M2, N1 + N2, max(M1, N2), max(M2, N1)}, which is the same as the sum DOF of the channel without cooperation. For the case of cognitive message sharing, the sum DOF is min{M1 + M2, N1 + N2,(1 - 1T2)((1 - 1R2) max(M1, N2) + 1R2(M1 + N2)) + 1T2(M1 + M2), (1 - 1T1) ((1 - 1R1) ċ max(M2, N1) + 1R1(M2 + N1)) + 1T1(M1 + M2)} where 1Ti = 1(0) when transmitter i is (is not) a cognitive transmitter and 1Ri is defined in the same fashion. Our results show that while both techniques may increase the sum capacity of the MIMO interference channel, only cognitive message sharing can increase the sum DOF. We also find that it may be more beneficial for a user to have a cognitive transmitter than to have a cognitive receiver.