Abstract-In this correspondence, we show that the exact number of spatial degrees of freedom (DOF) for a two user nondegenerate (full rank channel matrices) multiple-input-multiple-output (MIMO) Gaussian interference channel with M ; M antennas at transmitters 1, 2 and N ; N antennas at the corresponding receivers, and perfect channel knowledge at all transmitters and receivers, is minfM + M ; N + N ; max(M ; N ); max(M ; N )g. A constructive achievability proof shows that zero forcing is sufficient to achieve all the available DOF on the two user MIMO interference channel. We also show through an example of a share-and-transmit scheme how the gains of transmitter cooperation may be entirely offset by the cost of enabling that cooperation so that the available DOF are not increased. Index Terms-Broadcast, degrees of freedom (DOF), interference, multiple-input-multiple-output (MIMO), multiple access, zero forcing.
Indeed, the DoF of the 2-user MIMO interference channel was completely characterized in REF .
Degrees of Freedom for the MIMO Interference Channel
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Computer Science