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.
Jafar and Fakhereddin REF determined the degrees of freedom of the two-user MIMO IC with an arbitrary number of antennas at each of the four terminals.
Degrees of Freedom for the MIMO Interference Channel
IEEE Transactions on Information Theory
IEEE Transactions on Information Theory
Computer Science