Interference Suppression for MIMO Device to Device Pairs Underlaying Cellular Network

Device to device（D2D） communications may generate interference to the existing cellular networks.An interference suppression（IS） scheme is proposed in this paper.With this scheme,the threshold of D2D-pairs（D2D-Ps） communication was designed to reject the D2D-Ps which were not satisfied the threshold constraint,ensuring that the cellular users（CUs） had priority to use the spectrum resources.Then the interference from D2D-Ps at the receiver of CUs was eliminated first by precoding at the D2D transmitter and decoding at the CU＇s receiver.Next,the interference between D2D-Ps was suppressed by using interference alignment（IA）.Performance analysis shows that the priority of CUs using the spectrum resources has been guaranteed;the interference generated on the cellular links is well eliminated;the interference between D2D-Ps can also be suppressed.