Cooperative MIMO precoding for D2D underlay in cellular networks

As more advanced multi-antenna user equipment becomes widespread, multi-input-multi-output (MIMO) Device-to-Device (D2D) communications can provide substantial rate improvement when properly designed and implemented. This work studies MIMO precoding schemes for D2D and cellular downlink when D2D links reuse the channel resources of cellular downlink. Due to the co-channel interference resulting from shared resources, the selection of D2D precoder and cellular DL precoder become highly inter-dependent. We propose various precoding schemes in the distributed system where users only have their own channel information. These schemes enable cooperative precoding via signaling in the cellular context. We provide extensive simulations for different precoding schemes and illustrate their performance and overhead tradeoffs.