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A Non-Orthogonal Unicast and Multicast (NOUM) transmission system allows amulticast stream intended to all receivers to be jointly transmitted withunicast streams in the same time-frequency resource blocks. While the capacityof the two-user multi-antenna NOUM with perfect Channel State Information atthe Transmitter (CSIT) is known and achieved by Dirty Paper Coding(DPC)-assisted NOUM with Superposition Coding (SC), the capacity and thecapacity-achieving strategy of the multi-antenna NOUM with partial CSIT remainunknown. In this work, we focus on the partial CSIT setting and make two majorcontributions. First, we show that linearly precoded Rate-Splitting (RS),relying on splitting unicast messages into common and private parts, encodingthe common parts together with the multicast message and linearly precoding atthe transmitter, can achieve larger rate regions than DPC-assisted NOUM withpartial CSIT. Second, we study Dirty Paper Coded Rate-Splitting (DPCRS), thatmarries RS and DPC. We show that the rate region of DPCRS-assisted NOUM isenlarged beyond that of conventional DPC-assisted NOUM and that of linearlyprecoded RS-assisted NOUM with partial CSIT.

Dirty Paper Coded Rate-Splitting for Non-Orthogonal Unicast and Multicast Transmission with Partial CSIT