  A required feature for the next generation of wireless communication networks
will be the capability to serve simultaneously a large number of devices with
heterogeneous CSIT qualities and demands. In this paper, we consider the
overloaded MISO BC with two groups of CSIT qualities. We propose a transmission
scheme where degraded symbols are superimposed on top of spatially-multiplexed
symbols. The developed strategy allows to serve all users in a non-orthogonal
manner and the analysis shows an enhanced perfomance compared to existing
schemes. Moreover, optimality in a DoF sense is shown.
