Multi-user Precoding-aided Spatial Modulation with Block Diagonalizaion

In this paper, we introduce a multi-user precoding-aided spatial modulation based on block diagonalization (BD). In contrast to conventional algorithms, our proposed technique eliminates the inter-user interference (IUI) though applying BD. As such, the proposed system avoids the inversion of either large-size matrices or a set of matrices, as compared to conventional techniques. In terms of system performance, the proposed technique can be used in under-determined and determined systems, with considerable improvements of the system performance in case of the under-determined systems due to the increased diversity gain.