Designs of Finite Resolution IRS-aided MIMO Multiuser Communications Based on SZFDPC

A novel design of MIMO downlink communications that is assisted by modern intelligent reflecting surfaces (IRS) is proposed in this paper. The new design employs successive zero-forcing dirty paper coding at base station and allows multiple receive antennas to be used at users, making it much more realistic than existing works, which are applicable only to cases of single receive antenna. Furthermore, the new design requires IRS elements with only finite phase resolution and is much more practical for implementation. Simulation results show that the proposed design can significantly improve the performance of IRS-aided downlink communications. In particular, for the classical scenario of single receive antenna at users, our design, using only a QPSK phases for IRS elements, increases by more than 200-540% the energy efficiency of several existing works that assume IRS elements with infinite resolution for phases.