Cascaded Channel Estimation for Large Intelligent Metasurface Assisted Massive MIMO

In this letter, we consider the problem of channel estimation for large intelligent metasurface (LIM) assisted massive multiple-input multiple-output (MIMO) systems. The main challenge of this problem is that the LIM integrated with a large number of low-cost metamaterial antennas can only passively reflect the incident signals by certain phase shifts, and does not have any signal processing capability. To deal with this, we introduce a general framework for the estimation of the transmitter-LIM and LIM-receiver cascaded channel, and propose a two-stage algorithm that includes a sparse matrix factorization stage and a matrix completion stage. Simulation results illustrate that the proposed method can achieve…

• NN
  National Natural Science Foundation of China

  Award: 61801084
• NK
  National Key Research and Development Program of China

  Award: 2018YFB1801105