Reconfigurable intelligent surface (RIS) has been recently considered a key technology for future wireless communication systems. In order to achieve the optimal performance that RIS can provide, accurate channel information estimation is essential. H...
Reconfigurable intelligent surface (RIS) has been recently considered a key technology for future wireless communication systems. In order to achieve the optimal performance that RIS can provide, accurate channel information estimation is essential. However, existing RIS-based techniques did not consider RIS phase shift error. RIS inevitably has phase shift error due to hardware imperfection/defects or quantized phase shifts. In this paper, we propose a phase shift error estimation method with low computational complexity and high accuracy. We demonstrate efficiency of the proposed RIS phase shift error estimation method through simulation results and comparison with a benchmark method.