A multi-pair and two-way relaying system with amplify-and-forward in Ricean fading environments is considered,where the relay station is equipped with a large-scale multiple input multiple output(MIMO)antenna array.In order to efficiently reduce overhead for channel estimation and improve the spectral efficiency,firstly a linear transmission scheme only based on the line-of-sight(LoS)component is proposed.This scheme employs such a relaying process with low implement complexity that combines equal gain comb...