Channel estimation for interference mitigation in millimeter-wave multi-cell beamspace MIMO systems

Abstract

This paper deals with the inter-cell interference (ICI) mitigation in the channel estimation process of millimeter-wave multi-cell beamspace multiple-input multiple-output systems. The known channel estimation approaches cannot distinguish the ICI channels and the in-cell channels. In contrast, the in-cell channels and the ICI channels are estimated together and distinguished with the beam information in this paper. In addition, the beamspace channels are estimated with small error by utilizing the asymptotic property of the beamspace channels. As a result, the ICI can be efficiently suppressed. Performance analysis and numerical results show that the proposed approach outperforms the existing channel estimation approaches.