Channel Covariance Identification in FDD Massive MIMO Systems

Abstract

Channel estimation for Massive MIMO systems has drawn a lot of attention in the last years. A number of estimation methods rely on the knowledge of the channel covariance matrix to operate. However, this covariance is not known in practice, and it should be acquired. In this work, we investigate different techniques for covariance identification under the assumption of very short training sequences.

Keywords

• covariance identification
• Massive MIMO
• FDD