Distributed Precoding in Multicell Multiantenna Systems With Data Sharing

Abstract:
In this paper, a precoding scheme for interference mitigation based only on local channel state information is proposed for downlink multicell multiantenna systems with joint transmission. The investigated scheme places interference components at the receivers coming from the different transmitters in predefined subspaces, so that they are completely or approximately cancelled. It is shown how in certain scenarios of practical interest this strategy exploits better the available degrees-of-freedom in the system, with very little or practically no additional coordination effort compared with the related results from the literature.