Sequential and Incremental Precoder Design for Joint Transmission Network MIMO Systems With Imperfect Backhaul

In this paper, the authors propose a sequential and incremental pre-coder design for downlink Joint Transmission (JT) network Multiple-Input - Multiple-Output (MIMO) systems with imperfect backhaul links. The objective of their design is to minimize the maximum of the sub-stream mean square errors, which dominates the average Bit Error Rate (BER) performance of the system. In the proposed scheme, they first optimize the pre-coder at the serving Base Station (BS) and then sequentially optimize the pre-coders of non-serving BSs in the JT set according to the descending order of their probabilities of participating in the JT.