Enforcing coordination in network MIMO with unequal CSIT

Degrees of Freedom (DoF) and Interference Alignment (IA) multi-cell multi-user: Interfering Broadcast Channel (IBC) Weighted Sum Rate (WSR) maximization and UL/DL duality

We consider mean and covariance Gaussian partial CSIT, and the special case of a (possibly location based) MIMO Ricean channel modelI. In this paper we focus on the optimization

In the following, we use a particular precoding algorithm to solve the optimization problem (16). However, our approach for the hierarchical CSI configuration can be adapted to

We derive a DoF outer bound for the two-user multiple-input multiple-output broadcast channel (MIMO BC) with good- quality delayed channel state information at the transmitter

Continuing with the symmetric single tier scenario above with a sin- gle stream/user and fixed receivers in cluster edge cells, the CSIT re- quired is only global for the cluster

This corresponds for instance to a situation where backhaul links pre-exist which are destined to routing the message (symbol) information of each user to the multiple base

This CSIT dissemination policy requires only the sharing of the user’s data symbols and of the CSI to within a neighborhood which does not increase with the size of the network..

If more than 12 antennas are available, each additional antenna is exploited by the heuristic algorithm to reduce the size of the CSIT allocation.. This algorithm brings a reduction