Massive SDMA with large scale antenna systems in a multi-cell environment

In this paper we investigate the downlink performance of `massive` spatial division multiple access for different precoding strategies when deploying a large scale antenna system. `Massive' means that the number of served MSs is increased up to the number of transmit antennas. As intuitive and shown in this work, then user grouping is required so we compare the case of non user grouping with a greedy sum rate maximization approach. Thereby, we answer the question if trends are transferable from the single-cell to the multi-cell scenario, considering MRT, SLNR and ZF precoding schemes. Throughout this work we assume perfect channel state information knowledge of all MSs at the serving BS and no delay or channel aging in the system. The focus in this work is on the system level perspective and evaluation is done by multi-cell simulations.