Multiuser Transmission in Cellular Systems With Different Sector Configurations

This paper considers the downlink for multiuser systems with a multiple antenna base station site and non-cooperative single antenna mobile stations. Traditionally, the goal of the base station site setup is user separation. We compare different deployment setups with respect to their achievable performance for several possible transmission schemes. A shift in strategy from separated sectors to overlapping sectors is proposed. Here, multiuser preceding techniques like Tomlinson-Harashima preceding (THP) allow for the exploitation of the available diversity and therefore offer large gains compared to the traditional separated sectors approach.