Heterogeneous broadcast channel: Spatial diversity or advanced receiver design

In this paper, we look at the simplest instance of heterogeneous broadcast channel (BC) where a multi-antenna transmitter base station (BS) is trying to communicate data to two user equipments (UEs), having the perfect CSIT about UE-1 and no CSIT about UE-2. We focus on UE-2 which is severely limited by the interference of UE-1. We consider the question whether additional spatial diversity or advanced receiver design at UE-2 is feasible for mitigating this interference. We investigate both the options and show that the rate of UE-2 gets significantly improved in both cases however hardware and RF design constraints may make the advanced receiver design solution preferable over spatial diversity solution.