Link Abstraction for Multi-User MIMO in LTE using Interference-Aware Receiver

Most of the recent wireless communication systems are interference limited rather than noise limited. In the case of a very strong interferer the conventional assumption of the interference as Gaussian is extremely suboptimal. However optimal (capacity achieving) receivers utilize some prior knowledge about the interference to reach optimality. The link abstraction for such receiver structures is not studied well. We investigate how the conventional mutual information based link abstraction technique can be extended for the accurate and efficient link performance modeling for low complexity optimal receivers. So, in this paper we propose a mutual information based link abstraction methodology of an optimal, low complexity interference aware receiver for multi-user MIMO in the frame work of LTE. For the sake of comparison we performed abstraction of interference aware receiver with Exponential Effective SINR Mapping (EESM) method as well. We show with the help of results that our proposed method outperforms the EESM and provides the system level with more accurate link quality metric.