Link Layer Abstraction in MIMO-OFDM System

Link layer abstraction is crucial to the cross-layer simulation and design as the interface. EESM and MIESM are two kinds of algorithms which account for the instantaneous channel realization and other configurations and obtain the estimated packet error rate correspondingly. Enhanced versions of the algorithms with weighted training are brought out in this paper, which have shown great improvements compared to the original algorithms. Plenty of simulations have been made for verifications and the results show that the enhanced abstraction algorithms can reflect the performance of the link layer of MIMO-OFDM system with high precision for higher layer simulations.

I. Introduction

In system level simulations, we will focus on making transmission adaptations to optimize system performance and get better understanding of the user performance in various deployment scenarios. For complexity reasons system level evaluations should avoid the heavy physical-layer simulations and rely on simplified PRY-layer models that still must be accurate enough to capture the essential behavior. Therefore, the modeling approach of link layer is very important in the cross-layer design and simulations.