Analysis of effective SINR mapping models for MIMO OFDM in LTE system

Abstract

The Link-to-System (L2S) interface concept plays an important role in the evaluation of wireless communication systems in terms of System Level Simulation (SLS). The L2S interface is an abstraction model to predict the Link Level Simulation (LLS) performance and transfers the prediction criterion to the SLS. L2S interface is based on a number of mapping models that predict and abstract the link level performance. It is called Effective SINR Mapping (ESM) model, which plays a major role in the L2S interface. A number of L2S interface models have been analyzed for Single Input Single Output (SISO) based on Orthogonal Frequency Division Multiplexing (OFDM) for various wireless communication systems such as the 3GPP Long Term Evolution [1] and WiMAX systems [2]. This paper is extending the analysis of L2S interface based on Multiple Input Multiple Output (MIMO OFDM) based on LTE system. Several models have been considered for the investigation such as Exponential ESM model (EESM), Mutual Information ESM model (MIESM), Capacity ESM model (CESM), and Logarithmic ESM model (LESM). The analysis has covered various MIMO transmission mode of LTE such as Transmit Diversity (TxD) and Spatial Multiplexing (SM). It has considered the different physical layer configuration for different Modulation and Coding Schemes MCS (from 1 to 15) and different bandwidth transmission mode such 1.4 MHz, 10 MHz, and 20 MHz. The results show that MIESM and EESM give a very high accuracy. Particularly, for small transmission bandwidth mode such as 1.4 MHz, the MIESM model outperform EESM model and gives an error range between ±0.2 and ±0.6 dB for SM and between ±0.1 and ±0.9 dB for TxD. However, the results decrease for large transmission bandwidth, in particular, with high modulation and coding scheme.