Performance Evaluation of Channel Equalizer Techniques in LTE-Advanced under Vehicular Environments

Abstract

The 3GPP LTE standard has developed into the most innovative wireless technology for future generations, capable of data transmission data at rates exceeding 1 Gbps. Improving total user communication performance highly depends on selecting the detection technique correctly, however, by choosing the proper mode of transmission. We analyzed channel equalization techniques Minimum Mean Square Error (MMSE) and Soft-Sphere Decoder (SSD), at the downlink of physical-layer of LTE‑A system under MIMO technology, besides studying the characteristics of utilizing various transmission schemes such-as Transmit Diversity (TxD) and Spatial Multiplexing (SM) (Open-Loop SM (OLSM) and Closed-Loop SM (CLSM)). For MIMO technology, the 4x2 configuration of transmitter-receiver antennas is preferred. To simulate and evaluate the system’s performance in throughput and Bit Error Rate (BER) used the LTE-A link level simulation program developed by “The Vienna University of Technology” which used in MATLAB, across various channel type including Vehicular-A (VehA) at a speed of 30km/s and Vehicular-B (VehB) at a speed of 120km/s.