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High data rates are one of the most prevalent requirements in current mobilecommunications. To cover this and other high standards regarding performance,increasing coverage, capacity, and reliability, numerous works have proposedthe development of systems employing the combination of several techniques suchas Multiple Input Multiple Output (MIMO) wireless technologies with OrthogonalFrequency Division Multiplexing (OFDM) in the evolving 4G wirelesscommunications. Our proposed system is based on the 2x2 MIMO antenna technique,which is defined to enhance the performance of radio communication systems interms of capacity and spectral efficiency, and the OFDM technique, which can beimplemented using two types of sub-carrier mapping modes: Space-Time BlockCoding and Space Frequency Block Code. SFBC has been considered in ourdeveloped model. The main advantage of SFBC over STBC is that SFBC encodes twomodulated symbols over two subcarriers of the same OFDM symbol, whereas STBCencodes two modulated symbols over two subcarriers of the same OFDM symbol;thus, the coding is performed in the frequency domain. Our solution aims todemonstrate the performance analysis of the Space Frequency Block Codes scheme,increasing the Signal Noise Ratio (SNR) at the receiver and decreasing the BitError Rate (BER) through the use of 4 QAM, 16 QAM and 64QAM modulation over a2x2 MIMO channel for an LTE downlink transmission, in different channel radioenvironments. In this work, an analytical tool to evaluate the performance ofSFBC - Orthogonal Frequency Division Multiplexing, using two transmit antennasand two receive antennas has been implemented, and the analysis using theaverage SNR has been considered as a sufficient statistic to describe theperformance of SFBC in the 3GPP Long Term Evolution system over Multiple InputMultiple Output channels.

LTE SFBC MIMO Transmitter Modelling and Performance Evaluation