ANALISIS KINERJA SISTEM MIMO-OFDM PADA KANAL RAYLEIGH DAN AWGN DENGAN MODULASI QPSK

Abstract

OFDM (Orthogonal Frequency Division Multiplexing) is a transmission technique uses multiple frequency which each carrier is orthogonal. Each sub-carriers are modulated with a conventional modulation technique at a low symbol rate. This modulation can be modulated Phase Shift Keying (PSK). Problem of interference or multipath fading can be handled with MIMO (Multiple Input Multiple Output). This system uses a number of antenna transmitter and receiver to make the signal reflection as the main signal amplifier so that will support each other . This final project simulates performance of MIMO-OFDM with Alamouti STBC (Space Time Block Code) and MRC (Maximal Ratio Combining) with QPSK modulation at Rayleigh Fading Distribution Channel and AWGN (Additive White Gaussian Noise). The simulation results shows it need s Eb/No = 5dB to achieve BER = 10-5in both MIMO techniques. BER = 0 when Eb/No greater than 5 dB at STBC and BER = 0 when Eb/No greater than 5 dB at STBC . Better BER of MIMO STBC than MIMO MRC found on almost all values of Eb/No. Based on the simulation, performance of STBC-OFDM technique have advantages 1 dB from MRC-OFDM technique to achieve BER = 0. Keywords: OFDM, STBC, MIMO, BER