Analisa Kinerja Orthogonal Frequency Division Multiplexing Berbasis Perangkat Lunak

Abdillah, Kusuma and Moegiharto, Yoedy (2010) Analisa Kinerja Orthogonal Frequency Division Multiplexing Berbasis Perangkat Lunak. EEPIS Final Project.

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Abstract

There are many methods to solve the needs of channel communication system and the effects of multipath fading one of them is by using the Orthogonal Division Multiplexing (OFDM) system. OFDM system is the development of Frequency Division Multiplexing (FDM). The fundamental difference of OFDM and FDM system that is located on the frequency sub-carriers, the OFDM system is allowed to sub-carriernya frequency overlapping each other so that they can save bandwidth channel communication system, and increased channel capacity. OFDM system is not only overcome the channel capacity can be improved but also can overcome effects from multipath fading. In this final project is done a analyzing the performance of OFDMbased software. From the data simulation is obtained values of Bit Error Rate (BER) will increase as levels of modulation increase or the number of M-ary increase. OFDM with Quadrature Amplitude Modulation Modulation (QAM) has a good BER compared with OFDM with Phase Shift Keying (PSK). On 10 tap Rayleigh channel OFDM with 10-QAM modulation has 1 dB better than QPSK, OFDM with 8-QAM modulation has 3 dB better than the 8-PSK, OFDM with 16-QAM modulastion has 5 dB better than the 16 - PSK, and for OFDM with 256- QAM modulation has 15 dB better than 256-PSK. Keyword : OFDM, IFFT, FFT, Cylic Prefix, Rayleigh Fading

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