S. M. Abdur Rahim

Work place: Dept. of Applied Physics, Electronics & Communication Engineering, Islamic University, Bangladesh

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Research Interests: Computational Engineering, Engineering

Biography

Mr. S. M. Abdur Rahim received his Bachelor’s and Master’s degree from the dept. of Applied Physics, Electronics & Communication Engineering of Islamic University, Kushtia7003, Bangladesh. Currently he is working as an assistant professor in the same department. His research interest includes materials science, nano materials, magnetic materials,
nanotechnology, wireless communication and wireless antenna design.

Author Articles
Performance Analysis between Analog OFDM & Digital OFDM System

By Pravat Kanti Nath M. M. Rahman S. M. Abdur Rahim Md. Khalid Hossain Md. Nasir Uddin Khan Salim Raja

DOI: https://doi.org/10.5815/ijwmt.2016.04.08, Pub. Date: 8 Jul. 2016

Orthogonal Frequency Division Multiplexing (OFDM) signaling has been widely used for high data rate transmission applications due to its high spectral efficiency and robustness to the frequency selective fading channels. One of the major drawbacks of the analog OFDM system is frequency shifting in every sub-carrier. That's why bit error rate increased in analog OFDM system. In this research, we want to solve the problem of the analog OFDM system by using IFFT circuit instead of the local oscillator. The IFFT circuit takes an input as frequency domain and provides output as a time domain signal for 4-QAM modulation. Basically IFFT circuit acts as a local oscillator in the analog OFDM system. The IFFT circuit only executes operation on a discrete frequency domain signal which is converted into a time domain signal by its. So no frequency shifting occurs in every sub-carrier in the digital OFDM system. As a result BER also decrease in digital OFDM system over the analog OFDM system. 

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