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

Performance Analysis between Analog OFDM & Digital OFDM System

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Author(s)

Pravat Kanti Nath ¹ M. M. Rahman ¹ S. M. Abdur Rahim ¹ Md. Khalid Hossain ^2,* Md. Nasir Uddin Khan ¹ Salim Raja ³

1. Dept. of Applied Physics, Electronics & Communication Engineering, Islamic University, Bangladesh

2. Institute of Electronics, Atomic Energy Research Establishment, Savar, Dhaka, Bangladesh

3. Dept. of Electrical & Electronic Engineering, Hamdard University Bangladesh, Munshiganj, Bangladesh

* Corresponding author.

DOI: https://doi.org/10.5815/ijwmt.2016.04.08

Received: 1 Apr. 2016 / Revised: 3 May 2016 / Accepted: 7 Jun. 2016 / Published: 8 Jul. 2016

Index Terms

Analog OFDM System, Digital OFDM System, Orthogonal Subcarriers, Low Pass Filter

Abstract

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.

Cite This Paper

Pravat Kanti Nath, M. M. Rahman, S. M. Abdur Rahim, Md. Khalid Hossain, Md. Salim Raza, Md. Nasir Uddin Khan,"Performance Analysis between Analog OFDM & Digital OFDM System",International Journal of Wireless and Microwave Technologies(IJWMT), Vol.6, No.4, pp.84-100, 2016. DOI: 10.5815/ijwmt.2016.04.08

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