Shams Arefeen

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Performance Evaluation of OFDM System for Different Modulation Techniques on the basis of Bit Error Rate and Peak to Average Power Ratio

Communications on Applied Electronics, 2015

Orthogonal frequency division multiplexing (OFDM) is a form of digital modulation used in a wide ... more Orthogonal frequency division multiplexing (OFDM) is a form of digital modulation used in a wide array of communication systems. This paper presents a comprehensive performance analysis of orthogonal frequency division multiplexing system. We investigate the basic principle of OFDM system and through computer simulation we present the Bit error rate(BER) and peak-to-average power ratio(PAPR) of OFDM system for different modulation techniques.

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Performance Evaluation of OFDM System for Different Channel and Different Modulation Techniques Supervised By

by Shams Arefeen and Foysal Bin Wadud

The demand for high-speed mobile wireless communications is rapidly growing. Orthogonal Frequency... more The demand for high-speed mobile wireless communications is rapidly growing. Orthogonal Frequency Division Multiplexing (OFDM) technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems in the near future. An Orthogonal Frequency Division Multiplexing (OFDM) scheme offers high spectral efficiency and better resistance to fading environments. In OFDM the data is modulated using multiple numbers of sub-carriers that are orthogonal to each other because of which the problems associated with other modulation schemes such as Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI) is reduced. This paper deals with the analysis of OFDM System utilizing different modulation techniques over Rayleigh, Rician and Additive White Gaussian Noise (AWGN) fading environments with the use of pilot aided arrangement and finally the results are conveyed. The aim of this thesis is to provide practical solutions for OFDM communication system by showing its better performance on different channel using different modulation technique. We applied different channel like AWGN, Rayleigh and Rician over OFDM system. We analyzed the performance of OFDM system regarding different channel. We analyzed the performance and showed the most suitable channel for OFDM communication system. Moreover, we also applied different modulation scheme over OFDM system to show which modulation technique is more efficient for OFDM system. Here we used BPSK, QPSK, 16-QAM and 64-QAM modulation technique. From our experiment we found that, among AWGN & the fading channels (Rayleigh & Rician), AWGN channel has less BER and P(e) than others. So we can say that, for OFDM system, AWGN channel is most suitable. We also found that, in all environments BPSK shows better performance than QPSK, 16QAM & 64QAM. When modulation level increased, corresponding BER & Probability of error P(e) also increased.

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