Performance Analysis of DWT Based OFDM System using SRRC Filter in Mobile Wimax over Fading Environment

Abstract

Wavelets amid its capability to provide simultaneous information in both time and frequency domain, along with minimization of interference and improved bandwidth efficiency, is considered broadly as an efficient approach to replace fast Fourier transform (FFT) in the conventional orthogonal frequency division multiplexing (OFDM) systems. Efficient filter pulses are employed spectrally in such systems in order to mitigate the effect of inter-symbol interference (ISI) as well as satisfy the bandwidth limitations imposed by the multipath fading channels. In this paper, SRRC pulses are employed as transmit and receive filters to perform matched filtering in the wavelet based OFDM system of mobile worldwide interoperability for microwave access (Wimax) that facilitate to meet higher data rate demand along with reducing the probability of errors at the receiver. The physical layer performance of this simulated system is measured and compared in terms of bit error rate (BER) by varying signal to noise ratio (SNR) for different modulation techniques under wireless channel with realistic multipath fading and noisy conditions with path-loss model specifications in a semi-urban environment. The simulation outcome demonstrates significant improvement in BER which substantiates to enhance the performance of the physical layer in mobile Wimax under realistic environment conditions for various modulation schemes. Performance analysis by varying certain parameters of SRRC filter is also demonstrated to measure its comparative effectiveness. The simulation model is developed in MATLAB.

Cite this Article

Harpreet Kaur, Manoj Kumar, Ajay K. Sharma, Harjit P. Singh. Performance Analysis of DWT Based OFDM System using SRRC Filter in Mobile Wimax over Fading Environment. Journal of Communication Engineering & Systems. 2017; 7(1): 1–10p.