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Comparative performance analysis ofdft and dwt based of dm using different modulation techniques

Author: 
Richards, P.N., Prinu C. Philip, Ashok, A. and Jaiswal A. K.
Subject Area: 
Physical Sciences and Engineering
Abstract: 

Orthogonal Frequency Division Multiplexing (OFDM) is the important techniques in 4th Generation Long Term Evolution (LTE). Now the work is going on to for 5G. OFDM provides high reliability, high data rate, speed and robustness. But, there are some drawbacks in OFDM to minimize the efficiency of the communication system. One of the drawback is loss of Orthogonality in between the subcarriers there is intercarrier interference (ICI) and intersymbol interference (ISI) and this is over come by cyclic prefix. So, cyclic prefix will consume 20% of bandwidth. IN our proposed method, to overcome loss of bandwidth and to improve the performance of BER wavelet transform is used instead of Discrete Fourier Transform (DFT) and cyclic prefix. Hence, spectrum efficiency of the signal is increased so as to increase the performance of BER. In the future work, Stanford University Interim (SUI) channel is replaced by AWGN channel. In SUI modeling is done in the channel to improve the performance of the signal at different paths.

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