Author(s): Shyamala R
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 09 , September - 2017
Orthogonal frequency division Multiplexing (OFDM) & MIMO are the important strategies in fourth technology long term development. Compared in accordance, with Frequency Division Multiplexing (FDM) lifetime, more than one carrier is used because it affords greater tribune regarding spectral efficiency. In OFDM systems, due to loss of orthogonality between subcarriers, there is ICI (Inter Carrier Interference) and IS I(Inter Symbol Interference). To solve these problems, cyclic prefixing (CP) is required. But here the disadvantage is that, CP makes use of 20% of the available bandwidth. So a solution to this is wavelet based OFDM. A discrete Wavelet transform (DWT) based OFDM may be suggested to succeed in providing good orthogonality. CP is not required in wavelet based OFDM. In this paper, the performance of wavelet based OFDM system is studied and compared with the performance of DFT based OFDM system. With the aid of wavelet based OFDM better orthogonality is obtained. BER is also boosted. BER versus SNR is plotted for QPSK, 16-QAM and 64-QAM.
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