Paper Details

The efficient use of data transmission is main problem in advanced type communication systems. Manytechnologies are used for higher data rates, in this process the OFDM system plays main role compared to thetechnologies. The OFDM system is one type of multicarrier modulation technique, in this system the original signal canbe divided into many number sub carriers. The same process is also done in other type of modulation techniques, but inOFDM system orthogonality condition is existed between the subcarriers. In OFDM system two types of interferenceswill be there, they are Inter Carrier Interference (ICI) and Inter Symbol Interference (ISI) and these are occurred due tothe orthogonality loss between the subcarriers, to overcome this problem cyclic prefix (CP) is used. CP is a guard bandin OFDM system that uses 20% of required subcarrier. Wavelet based OFDM system provides better orthogonalitybetween subcarriers. Signal to Noise Ratio (SNR) of the message signal improved by the wavelet transform techniques.Wavelet based OFDM system doesn’t require cyclic prefix, so bandwidth can’t be wasted. Compare the obtained resultsof 16QAM, 64QAM and 256 QAM with conventional DFT method. This is the one advantage to improve the utilization ofthe spectrum. OFDM system based on wavelet transform is proposed in the place of Discrete Fourier Transform (DFT)based OFDM in LTE. Comparing performance of Bit Error Rate (BER) in wavelet transform based techniques with DFTbased OFDM.

P. SUDHEER, K . APARNA, “Data Transmission through OFDM System by using Discrete Wavelet Transform Techniques”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 4, Issue 10, pp. 135-142, October 2017.