Comparative Study on DWT-OFDM and FFT-OFDM Simulation Using Matlab Simulink
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2017 by IJETT Journal|
|Year of Publication : 2017|
|Authors : Manjunatha K, Mrs. Reshma M
|DOI : 10.14445/22315381/IJETT-V43P250|
Manjunatha K, Mrs. Reshma M " Comparative Study on DWT-OFDM and FFT-OFDM Simulation Using Matlab Simulink ", International Journal of Engineering Trends and Technology (IJETT), V43(5),302-304 January 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Orthogonal Frequency Division Multiplexing (OFDM) is a technique for transmitting multicarrier signals. In OFDM a stream of data is transmitted and they are orthogonal to one another. Designing an OFDM will reduces the multipath effect at receiving end, by dividing the wide-band frequencies into many narrow-band frequencies this dividing process is carried out to avoid the interference that is caused during multipath effect. Guard bands are used to separate the symbols present in the OFDM, this guard band separation will resist the multipath effects. The basic idea of using FFT-OFDM was explained by different authors . However, the applications of the OFDM are increasing rapidly in the fields of wired communication and wireless communication. High data rates are obtained using OFDM usually (FFT) Fast Fourier Transforms are used to get the orthogonal sub carriers. To overcome the disadvantages of FFT-OFDM, DWT-OFDM is considered. That is by replacing the DWT instead of FFT at the transmitting side and IDWT instead of IFFT at the receiving end . This paper describes about designing an OFDM system using Discrete Wavelet Transforms (DWT) and simulation results are obtained using MATLAB.
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OFDM, FFT, IFFT, DWT, IDWT.