DESIGN AND IMPROVEMENT OF MULTIBAND OFDM-DWT SYSTEM OVER ULTRA WIDE BAND CHANNELS

Jassim, Ali

	DESIGN AND IMPROVEMENT OF MULTIBAND OFDM-DWT SYSTEM OVER ULTRA WIDE BAND CHANNELS
Al-Ma'mon College Journal
Article 1, Volume 0, Issue 28, 2018, Pages 304-316
Author
Ali Jassim
Abstract
The Ultra Wide Band (UWB) scheme faces main challenges in attaining wide coverage without affecting the scheme performance. In current generation communication scheme, Frequency Division Multiplexing (OFDM) is used to cater for increased data rate of wireless medium with good performance. Diversity methods play a significant role in attaining higher performance level under imperfect channel condition. This work studies the performance of Wavelet based OFDM in UWB schemes and a comparison is made with traditional fast Fourier transform (FFT) system based OFDM UWB scheme. Wavelet analysis has some robust benefits over Fourier analysis, as it permits a time-frequency domain operation, permitting optimal resolution and flexibility. Wavelets have been acceptably applied in almost all the fields of wireless communication schemes including OFDM which is a robust applicant for next generation of wireless communication scheme. Lately DWT (Discrete Wavelet Transform) is adopted in lieu of FFT (Fast Fourier Transform) for frequency transform. This paper suggests a DWT-OFDM over UWB scheme to attain improved performance in terms of signal to noise (SNR) and bit error rate (BER) for improved SV model based UWB channel. The performance of discrete wavelets are analyzed and compared with FFT based OFDM. The result indicates better BER performance of wavelet system than FFT system
Keywords
UWB; OFDM; Multiband; FFT; DWT

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