Selection of a Suitable Orthogonal Wavelet and Its Optimum Level of Decomposition for Noise Reduction in Digital Wireless Communication

Abstract: Wireless communication has become one of the fastest growing fields in today’s technological world. Growth in technology has led to unprecedented demand for high speed architectures for complex signal processing applications. In digital wireless communication system the reliability of Orthogonal Frequency Division Multiplexing (OFDM) is limited because of the time-varying nature of the channel. To avoid the effect of ICI(Inter Carrier Interference) cyclic prefix guard intervals were introduced before each block of parallel data symbols, but these guard intervals decreases the spectral efficiency of the OFDM system. To avoid the insertion of guard intervals wavelet based OFDM (OWDM) are used which gives a fine spectral containment of the signal over a wide range of the Bandwidth.

Keywords: OFDM, Wavelet, Decomposition, Reconstruction, Optimum level.