Ber Performance Analysis of Daubechies Wavelet In Dvb-T For Rayleigh Channel

In today’s scenario of communication technology, the demand for high speed data rate and bandwidth has increased to the extent, that it has become very difficult to manage the communication system. To increase the speed of operation, the data is transmitted parallel and for this purpose Orthogonal Frequency Division Multiplexing (OFDM) technique is used which also has high spectral containment required for wireless communication systems. The fundamental principle of OFDM is to decompose the high rate data stream (bandwidth W) into N parallel lower rate data streams or channels, one for each subcarrier. Each sub-carrier is modulated with a conventional modulation scheme (such as Quadrature Amplitude Modulation or Phase-Shift Keying) at a low symbol rate, maintaining total data rates similar to conventional singlecarrier modulation schemes in the same bandwidth. In OFDM, Fourier Transform (FT) is used as a modulation technique, but this concept creates an Inter Symbol Interference (ISI) because of the time dispersive nature of the channel. To reduce this effect, a Cyclic Prefix is used but this reduces its spectral efficiency too. Orthogonal Wavelet Division multiplexing (OWDM) scheme has been proposed in this paper for wireless (DVB-T) communication which outperforms OFDM and has a lower computational complexity and increased flexibility.