Performance analysis of DWT based OFDM for WiMAX

In a limited allocation scenario of bandwidth, the accommodation of more number of users is very important for any service provider in today´s communication technology. To achieve this, Orthogonal Frequency Division Multiplexing (OFDM) is preferred. The existing OFDM is based on Fast Fourier Transforms (FFT) and Inverse Fast Fourier Transforms (IFFT) which imposes some restriction over the data rate. In order to overcome the limitation, OFDM with Discrete Wavelet Transform (DWT) and Inverse Discrete Wavelet Transform (IDWT) is proposed. The combination of DWT-IDWT is improving the performance of the Worldwide Interoperability for Microwave Access (WiMAX) technology in terms of Bit Error Rate (BER). For this, the OFDM model is developed in Simulink and the performance analysis of DWT-IDWT is compared with the existing FFT-IFFT based OFDM with the various modulation schemes. The simulation results using DWT-IDWT in OFDM schemes shows better than FFT-IFFT based OFDM schemes for WiMAX.