Design and FPGA implementation of improved lifting scheme based DWT for OFDM systems

In this paper we present the design and FPGA implementation of improved Lifting Scheme based DWT for OFDM Systems. A generic Wavelet based DWT-OFDM for wireless communication is modeled in Simulink for various modulation schemes and wavelets, and analyzed for its BER performances and functionality and compared with Fourier based OFDM (FFT-OFDM) under AWGN Channel. For FPGA implementation of DWT-OFDM. Lifting Scheme architecture is used. Lifting based DWT architecture is better than convolution based DWT architecture in terms of area, power and speed performances. The proposed architecture is modelled using Verilog HDL and verified for its functionality in ModelSim and implemented targeting Virtex-5 FPGA development kit. The estimated frequency of operation of the design is 69.789 MHz, area is 20% of total available area and total power of 1.87907W.