FPGA-based implementation of orthogonal wavelet division multiplexing

Abstract

The method of multicarrier being developed at this time, namely Orthogonal Frequency Division Multiplexing (OFDM). But in its development, OFDM has several shortcomings. such as the high value of Peak to Average Power Ratio (PAPR) which causes the lower efficiency of power amplifier. An alternative method of multicarrier modulation is Orthogonal Wavelet Division Multiplexing (OWDM). OFDM uses the Inverse Fast Fourier Transform (IFFT) while OWDM uses the Inverse Discrete Wavelet Transform (IDWT). Our previous study showed that the bit error rate of OWDM is relatively equivalent to that of OFDM, while the PAPR value of OWDM is smaller than that of OFDM. This research implemented OWDM using VHDL language to encode each blocks of OWDM on a Field Programmable Gate Array (FPGA). FPGA has many advantages, one of them is the ability to handle the heavy computational load. The results of modeling and simulation were then implemented on the Field Programmable Gate Array (FPGA) board ATLYS Spartan-6 XC6SLX45 CSG324C. The results of this implementation indicated that the design of OWDM prototype algorithm using the Discrete Wavelet Transform (DWT) technique could be implemented on Spartan-6 board ATLYS XC6SLX45 CSG324C. The implementation results showed the resource usage of 13% on the FPGA board, with a minimum period of 75.668 ns and under the working frequency of Spartan-6 FPGA of 13.216 MHz.