DESIGN OF RADIX-4 AND RADIX-8 BUTTERFLY UNITS USING VHDL
Jaishri M. Katekhaye, Amit Lamba, Vipin S. Bhure · Journal of Emerging Technologies and Innovative Research · 2015
Orthogonal Frequency Division Multiplexing (OFDM) is the promising solution for enhancing the data rates of wireless communication. Fast Fourier Transform (FFT) processor is one of the computationally complex modules of OFDM system. There are various algorithms available for designing the FFT processor viz., radix-2, radix-4, radix-8, split radix, mixed radix. Out of these, we have designed here butterfly units of radix-4 and radix-8. It is found that hardware required for single radix-8 butterfly is more as compare to the radix-4 butterfly. For simulation we used XILINX 14.2 ISE software and for coding we employed Very High Speed Integrated Circuit Hardware Description Language (VHDL).