Design Of FFT Using ALU For Efficient OFDM Systems

In present scenario every process should be efficient and simple. Fast Fourier Transform (FFT) is an efficient algorithm to compute the N point DFT. The main focus of this paper is to design FFT using ALU which is used in receiver blocks of OFDM system. It has greater applications in signal and image processing, communication and instrumentation. But the design of FFT requires large number of additions and complex multiplications. To make this process rapid and simple, the FFT operation should be faster and power efficient. Hence, the 64-point FFT is designed using Arithmetic Logic Unit (ALU).It requires less power compared to the FFT designed using Decimation in Time (DIT) butterfly structure. The design is done in HDL and the synthesized results are analyzed using Xilinx ISE tool. KeywordsALU,DIT, FFT,IFFT,OFDM.