Low Complexity FFT/IFFT Processor Applied for OFDM Transmission System in Wireless Broadband Communication
Processors of Fast Fourier Transform (FFT) and its inverse transform IFFT are a key component in OFDM based wireless broadband communication systems. It is essential to develop a high-speed and low-power performance FFT/IFFT processor to meet the real time and low cost prerequisites in such communication systems. This paper gives the details of the development of efficient 256-points FFT/IFFT architecture to be used in OFDM system and which satisfies the specification of IEEE 802.16a standard. The 256-points FFT architecture consists of an optimized pipeline implementation of 16-point FFT core based on Radix-2 butterfly processor element.