关键词: 正交频分复用, WIMAX, 快速傅里叶变换/逆变换

Abstract:

A variablepoint FFT/IFFT is proposed in consideration of the characteristics of the variablelength subcarrier in WIMAX system.A high speed and configurable FFT/IFFT is designed by using the mixed radix with radix2,radix4 based on pipelined pingpong architecture.It saves storage space since all the twiddle factors are stored in the same space and RAM is optimized.Furthermore,radix4 butterfly processor is optimized for reducing adder and multiplying unit.The simulation results show that the design proposed meets the needs of FFT/IFFT for different bandwidth in highspeed WIMAX system.

Key words: OFDM;WIMAX;FFT/IFFT