WIMAX系统中可配置FFT/IFFT的设计与实现  

Design and Implementation of Configurable FFT/IFFT in WIMAX System

作　　者：刘德福[1] 雷天民[1] 马卓[1] 

机构地区：[1]西安电子科技大学技术物理学院,陕西西安710071

出　　处：《电子科技》2010年第3期17-19,共3页Electronic Science and Technology

摘　　要：针对WIMAX系统中变长子载波的特点,通过采用流水线乒乓结构,以基2、基4混合基实现了高速可配置的FFT/IFFT。将不同点数的FFT旋转因子统一存储,同时对RAM单元进行优化,节约了存储空间;此外对基4蝶形单元进行优化,减少了加法和乘法运算单元。仿真和综合结果表明,设计满足了WIMAX高速系统中不同带宽下FFT/IFFT的要求。A variable-point FFT/IFFT is proposed in consideration of the characteristics of the variable-length subcarrier in WIMAX system. A high speed and corffigurable FFT/IFFF 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.

关 键 词：正交频分复用 WIMAX 快速傅里叶变换/逆变换 

分 类 号：TN911.7[电子电信—通信与信息系统]