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.
出处
《电子科技》
2010年第3期17-19,共3页
Electronic Science and Technology
