OFDM系统中FFT算法的FPGA设计与实现  

Design and implementation of FFT algorithm by FPGA in OFDM system

作　　者：陈安乐[1] 国世超[1] 韩方景[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《信息技术》2009年第12期70-73,共4页Information Technology

摘　　要：针对FFT算法在OFDM系统中的应用,对一般的FFT算法进行比较分析,设计了一种便于FPGA硬件实现的基4 FFT算法结构。该实现结构的设计以简化电路结构,节省硬件资源,便于扩展维护为目的,以第一级运算为基础实现多级FFT运算,采用了电路复用技术,以一种新的数据排序方式实现正序输入,正序输出,简化旋转因子的排列,并对一些相关的关键技术进行了设计改进。本设计在ISE10.1平台采用VHDL语言编程实现,并通过了仿真验证。To the application of FFT in OFDM system, an efficient architecture of radix-4 DIF FFT algorithm is designed by comparing with general FFT algorithm. This design is aimed at predigesting the structure of electrocircuit, economizing resourse, and being easy to be extended and realized in FPGA. A technology of reusing is applied, a new method of sorting is used to realize beth input and output with positive, and some correlative key technologies are designed and improved. The design is described with VHDL language in ISE 10.1 software platform and is proved to be successful by the simulation and verification process.

关 键 词：OFDM FFT FPGA VHDL 

分 类 号：TN914.3[电子电信—通信与信息系统]