摘要
针对地面数字视频广播(DVB-T)系统中高速FFT处理器的设计要求,提出了一种新的基16/8混合基算法及其实现结构。采用单个基16/8复用的蝶形运算单元顺序处理,并通过减少乘法器数目,有效降低了硬件消耗;运算单元内部采用“基4+基4/2”级联流水线方式,大大加快了运算速度;此外,应用对称乒乓RAM结构提高了蝶算单元的连续运算能力;并且使用改进的块浮点防溢出机制,以保证运算精度。仿真和实现结果表明该设计具有良好的性能,完全满足实际应用要求。
A novel mixed radix-16/8 FFT algorithm and architecture are presented suitable for terrestrial digital video broadcasting （DVB-T） system.By using a single radix-16/8 butterfly processing element and reducing the number of multipliers,the proposed approach obtains significant hardware reduction.To achieve high speed processing,the ＂radix-4 ＋ radix-4/2＂ cascade pipeline architecture is designed in radix-16/8 butterfly unit.Furthermore,a symmetry ping-pang RAM structure is adopted to increase the continuous computing capability of the butterfly core.Computing precision is also enhanced through a modified block floating point anti-overflow scheme.Simulation and hardware implementation results show that the proposed method performs well and can meet the needs of the given application.
出处
《计算机工程与应用》
CSCD
北大核心
2006年第27期16-19,共4页
Computer Engineering and Applications
基金
上海市应用材料研究与发展基金资助项目(编号:AM0410)
关键词
快速傅立叶变换
蝶形运算单元
流水线
对称乒乓RAM结构
防溢出
Fast Fourier Transform,butterfly processing element,pipeline,symmetry ping-pang RAM strueture,antioverflow
