| 块浮点FFT处理器的有限字长效应分析 |
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| 引用本文： | 乔树山,黑勇,吴斌,王晓琴.块浮点FFT处理器的有限字长效应分析[J].电子科技大学学报(社会科学版),2008(1). |
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| 作者姓名： | 乔树山 黑勇 吴斌 王晓琴 |
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| 作者单位： | 中国科学院微电子研究所 北京朝阳区100029 |
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| 摘 要： | 研究了基于基8算法的块浮点FFT处理器的有限字长效应问题,提出了一种基于理论统计分析的静态模型。在不考虑输入信号的量化误差和系数量化误差情况下,对基8单元和加权过程的误差进行了分析;给出了有限字长效应所造成的误差随着频率点数和级数的变化趋势。通过SPEED开发平台得到的硬件仿真结果验证了该方法估计字长效应的正确性,可以将其应用于工程分析。
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| 关 键 词： | FFT处理器 有限字长效应 基8单元 SPEED开发平台 |
Finite Word-Length Effects in Implementation of a Block Floating-Point FFT Processor |
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| QIAO Shu-shan,HEI Yong,WU Bin,WANG Xiao-qin.Finite Word-Length Effects in Implementation of a Block Floating-Point FFT Processor[J].Journal of University of Electronic Science and Technology of China(Social Sciences Edition),2008(1). |
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| Authors: | QIAO Shu-shan HEI Yong WU Bin WANG Xiao-qin |
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| Abstract: | This paper discusses issues of finite word-length effects in the block floating-point radix-8 FFT processor and presents a novel static model based on statistical analysis.When the input signal is white noise,the error caused by radix-8 unit and weight operation shows that the noise signal ratio(NSR) is proportional to r =log8N without the quantization error of input signal and coefficents,where N is the length of FFT.The paper also gives the error trend with the frequency point and transform stages.The simulation result from SPEED platform has a good consistent with the finite word-length effects analysis results.Consequently this scheme has better value in practice. |
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| Keywords: | FFT processor finite word-length effects radix-8 algorithm SPEED platform |
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