| OFDM/DMT中一种基于DIT-DHT的高效率FFT/IFFT结构 |
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| 引用本文： | 柯建东,刘文江,戎蒙恬.OFDM/DMT中一种基于DIT-DHT的高效率FFT/IFFT结构[J].上海交通大学学报,2007,41(5):755-758. |
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| 作者姓名： | 柯建东 刘文江 戎蒙恬 |
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| 作者单位： | 上海交通大学,芯片与系统设计中心,上海,200240 |
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| 摘 要： | 提出了一种基于按时间抽取(DIT)离散哈特莱变换(DHT)的快速傅里叶变换(FFT)结构,运算过程均为实数操作.与复数FFT相比,该结构可以节省1/2的RAM并且需要更少的乘法器和加法器.这种FFT/IFFT结构适用于ADSL/VDSL、DAB/DVB、WLAN及其他OFDM/DMT应用和实数FFT应用中.
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| 关 键 词： | 正交频分复用/离散多音 快速傅里叶变换 离散哈特莱变换 |
| 文章编号： | 1006-2467（2007）05-0755-04 |
| 收稿时间： | 2006-06-20 |
| 修稿时间： | 2006年6月20日 |
A High-Efficient DIT-DHT-Based FFT/IFFT Structure for OFDM/DMT |
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| KE Jian-dong,LIU Wen-jiang,RONG Meng-tian.A High-Efficient DIT-DHT-Based FFT/IFFT Structure for OFDM/DMT[J].Journal of Shanghai Jiaotong University,2007,41(5):755-758. |
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| Authors: | KE Jian-dong LIU Wen-jiang RONG Meng-tian |
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| Abstract: | In multi-carrier modulation of OFDM/DMT,the Fourier transform is real-valued FFT,and the IFFT is the inverse transform of real-valued FFT.For this character,the FFT/IFFT of OFDM/DMT can be highly optimized to reduce the needs of hardware.An FFT/IFFT structure based on radix-2 decimation-in-time discrete Hartley transform(DIT-DHT) was proposed.In this structure,the operations are all real-valued,and the requirements of RAM,multiplier and adder are highly reduced.This FFT/IFFT structure is very useful in ADSL/VDSL,DAB/DVB, WLAN,or other fields using OFDM/DMT or real-valued FFT. |
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| Keywords: | orthogonal frequency division multiplexing / discrete multi-tone(OFDM/DMT) fast Fourier transform(FFT) discrete Hartley transform(DHT) |
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