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.
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 decimationin-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.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2007年第5期755-758,共4页
Journal of Shanghai Jiaotong University
基金
上海市科委AM基金资助项目(2005AM0405)
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
orthogonal frequency division multiplexing / discrete multi-tone （OFDM/DMT）
fast Fourier transform （FFT）
discrete Hartley transform （DHT）
