【摘要】 在OFDM/DMT多载波调制中,FFT[1]为实数FFT(Real-Valued FFT),输入全部为实数,变换后的输出为偶函数即具有一定的共轭特性。相应地,IFFT为实数FFT的逆过程。实数FFT的实现与复数FFT具有很大的不同,文中提出了一种基于离散Hartley变换的实现方法,运算过程全部为实数过程,与复数FFT相比,所需的乘法、加法运算以及RAM的开销均大幅度降低。更多还原

【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.The realization of Real-valued FFT is much different from the Complex-valued FFT.In this paper,a discrete Hartley transform-based FFT/IFFT method is discussed.The arithmetic operations are all real-valued,and comparing with the complex-valued FFT,the requirements of RAM,multiplier and adder are highly reduced.更多还原