IFHT算法在无线高速OFDM调制解调器中的实现方案

Realization Scheme of IFHT Algorithm in the Wireless High Speed OFDM Modem

正交频分复用(OFDM)技术是一种可以有效抗无线信道多径衰落的多载波调制方式,具有较高的频谱利用率。运用快速哈特利变换(FHT)和其反向快速哈特利变换(IFHT)来实现OFDM调制解调可有效地降低系统运算的复杂性,提高系统的时效。由于FHT和IFHT算法的一致性,本文只对IFHT算法在无线高速调制解调器中的软、硬件实现方案进行了研究。

As a multicarrier modulation manner, OFDM （ Orthogonal Frequency Division Multiplexing ） technique can effectively resist the multipath fading of wireless channels and possesses a high useability of frequency spectrum. By using the FHT （Fast Hartley Transform） and IFHT （Inverse Fast Hartley Transform）, the OFDM system design can more effectively reduce the computational complexity and time consumption than FFT （ Fast Fourier Transform ） and IFFT（Inverse Fast Fourier Transform）. Because FHT coincides with IFHT in algorithm, this paper only proposes the realization scheme of the hardware and software of the IFHT in the wireless high speed modem.