DMBT系统中利用FWT快速实现信道估计

Fast channel estimation using FWT in DMB-T systems

根据PN码的结构特性,针对DMB-T系统多载波模式,本文提出了一种新的理论上与滑窗相关法等价的信道估计方法,利用FWT(快速沃尔什变换)实现快速多径捕获。通过干扰抵消进一步消除了径间干扰。该方法具有很强的抗多径效应和抗强窄带干扰的能力,将运算复杂度从传统滑动互相关法的N2降低到(N+1)log2(N+1)。

Based on the characteristics of pseudo-random code sequence, this paper proposes a new algorithm for channel estimation in DMB-T systems using FWT （Fast Walsh Transform）, which is equivalent to sliding window method theoretically on performance. Interference cancellation is also implemented to further reduce the interference between different paths. This new algorithm is highly resistant to multi-path effects and narrow-band interference, and reduces the computational complexity from N^2 of traditional method to （N ＋ 1） log2 （N ＋ 1）.