Patent ID: 8170089
Filing Date: 2012-05-01
Classification: H04L

Abstract:
1. An apparatus for channel equalization in frequency domain, comprising: a channel estimating means for estimating a channel on received signal from outside; a channel matched filtering means for changing channel characteristic of the channel estimated by the channel estimating means and the received signal to channel characteristic to meet a condition required for noncausal filtering; a noncausal filtering means for changing the channel characteristic changed by the channel matched filtering means from nonminimum phase channel to minimum phase channel; a reverse channel calculating means for calculating a reverse of the channel changed by the noncausal filtering means in the frequency domain; and a frequency domain equalization means for performing channel equalization with respect to the channel changed by the noncausal filtering means in the frequency domain by using the reverse obtained by the reverse channel calculating means as coefficients of the frequency domain equalization apparatus, wherein the channel matched filtering means includes: a channel matched filter calculation unit for calculating channel matched filter coefficients based on the channel coefficient estimated by the channel estimating means; a first channel matched filter for changing channel characteristic of the channel estimated by the channel estimating means to channel characteristic to meet condition required for noncausal filtering by using the channel matched filter coefficients obtained by the channel matched filter calculation unit; and a second channel matched filter for changing channel characteristic of the received signal to channel characteristic to meet condition required for noncausal filtering by using the channel matched filter coefficients obtained by the channel matched filter calculation unit.