Patent ID: 9083572
Filing Date: 2015-07-14
Classification: H04L

Abstract:
1. A channel estimation apparatus comprising: a time domain transformer for transforming received pilot subcarrier signals to time domain signals; a noise reducer for reducing noises of the time domain signals using multipath information of a channel; a frequency domain transformer for transforming the noise-reduced time domain signals to frequency domain signals; and a final channel estimator for estimating channel values of data subcarriers received using the frequency domain signals, wherein the noise reducer reduces the noise by verifying a multipath of the channel and multiplying a preset coefficient equal to or greater than 0 and less than 1 to the channel on which a signal is less than a threshold among the transformed time domain signals, and the multiplied channel corresponds to the verified multipath, wherein the final channel estimator comprises a Minimum Mean-Square Error (MMSE) estimator for estimating the channel value of the data subcarrier based on an MMSE technique which groups the pilot subcarriers into multiple sets of subcarriers and applies the MMSE technique in a unit of a subcarrier set, and wherein the MMSE estimator estimates the channel value using the following equation: where w