Patent ID: 8422354
Filing Date: 2013-04-16
Classification: H04L

Abstract:
1. A channel estimation apparatus that uses a data channel, comprising: a channel value extraction unit that extracts a first estimation value from a potential pilot signal received through a pilot channel and extracts a second estimation value from a potential data signal received through the data channel; a weight calculator that calculates a weight for determining a utilization ratio of the potential data signal in channel estimation from an error rate of the potential data signal; a channel estimator that estimates a final estimation value using the first estimation value and the second estimation value weighted by the weight calculated by the weight calculator; a gain adjustment unit that adjusts gains of the first and second estimation values, wherein the gain adjustment unit sums gain-adjusted first and second estimation values and outputs a sum of the gain-adjusted first and second estimation values to the channel estimator; and a hard decision unit that makes a hard decision on the potential data signal for removing a data component of the received potential data signal using a previous channel estimation value, wherein the channel value extraction unit outputs the first estimation value by multiplying a pilot signal with the received potential pilot signal and outputs the second estimation value by multiplying a data signal obtained as a result of the hard decision with the received potential data signal.