Patent ID: 8983007
Filing Date: 2015-03-17
Classification: H04L

Abstract:
1. A receiver apparatus comprising: a first frequency response estimator configured to calculate a first frequency response estimation value using a reference signal; a duration extractor configured to determine an estimation duration by extracting at least one duration from among a plurality of duration candidates into which a predetermined maximum delay time is divided; and a second frequency response estimator configured to calculate a second frequency response estimation value as a frequency response estimation value for demodulation using the first frequency response and the estimation duration, wherein the duration extractor comprises: an approximate channel impulse response estimating unit configured to calculate an approximate channel impulse response by frequency-time transforming the first frequency response estimation value; a path extraction unit configured to extract a predetermined number of paths from paths forming the approximate channel impulse response; and a corresponding duration determining unit configured to determine as the estimation duration a duration of the path extracted from the duration candidates including the delay time; and a test frequency response estimating unit configured to calculate a plurality of test frequency response estimation values using the first frequency response and each estimation duration output by the corresponding duration determining unit; a channel match value calculation unit configured to calculate a channel match value of each of the test frequency response estimation values using the first frequency response; and a comparator configured to select an estimation duration to be used by the second frequency response estimator in accordance with the channel match value.