Patent ID: 7903582
Filing Date: 2011-03-08
Classification: H04L

Abstract:
1. An apparatus for estimating a channel in a wireless communication system, the apparatus comprising: a Channel Quality Indicator (CQI) memory unit configured to collect a predetermined number of channel information of a mobile station (MS); a CQI Difference (CQIDIF) memory unit configured to store a predetermined number of differences between consecutive pieces of the collected channel information of the MS; a CQI averaging unit configured to calculate an average value of the collected channel information of the MS; a first comparator configured to compare whether the average value of the collected channel information is included in a first threshold range; a CQIDIF variance unit configured to calculate a variance of the differences between consecutive pieces of the collected channel information of the MS if the average value of the channel information is included in the first threshold range; and a second comparator configured to compare the variance of the differences between consecutive pieces of the collected channel information with a second threshold to determine whether to perform at least one of regulating a modulation and coding scheme (MCS) and switching a Multiple Input Multiple Output (MIMO) operation mode.