CHANNEL ESTIMATION CIRCUIT, CHANNEL ESTIMATION METHOD, AND RECEIVER

摘要

Disclosed is a channel estimation circuit that efficaciously removes a noise component in a time region and implements high precision channel estimation in channel estimation of a wireless communications system employing OFDM. The channel estimation circuit comprises estimation means (31, 32) for deriving estimated channel state information for each subcarrier from a received signal of each subcarrier that is obtained by converting OFDM-transmitted signal waves into frequency regions, using known and established reference signals that are multiplexed and transmitted together with data symbols; a first conversion means (33) for converting the estimated channel state information into a complex latency profile of a time region; a noise alleviation means (34) for alleviating noise by processing the complex latency profile: a second conversion means (35) for converting the complex latency profile processed by the noise alleviation means and obtaining estimated channel state information whereupon the noise is alleviated; and determination means (36, 37) for determining the status of the channel that has been estimated in the estimation means (31, 32). The noise alleviation means (34) mask processes a portion of the complex latency profile according to the state of the channel as determined by the determination means (36, 37).