An apparatus, a method, and a user device for channel estimation

The embodiment of the invention provides an apparatus, a method, and a user device for channel estimation. The apparatus for channel estimation comprises a preprocessing unit, an interference eliminating unit, and a channel estimating unit. Using a reference signal sequence generated in advance, the preprocessing unit performs demultiplexing and despreading processing on a received signal in order to extract superimposed initial channel response of a resource element occupied by the reference signal in a downlink transport layer. The interference eliminating unit performs interference elimination according to an interference eliminating matrix used for eliminating interlayer interference and the initial channel response information, and acquires channel response information of the resource element occupied by the reference signal which has suffered from interference elimination. Based on the channel response information of the resource element occupied by the reference signal which has suffered from interference elimination, the channel estimating unit estimates the channel response of the resource element of downlink transmission data. The apparatus is capable of eliminating the interlayer interference contained in the initial channel response of the reference signal, and increasing channel estimation accuracy and system performance.