A method and base station for transmitting user equipment specific reference signals to a user equipment. The method includes applying a set of Walsh codes to the UE-RSs; and transmitting the Walsh code applied UE-RSs on resource block (RB) pairs allocated to the UE. The applying includes: applying the set of Walsh codes to the UE-RSs in a forward direction of a time domain on a first subcarrier of a first RB pair, in a reverse direction of the time domain on a second subcarrier of the first RB pair and in the forward direction of the time domain on a third subcarrier of the first RB pair so as to be a first UE-RS pattern.