constituting the rb therefore when one rb is included on a two dimensional plane res which are constituent elements of the rb may correspond to respective elements of the matrix this matrix may be used to generate input information mapped to the rb generally since an rs may be fixedly allocated two sc fdma symbols among sc fdma symbols of an rb a matrix corresponding to the rb may be an r u00d7 c u2212 2 matrix rather than an r u00d7 c matrix fig3 a to 3 c are views explaining a structure of an rb used in fig4 to 11 referring to fig3 a an rs is mapped to an u2018 rs symbol period u2019 comprised of u2018 rs symbol period 0 u2019 and u2018 rs symbol period 1 u2019 the rs symbol period 0 and the rs symbol period 1 may not be adjacent to each other an u2018 rs symbol period area u2019 defined in the u2018 rs symbol period u2019 will now be described the rs symbol period area includes 2 u00d7 r resource elements located in the rs symbol period the u2018 rs symbol period area u2019 is divided into u2018 rs symbol period area 0 u2019 and u2018 rs symbol period area 1 u2019 each of the rs.