Patent ID: 8351320

Claim:
An apparatus for transmitting a pilot in a wireless communication system, the apparatus comprising: a pilot generating unit configured to generate the pilot; a transmission circuitry configured to transmit the pilot and a radio signal; and a processor coupled to the pilot generating unit and configured to: generate interlaced pilot patterns; select one of a plurality of pilot pattern sets, an index of the selected pilot pattern set being determined according to the following equation: p k =floor( k,c/i ), where p k is the index of the selected pilot pattern set, k is a cell identifier (ID), c is a total number of cell IDs, i is a number of the plurality of pilot pattern sets, and floor(k,c/i) is a maximum integer smaller than a quotient obtained by dividing k by c/i; select one of a plurality of stream sets within the selected pilot pattern set, an index of the selected stream being determined according to the following equation: s n =mod( n,j ), where s n is the index of the selected stream set, n is the cell ID, j is a number of the plurality of stream sets, and mod(n,j) is a remainder obtained by dividing n by j; and map the generated pilot to a resource element based on a selected pilot pattern among the interlaced pilot patterns, the selected pilot pattern corresponding to the selected pilot pattern set and the selected stream set.