Patent ID: 7729237

Claim:
A method of transmitting a reference signal in a wireless communication system, the method comprising: generating a reference signal sequence which is defined by r l , n s ⁡ ( m ) = 1 2 ⁢ ( 1 - 2 · c ⁡ ( 2 ⁢ ⁢ m ) ) + j ⁢ 1 2 ⁢ ( 1 - 2 · c ⁡ ( 2 ⁢ ⁢ m + 1 ) ) , ⁢ m = 0 , 1 , … ⁢ , 2 ⁢ N RB max , DL - 1 where n s is a slot number within a radio frame, l is an orthogonal frequency division multiplexing (OFDM) symbol number within a slot and N RB max,DL is a maximum number of resource blocks (RBs), and c(2m) and c(2m+1) is defined by a pseudo-random sequence c(i), where i=0, 1, . . . , M max -1, and M max is a length of the pseudo-random sequence c(i), wherein the pseudo-random sequence c(i) is generated by a gold sequence generator which is initialized with initial values obtained by using (2 N ID cell +1), where N ID cell is a cell identifier; mapping a portion or entirety of the reference signal sequence to at least one RB; and transmitting a reference signal in the at least one RB.