Patent ID: 8565268

Claim:
A method for transmitting a UE (User Equipment) specific reference signal sequence at a base station in a wireless communication system, the method comprising: generating the UE specific reference signal sequence based on a pseudo-random sequence (c(n)); and transmitting the UE specific reference signal sequence to a UE, wherein the pseudo-random sequence is defined by the following equation 1, c ( n )=( x 1 ( n+N C )+ x 2 ( n+N C ))mod2 x 1 ( n +31)=( x 1 ( n+ 3)+ x 1 ( n ))mod2 x 2 ( n +31)=( x 2 ( n+ 3)+ x 2 ( n+ 2)+ x 2 ( n +1) +x 2 ( n ))mod2, where N c =1600 <equation 1> and a first m-sequence (x 1 (n)) is initialized with x 1 (0)=1, x 1 (n)=0, n=1, 2, . . . , 30, wherein a second m-sequence (x 2 (n))is initialized with k+(└n s /2┘+1)·(2N ID cell +1)·2 16 where n s is a slot number within a radio frame, N ID cell is a cell identity, and k is a scrambling identity.