Patent ID: 8055252

Claim:
A method of indicating a cell identifier in a signal to be transmitted in a cellular communication system, the method comprising. selecting one of a plurality, M, of codes, wherein each of the codes has a length N of code symbols, and wherein the selected code is associated with the cell identifier; and transmitting the selected code as a plurality, N, of reference symbols, wherein the M codes are orthogonal with one another over their length, N, of the code symbols and also over at least one subgroup of length L of the code symbols, wherein L<N, wherein: N=6; each of the M codes, R, is a two-dimensional orthogonal sequence distributed over frequencies and time, and is specified by: R = ( R 0 , 1 R 0 , 2 R 1 , 1 R 1 , 2 R 2 , 1 R 2 , 2 ) = [ ( 1 1 1 1 1 1 ) , ( 1 y x 1 y x ) , ( 1 x y 1 x y ) ] , where x=e j2π/3 and y=e j4π/3 .