Patent ID: 8160177

Claim:
A method for transmission in a communication system, the method comprising: encoding a plurality of information bits to generate a plurality of coded bits; scrambling the plurality of coded bits to generate a plurality of scrambled bits; modulating the plurality of scrambled bits to generate a plurality of modulation symbols; mapping the plurality of modulation symbols onto subcarriers in at least one transmission layer of a transmission resource; and precoding the modulation symbols by using a precoding matrix for transmit diversity of which codewords of a codebook are changed every certain number of subcarriers; wherein the precoded symbols are established by: y ( i )= W ( i )· D ( i )· U·x ( i ) with: x(i) being a block of modulation symbols and x(i)=[x (0) (i) . . . x (v−1) (i)] T , where v is the number of transmission layers, U being a certain fixed matrix and the elements of U being established by U mn =e −j2πmn/v for m=0, 1, . . . , v−1, and n=0, 1,. . . , v−1, and D(i) being a diagonal matrix for supporting large delay cyclic delay diversity, where i is an integer.