Transmission with cyclic delay diversity and matrix precoding

摘要

In this invention, a plurality of modulation symbols x(i) are generated. The plurality of modulation symbols x(i) are mapped onto the subcarriers in at least one transmission layer of a transmission resource. The modulation symbols are then precoded by using a first matrix U, a matrix for cyclic delay diversity D(i) and a precoding matrix W(i) from a set of codewords from a certain codebook, to generate a plurality of precoded symbols y(i)=W(i)D(i)Ux(i). The precoding matrix is changed every a certain number of subcarriers. Finally, the precoded symbols are transmitted via a plurality of transmission antennas.