Patent ID: 8837270

Claim:
A multiplexing method for multiplexing signals for a plurality of layers, the method comprising: storing a first orthogonal matrix and a second orthogonal matrix, each of which is a matrix with N rows and N columns where N is a natural number equal to or larger than 2, and the second orthogonal matrix being generated by cyclically shifting chips of particular rows of the first orthogonal matrix; and multiplying demodulation reference signals for respective layers included in a first layer group with chips of a corresponding row of the first orthogonal matrix, superposing and mapping the multiplying results in a same time frame of a first subcarrier group in a resource block, and multiplying demodulation reference signals for respective layers included in a second layer group with chips of a corresponding row of the second orthogonal matrix, superposing and mapping the multiplying results in a same time frame of a second subcarrier group which is different from the first subcarrier group in the resource block, each of the first layer group and the second layer group comprising N layers.