Patent ID: 7864876

Claim:
An apparatus for transmitting a space-time block code (STBC) in a multiple antenna system, having a number of transmit antennas, comprising: a symbol mapper for generating a number of symbols from the received binary data, upon receipt of binary data, each symbol having a number of bits; a space-time block encoder for generating an STBC by encoding the generated symbols; a differential encoding processor for differentially encoding the generated STBC through feedback and delay; and a distribution matrix processor for substituting the differentially encoded STBC into a distribution matrix, and outputting the differential STBC code of the distribution matrix to transmit antennas, wherein distribution matrix is set from among first matrices used for transmission of a real signal and second matrices used for transmission of a complex signal, depending on whether the symbols are real or complex and the number of the transmit antennas, and wherein the first matrices are defined by the following G matrices and the second matrices are defined by the following B matrices G 22 = [ a 1 a 2 - a 2 a 1 ] B 22 = [ a 1 a 2 - a 2 * a 1 * ] G 43 = [ a 1 a 2 a 3 - a 2 a 1 - a 4 - a 3 a 4 a 1 - a 4 - a 3 a 2 ] B 43 = [ a 1 a 2 a 3 - a 2 * a 1 * 0 - a 3 * 0 a 1 * 0 - a 3 * a 2 * ] G 44 = [ a 1 a 2 a 3 a 4 - a 2 a 1 - a 4 a 3 - a 3 a 4 a 1 - a 2 - a 4 - a 3 a 2 a 1 ] B 44 = [ a 1 a 2 a 3 0 - a 2 * a 1 * 0 a 3 - a 3 * 0 a 1 * - a 2 0 - a 3 * a 2 * a 1 ] , wherein at least one of the second matrices used for transmission of the complex signal is not square and the symbols are complex.