Patent ID: 8160172

Claim:
A method for transmitting data, the method comprising the steps of: multiplexing a plurality of information bits to be transmitted by using one of a first code division multiplexing scheme and a second code division multiplexing scheme combined with a real and imaginary multiplexing scheme, to generate a code division multiplexed symbol a comprising four vectors a=[a 1 , . . . , a 4 ]; and repeatedly transmitting the code division multiplexed symbol a by alternatively applying two transmit diversity schemes via four transmission antennas, with: in a first transmit diversity scheme, a transmit signal being established by: [ T 11 T 12 T 13 T 14 T 21 T 22 T 23 T 24 T 31 T 32 T 33 T 34 T 41 T 42 T 43 T 44 ] = [ a 1 a 2 a 3 a 4 0 0 0 0 - a 2 * a 1 * - a 4 * a 3 * 0 0 0 0 ] , where T ij represents the symbol transmitted on the i-th antenna and the j-th subcarrier, and i=1, 2, 3, 4, j=1, 2, 3, 4; and in a second transmit diversity scheme, a transmit signal being established by: [ T 11 T 12 T 13 T 14 T 21 T 22 T 23 T 24 T 31 T 32 T 33 T 34 T 41 T 42 T 43 T 44 ] = [ 0 0 0 0 a 1 a 2 a 3 a 4 0 0 0 0 - a 2 * a 1 * - a 4 * a 3 * ] where T ij represents the symbol transmitted on the i-th antenna and the j-th subcarrier, and i=1, 2, 3, 4, j=1, 2, 3, 4.