Patent ID: 8599954

Claim:
A method for receiving data, the method comprising: repeatedly receiving, from four transmission antennas, a code division multiplexed symbol a that is generated by multiplexing a plurality of information bits using one of (i) a first code division multiplexing scheme and (ii) a second code division multiplexing scheme combined with a real and imaginary multiplexing scheme, wherein the code division multiplexed symbol a comprises four vectors a=[a 1 , . . . , a 4 ], wherein a first transmit diversity scheme and a second transmit diversity scheme are alternatively applied to alternate repetitions of the code division multiplexed symbol a before transmission from the four transmission antennas, wherein, for the first transmit diversity scheme, a transmit signal is 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 ] , and wherein, for the second transmit diversity scheme, a transmit signal is 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.