Patent ID: 7564915

Claim:
A method for coding a pseudo orthogonal space-time block code in a transmitter using 4 transmission antennas, the method comprising the steps of: upon receiving information symbol streams x 1 x 2 x 3 x 4 to be transmitted, parallel-converting the received information symbol streams x 1 x 2 x 3 x 4 into x 1 ,x 2 ,x 3 ,x 4 ; and coding the parallel-converted information symbol streams x 1 ,x 2 ,x 3 ,x 4 using a pseudo orthogonal space-time block coding scheme such that the information symbol streams x 1 ,x 2 ,x 3 ,x 4 are transmitted via corresponding transmission antennas for first to fourth time periods, comprising the steps of: coding the information symbol streams x 1 ,x 2 ,x 3 ,x 4 in the first time period such that x 1 is transmitted via a first transmission antenna, x 2 is transmitted via a second transmission antenna, x 3 is transmitted via a third transmission antenna and x 4 is transmitted via a fourth transmission antenna; coding the information symbol streams x 1 ,x 2 ,x 3 ,x 4 in the second time period such that -x 2 * is transmitted via the first transmission antenna, -x 1 * is transmitted via the second transmission antenna, -x 4 * is transmitted via the third transmission antenna and -x 3 * is transmitted via the fourth transmission antenna; coding the information symbol streams x 1 ,x 2 ,x 3 ,x 4 in the third time period such that -x 1 is transmitted via the first transmission antenna, -x 2 is transmitted via the second transmission antenna, x 3 is transmitted via the third transmission antenna and x 4 is transmitted via the fourth transmission antenna; and coding the information symbol streams x 1 ,x 2 ,x 3 ,x 4 in the fourth time period such that x 2 * is transmitted via the first transmission antenna, -x 1 * is transmitted via the second transmission antenna, -x 4 * is transmitted via the third transmission antenna and x 3 * is transmitted via the fourth transmission antenna, where * denotes complex conjugate calculation.