Patent ID: 8363753

Claim:
A method for transmit diversity encoding of symbols to be transmitted by a transmitter in a wireless communication system, wherein said transmitter employs four transmit antennas, said method comprising, for a first block of symbols and a second block of symbols, each of said first and second block of symbols being represented by a number of elements, the number being equal to L determining a third block of symbols, being represented by L elements, by reversing, cyclically shifting and conjugating the elements representing said first block of symbols and adding a minus sign to every other of the elements achieved from the reversing, cyclically shifting and conjugating the elements representing the first block of symbols, determining a fourth block of symbols, being represented by L elements, by reversing, cyclically shifting and conjugating the elements representing said second block of symbols and adding a minus sign to every other of the elements achieved from the reversing, cyclically shifting and conjugating the elements representing the second block of symbols, inserting a number of zeroes, the number being equal to D, after every group of D consecutive elements of the elements representing said first and third block of symbols, respectively, so as to obtain a modified first block of symbols for transmission and a modified third block of symbols for transmission, and inserting a number of zeros, the number being equal to D, before every group of D consecutive elements of the elements representing said second and fourth block of symbols, respectively, so as to obtain a modified second block of symbols for transmission and a modified fourth block of symbols for transmission, wherein said modified first, second, third, and fourth block of symbols for transmission are provided for transmission from said four transmit antennas, and wherein the elements representing said block of symbols are cyclically shifted with a shift size p, wherein p is an even number.