Patent ID: 7505527

Claim:
A transmitter for transmitting modulation symbols in a wireless communication system, comprising: a plurality of transmit antennas for achieving transmit diversity; a space time encoder for generating a transmission coding matrix with four rows corresponding to transmission time periods and four columns corresponding to the transmit antennas when the number of the transmit antennas is 4, encoding a plurality of input symbols into a plurality of symbol combinations to transmit the input symbols once from each transmit antenna at each time period by using the transmission coding matrix, and outputting the symbol combinations to the transmit antennas during the transmission time periods, the symbol combinations having orthogonal symbols, inversions and conjugates of the input symbols; and a phase rotator part for selectively rotating the phases of some of the symbols in the at least two columns of the transmission coding matrix by a predetermined phase value, wherein the transmission coding matrix is one of [ s 1 s 2 s 3 * s 4 * s 2 * - s 1 * s 4 - s 3 s 3 s 4 - s 1 * - s 2 * s 4 * - s 3 * - s 2 s 1 ] ⁡ [ s 1 s 2 s 3 * - s 4 * s 2 * - s 1 * s 4 s 3 s 3 s 4 - s 1 * s 2 * s 4 * - s 3 * - s 2 - s 1 ] ⁡ [ s 1 s 2 s 3 * - s 4 * s 2 * - s 1 * - s 4 - s 3 s 3 s 4 - s 1 * s 2 * s 4 * - s 3 * s 2 s 1 ] ⁢ [ s 1 s 2 s 3 * s 4 * s 2 * - s 1 * - s 4 s 3 s 3 s 4 - s 1 * - s 2 * s 4 * - s 3 * s 2 - s 1 ] ⁡ [ s 1 s 2 - s 3 * - s 4 * s 2 * - s 1 * s 4 - s 3 s 3 s 4 s 1 * s 2 * s 4 * - s 3 * - s 2 s 1 ] ⁡ [ s 1 s 2 - s 3 * s 4 * s 2 * - s 1 * s 4 s 3 s 3 s 4 s 1 * - s 2 * s 4 * - s 3 * - s 2 - s 1 ] ⁢ [ s 1 s 2 - s 3 * - s 4 * s 2 * - s 1 * - s 4 s 3 s 3 s 4 s 1 * s 2 * s 4 * - s 3 * s 2 - s 1 ] ⁡ [ s 1 s 2 - s 3 * s 4 * s 2 * - s 1 * - s 4 - s 3 s 3 s 4 s 1 * - s 2 * s 4 * - s 3 * s 2 s 1 ] where s 1 , s 2 , s 3 and s 4 represent four input symbols.