Patent ID: 7039369

Claim:
A method for increasing transmit diversity gain in a wireless communication system including a transmitter with 2 N transmit antennas, where N is greater than one, and a receiver with one receive antenna, comprising: generating, in the transmitter, a stream of pairs of symbols in a form X 1 and X 2 ; space-time transmit diversity encoding each pair of symbols at a symbol-level stage to produce a 2 1 ×2 1 matrix C = [ X 1 X 2 X 2 * - X 1 * ] for each pair, where * denotes a complex conjugate; and space-time transmit diversity coding each pair of 2 1 ×2 1 matrices C of the previous state in a next stage at a block level to produce a 2 2 ×2 2 output matrix T = [ C 1 C 2 C 2 * - C 1 * ] = [ X 1 X 2 X 3 X 4 X 2 * - X 1 * X 4 * - X 3 * X 3 * X 4 * - X 1 * - X 2 * X 4 - X 3 - X 2 X 2 ] ; feeding transmit symbols of the output matrix T, in a left-to-right order, of each row, in a top-to-bottom order, to a corresponding different transmit antennas.