Patent ID: 8040968

Claim:
A method for transmitting data symbols from two antennas, comprising: mapping an input bit stream into complex symbols x 1 , x 2 , x 3 , and x 4 based on a predetermined modulation constellation, said complex symbols x 1 , x 2 , x 3 , and x 4 for transmission to a remote receiver; first transmitting x 1 +θx 3 from a first antenna and x 2 +θx 4 from a second antenna at a first sample time; and second transmitting −x 2 *−θx 4 * from said first antenna and x 1 *+θx 3 * from said second antenna at a second sample time, wherein no transmissions other than first transmitting and second transmitting are made to transmit said complex input symbols x 1 , x 2 , x 3 , and x 4 to said remote receiver; wherein x* is the complex conjugate of x and θ is a parameter that depends on said predetermined modulation constellation.