Patent ID: 7697904

Claim:
A method of transmitting a signal comprising: transmitting a first signal from a source device, according to a first space-time block code (STBC) matrix, to a relay device and a destination device; and transmitting a second signal from the relay device to the destination device, according to a second STBC matrix, the transmitted second signal based on the first signal received by the relay device from the source device, wherein the first signal and the second signal are respectively represented according to the following: x p = { 1 2 ⁢ x p ⁡ ( 1 ) , 1 2 ⁢ x p ⁡ ( 2 ) , 1 2 ⁢ x p ⁡ ( 1 ) * , ︷ STBC ⁢ ⁢ matrix ⁢ 1 2 ⁢ x p ⁡ ( 3 ) , … } ⁢ ⁢ x r p ′ = { 0 , 1 2 ⁢ x ^ p ⁡ ( 1 ) , - 1 2 ⁢ x ^ p ⁡ ( 2 ) * , 0 , … } [ Equation ⁢ ⁢ 4 ] where {circumflex over (x)} p represents the first signal as received by the relay device and (·)* represents the complex conjugate operation.