Patent ID: 8743979

Claim:
A communication method performed by a relay node in a wireless network, comprising: receiving transmit signals from a source; precoding and decoding the transmit signals; and transmitting the precoded and decoded transmit signals to a destination by way of an antenna, wherein the precoding and decoding employs a channel matrix H sj =I N T1 B 2 , where I N T1 denotes an N T 1 ×N T 1 identity matrix, denotes the Kronecker product, and B 2 is expressed as: B 2 = J 2 ⁢ Λ 2 ⁢ J 2 - 1 J 2 = [ - h sjQ - jh shQ - jh sjQ - h sjQ ] Λ 2 = [ h sjI ± jh sjQ 0 0 h sjI ∓ jh sjQ ] , and where: J denotes a jacket matrix; h sjQ denotes a quadrature, imaginary part, of a complex channel gain from the source to a j-th relay; and h sjI denotes an in-phase, real part, of the complex channel gain from the source to the j-th relay.