Patent ID: 8195242

Claim:
A method comprising: providing a smart antenna; determining at least one signal operatively configured for subspace complementary beamforming (SCBF) in a wireless communication system; generating the at least one signal such that the signal is operatively configured to cause said smart antenna to perform said SCBF and to transmit at least one complementary beam; and determining the at least one signal using a Steering Matrix: A=[α(θ 1 ) α(θ 2 ) . . . α(θ k )], wherein α(θ k ) represents a steering vector of user k; wherein: if W=A*B, where B is a non-singular K-by-K matrix, then using a complementary beamforming matrix of W c = k 0 ⁢ C 0 N ⁡ [ u K + 1 u K + 2 … u N ] wherein C 0 =Nc 0 is the level of the main lobe, k 0 is the scaling factor and u l is the l-th column vector of U; otherwise using a complementary beamforming matrix of W c = k 0 ⁢ C 0 N ⁡ [ u _ 1 u _ 2 … u _ N - K ] wherein ū 1 is the l-th left singular vector of the matrix (Σ l=K+1 N ũ 1 ũ 1 H )UΛ c = UΛV H , where A*=Ũ{tilde over (Λ)}{tilde over (V)} H is assumed and a scattering channel H*=Ũ{tilde over (Λ)}{tilde over (V)} H is assumed.