Patent ID: 7248645

Claim:
A method of closed loop wireless communication of signals using an adaptive transmit antenna array of size N, in which a plurality M of copies of signals to be transmitted by said transmit antenna array are produced with delays and weights where the weights are functions of the multi-path transmission channel characteristics (H) from said transmit antenna array to a receive antenna array of a receiver and are combined before transmission by said transmit antenna array, the method comprising: setting said weights substantially equal to a vector w, which is a concatenation of vectors w 1 , w 2 , . . . w N , where w i =(w i,1 , w i,2 , . . . w i,M ) t represents the coefficients of the FIR filter applied on transmit antenna #i and M is the number of elementary time intervals in the FIR filter delay scheme, calculating w to be substantially equal to the eigenvector corresponding to the largest eigenvalue of the matrix H H H, where H is the matrix of the equivalent channel seen by the symbol data and H H is the Hermitian transform of the matrix H, receiving the multi-path signal components propagated to each receiver element with distinguishable delays according to the propagation path, and combining by said receiver the received signal components from each receive antenna element with delays and weights (u) that are respective functions of the multi-path transmission channels, wherein said delays and weights applied by said receiver are substantially equal to u = w H ⁢ H H w H ⁢ H H ⁢ Hw .