Patent ID: 8270518

Claim:
A method of multiple input multiple output downlink communications comprising: mapping complex-valued modulation symbols onto one or more transmission layers by mapping complex-valued modulation symbols d (q) (0), . . . , d (q) (M symb (q) −1) for code word q onto the layers x(i)=[x (0) (i) . . . x (v−1) (i)] T , i=0,1, . . . , M symb layer −1 where v is the number of layers and M symb layer is the number of modulation symbols per layer, with a maximum of two layers per codeword; precoding the complex-valued modulation block of vectors x(i)=[x (0) (i) . . . x (v−1) (i)] T , i=0,1, . . . , M symb layer −1 and generating a block of vectors y(i)=[ . . . y (p) (i) . . . ] T , i=0,1,. . . , M symb ap −1 mapped onto at least four antenna ports; for five layers supplying the complex-valued modulation block of vectors of a first codeword directly to precoding, splitting the complex-valued modulation block of vectors of a second codeword into two parts for supply to precoding, and splitting the complex-valued modulation block of vectors of a third codeword into two parts for supply to precoding.