Patent ID: 7072409

Claim:
An N-channel space multiple radio communication method comprising the steps of: (a) generating transmission signals of N channels frequency converted to the same transmitting frequency by N independent transmitters, said N being an integer equal to or greater than 2, and providing said transmission signal of said N channels to N elements of a transmitting antenna for transmission therefrom; and (b-1) receiving said transmission signals of said N channels by N elements of a receiving antenna to generate N received signals; (b-2) dividing each of the N received signals into N divided signals corresponding to the N channels; (b-3) multiplying the N divided signals by N weighting factors, respectively, to produce N weighted signals for each of said N received signals, and (b-4) combining N weighted signals corresponding to each of the N channels to reconstruct the transmission signal of corresponding one of said N channels; wherein said step (a) includes a step of transmitting a known training sequence from each of the N elements of said transmitting antenna, sequentially; wherein said step (b-1) includes a step of setting all of the weighting factors to given values and a step of receiving, for each of the transmissions of the known training sequence from the N elements of said transmitting antenna, a known training sequence by successive selection of one of said N elements of said receiving antenna corresponding to one of the N channels to produce N received training sequences as said N received signals; said step (b-2) includes a step of dividing each of said N received training sequence into N divided training sequences corresponding to the N channels; said step (b-3) includes a step of multiplying the N divided training sequences by said N weighing factors, respectively, to produce N weighted training sequences for each of the N received training sequences; and said step (b-4) includes a step of obtaining correlation between each of the weighted training sequences and the known training sequence generated at the receiving side to thereby produce a correlation matrix of N×N elements, and a step of converging the weighting factors by an adaptive algorithm so that elements other than diagonal elements of said correlation matrix approach zero to thereby minimize cross correlation between said N received signals.