Patent ID: 7197082

Claim:
A method of transmitting signals from a transmitter comprising two antennas in a wireless telecommunications network, comprising: space-time block encoding at least one data sequence; before transmitting the data sequence, applying to the data sequence a linear transformation dependent upon knowledge of correlation among the antennas so as to at least partially compensate the transmitted signals for said correlation, wherein said correlation is characterized in an antenna correlation matrix having eigenvalues γ r,l , γ r,2 and eigenvectors w 1 , w 2 , and the linear transformation depends on the said eigenvalues, on said eigenvectors, and on a ratio of symbol energy (E s ) to noise variance (σ 2 ); and transmitting the encoded and transformed data sequence; wherein: the method further comprises calculating a value of a parameter β related to the ( 1 λ r , 2 2 - 1 λ r , 1 2 ) / ( E S σ 2 ) ; and the linear transformation is determined from β and from the eigenvectors w 1 , w 2 of the antenna correlation matrix.