Patent ID: 6934563

Claim:
Apparatus for a radio communication system having a first communication station with which data is communicated, data communication to the first communication station effectuated upon a first channel and data communication by the first communication station effectuated upon a second channel, the first communication station having an antenna array capable of forming an adaptively-selectable antenna pattern configuration, said apparatus for selecting the antenna pattern configuration formed by the antenna array responsive to indications of data communicated to the first communication station, said apparatus comprising: a first channel correlation matrix generator adapted to receive the indications of the data communicated to the first communication station, said first channel correlation matrix for generating a first-channel correlation matrix, the first-channel correlation matrix defined in terms of first Fourier series coefficients of first values; a reformulator coupled to receive the indications of the first-channel correlation matrix generated by said first-channel correlation matrix generator, said reformulator for reformulating the indications into a vector representation of the first-channel correlation matrix, the vector representation including a coefficient vector; a coefficient-vector calculator operable responsive to formation of the vector representation by said reformulator, said coefficient-vector calculator for calculating values of the coefficient vector forming a portion of the vector representation formed by said reformulator; a second-channel, channel characteristic calculator coupled to receive indications of the values of the coefficient vector formed by said coefficient-vector calculator, said second-channel channel characteristic calculator for calculating indications of characteristics of the second channel, the indications of the characteristics of the second channel, also defined in terms of the first Fourier series coefficients at the first values, used to select the antenna pattern configuration.