Patent ID: 8503516
Filing Date: 2013-08-06
Classification: H04B

Abstract:
1. A method for performing feedback in a multi-antenna system, the method comprising: measuring, by a reception end, a spatial channel of the multi-antenna system; calculating a spatial channel covariance by using the measured spatial channel; determining feedback information from the calculated spatial channel covariance; determining whether or not antenna configuration information has been received from the transmission end, wherein if it is determined that the antenna configuration information has been received from the transmission end, the feedback information is determined with a predefined closed form with respect to a corresponding antenna configuration in the calculated spatial channel covariance; and transmitting the determined feedback information to a transmission end, wherein if it is determined that the antenna configuration information has not been received from the transmission end, the feedback information is determined with a certain closed form among all predefined closed forms in the calculated spatial channel covariance, wherein when a transmission end is a cross-polarized antenna array, the predefined closed form is represented by: R″ =C(P where P: permutation matrix,