method for feedback transmission in a radio communications system, and stations for a radio communications system

摘要

The aim of the invention is to transmit feedback information used for beam shaping from a subscriber station to a base station in a radio communications system comprising subscriber stations (MSk, MS1, MS2,...) and a base station (BS), said base station having an antenna device (AE) with several antenna elements (AE1 to AEM) that radiate a downlink signal, which is weighted each time with complex components (wi, i=1, ..., M) of a current weighting vector w = (w1 w2 ... wM)T, to a subscriber station (MSk). To this end, the subscriber station (MSk) makes a selection from a set of base vectors, a code word, which defines the selection made and which is of a prescribed length, is transmitted to the base station, and the base station generates the current weighting vector as a linear combination of the selected base vectors. The code words are associated with the possible selections in such a manner that two code words, which differ by more than one bit, code two selections that differ by no more than one selected base vector.