Beam forming method
AssigneeSiemens Aktiengesellschaft
InventorsChristopher Brunner, Martin Haardt, Joachim Hammerschmidt, Alexander Seeger
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Abstract
In a radio communication system, a beam is formed between subscriber stations and a base station which has an antenna device with several antenna elements. The antenna elements emit a downlink signal based on respective weighing with coefficients of a weighting vector. A plurality of weighting vectors are determined at the subscriber station in an initialization phase and transmitted to the base station. In a subsequent working phase, the subscriber station selects a dominant weighting vector from the weighting vectors and transmits a designation of the selected weighting vector to the base station.
Claims24
A method for beamforming in a radio communications system having subscriber stations (MSk, MS1 to MSn) and having a base station (BS) which has an antenna device (AE) with a number of antenna elements (A1 to AM), which emit a downlink signal in each case weighted with coefficients wi, i=1, . . . M of a current weighting vector w characterized in that
- a) a number of first weighting vectors w(j) are determined in an initialization phase, and
- b) the current weighting vector w which is used for the emission of one time slot of the downlink signal which is intended for the subscriber station (MSk) is cyclically redefined in a working phase on the basis of the determined first weighting vectors.
The method as claimed in one of claims 3 to 18, characterized in that the number of determined first weighting vectors is 2n, n=2, 3, . . . , and in that the designation, which comprises n bits, of the dominant weighting vector is transmitted in portions of a bits, a=1, . . . , n, in each time slot allocated to the subscriber station.
Dependencies are inferred from the claim text.