Patent Number: 7,089,039

Title: Method and device for feedback transmission in a radio communication system

Abstract: A method is provided for beam shaping in a radio communication system having subscriber stations and a base station, and an antenna device with a number of antenna elements that emit a downlink signal weighted with a coefficient of an actual weighting vector to a subscriber station, the actual weighting vector being updated via feedback information from the subscriber station. The subscriber station estimates the direction of a control vector in an M-dimensional vector space using measurements of the downlink signals, it detects a deviation of the estimated direction from the direction of a reference control vector and transmits information representative of the deviation to the base station. The base station then adapts the weighting vector using the representative information.

Inventors: Lobinger; Andreas (Miesbach, DE), Raaf; Bernhard (Munchen, DE), Seeger; Alexander (Feldkirchen, DE), Wiedmann; Ralf (Munchen, DE)

Assignee: Siemens Aktiengesellschaft

International Classification: H04M 1/00 (20060101)

Expiration Date: 8/08/02018