Patent · US Expired

Method and device for feedback transmission in a radio communication system

US7089039B2 · kind B2 · utility

1Cited by

1References

25Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Andreas Lobinger · Grafing, DE
Bernhard Raaf · Hersbruck, DE
Alexander Seeger · Straubing, DE
Ralf Wiedmann · Birkenfeld, DE

Key dates

Filing date	Nov 15, 2001
Grant date	Aug 8, 2006
Priority date	—
Expiry date	May 15, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04B7/0617
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.