Method and device relating to self-calibration of group antenna system having time varying transmission characteristics
US6229483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Jul 28, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/267
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention concerns calibration of a group antenna system (11) with a number of radiation elements (X1, . . . , XN) and a number of controllable transmitters (T1, . . . , TN), in which the transmitters at the reception of an input signal transmit output signals for feeding the radiation elements. The calibration is done to be able to obtain a time varying antenna diagram at transmission and should be able to perform under operation without interrupting the normal operation of the group antenna system (11). The group antenna system comprises a control system for automatically correcting the control of the transmitters (T1, . . . , TN) for error deviations thereof. The group antenna system (11) comprises means (37) for generating a sum signal corresponding to the sum of the output signals. The control system generates error signals, giving information about the error deviations, employing the sum signal, the input signal and the complex amplifications varying with time for the transmitters. The control of the transmitters (T1, . . . , TN) is continuously corrected employing the error signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.