Verification of the antenna weights of the base station in a UMTS mobile radio receiver by use of the Viterbi algorithm with fed-back transmission diversity
US7551695B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 2004 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Jun 27, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0654
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A mobile station sends to the base stations a bit vector which contains weighting factors (w1, w2) for the amplitudes and/or the phases of the signals to be emitted from the antennas. The bit vector is updated by changing one bit position for each time slot, and by transmitting this from the mobile station to the base station in the form of a bit (e.g., an FBI (feedback information) bit). A trellis diagram can be set up comprising the possible states of the bit vector and the possible state changes (branches) and the Viterbi algorithm can be used for the determination of the weighting factors actually used by the base station, taking account of both the currently transmitted training symbols and the previously transmitted training symbols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.