Systems and methods for closed-loop and open-loop wireless communications
US8934850B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2008 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Dec 21, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to user equipment (UE) having at least two transmit antennas that are capable of transmitting RF signals to a base station, which selects either an open-loop mode or a closed-loop mode depending on how the RF signals from the UE are changing. In the closed-loop mode, the base station periodically evaluates the RF signals from the UE and selects which of the UE's transmit antennas are to be used. This information is then sent to the UE. If the base station determines that the RF signals from the UE are changing too rapidly for effective control, then the base station selects the open-loop mode, such that the UE selects which of the UE's transmit antennas are to be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.