Systems and methods for radio frequency calibration exploiting channel reciprocity in distributed input distributed output wireless communications
US12355520B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2024 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | Oct 21, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0224
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Systems and methods are described for radio frequency (RF) calibration in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”) exploiting uplink/downlink channel reciprocity. The RF calibration is used to compute open-loop downlink precoder based on uplink channel estimates, thereby avoiding feedback overhead for channel state information as in closed-loop schemes. For example, a MU-MAS of one embodiment includes a wireless cellular network with one or multiple beacon stations, multiple client devices and multiple distributed antennas operating cooperatively via precoding methods to eliminate inter-client interference and increase network capacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.