Channel state information feedback
US8724572B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2010 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Sep 11, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/241
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an embodiment, state of a wireless channel on which information is received is measured; the measured state is used to select from a codebook a plurality of N codewords which optimize a predefined measure, and first and second codewords of the plurality are reported which best optimizes and next-best optimizes the predefined measure. If by example the above is done by a user equipment UE, in another embodiment the network receives first and second indications, searches a codebook using the first and second indications to find the first and second codewords; and utilizes them to improve the channel state information, such as by interpolating between them to find an estimate of the channel. In examples the channel is a MIMO channel that is estimated at two or more antenna ports, there are interpolation weights sent with the codeword indications, and the interpolating uses a geodesic algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.