Channel quality index feedback reduction for broadband systems
US8020075B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Oct 27, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W28/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and methodology are disclosed for exploiting channel correlation in time and/or frequency to reduce CQI feedback in wireless communications systems. By compressing CQI feedback at the receiver to reduce redundancy in CQI feedback information that results from the channel correlation, the average feedback rate is reduced. In various embodiments, redundancy in time may be removed from the CQI feedback by monitoring variations of the CQI information in time at the receiver so that CQI information for a given CQI reporting instance is communicated to the transmitter only if it differs from the CQI information for the previous CQI reporting instance. Otherwise, no feedback is performed. In other embodiments, CQI feedback is compressed by performing a discrete cosine transform (DCT) on the CQI data. The compressed CQI feedback information is then communicated to the transmitter through the feedback control channel where it is decoded into the original CQI information and used to generate signal processing information for various sub-carriers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.