Method for mapping downlink dedicated pilots to resource elements in extended cyclic prefix frame structure
US8391233B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 25, 2008 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Sep 27, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/068
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method for mapping downlink dedicated pilots to resource elements in an Extended Cyclic Prefix frame structure, applied in a long term evolution system, includes the following steps: the first downlink dedicated pilot of each port is mapped to the specific position of a physical resource block; other downlink dedicated pilots of the port are mapping-processed according to the time-domain interval, frequency-domain interval and a preset regulation; the time-domain interval is two or three OFDM symbols, and the frequency-domain interval is two subcarriers of the same time domain. By defining the positions of pilots in the physical resource block, downlink dedicated pilots can obtain the information of all channels when a base station uses a beamforming of more than four antennas. Making the channel information obtained by dedicated pilots contain the real channel information and the process-weight-value of a beamforming, a UE does not need to obtain the transmission-weight-value of a beamforming, thereby avoiding the feedback overhead of beamforming weight-values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.