Limited channel information feedback error-free channel vector quantization scheme for precoding MU-MIMO
US8761288B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2009 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Nov 2, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0009
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multiuser downlink multiple-input multiple-output (MIMO) system with limited channel information feedback includes an error-free channel vector quantization scheme. Each user has multiple antennas, and the base station includes a matching number of antennas. Each MIMO channel is measured at the terminus end of a corresponding user, and used to obtain the channel state information at the receiver (CSIR). A few data bits of CSIR information are feed back to the base station through the limited feedback channels. The base station collects all these CSIR feedback data bits into a CSI at the transmitter (CSIT). The CSIT is used to determine which users are served, and how to configure a corresponding multi-user precoder. The user data channels will later all be transmitted through such precoder. A codebook of channel quantization vectors is pre-defined and distributed amongst the base station and all the users.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.