MIMO precoding enabling spatial multiplexing, power allocation and adaptive modulation and coding
US7702029B2 · kind B2 · utility
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Key dates
| Filing date | Oct 2, 2006 |
| Grant date | Apr 20, 2010 |
| Priority date | — |
| Expiry date | Nov 30, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0009
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.