US2010202553A1

5G,4G

Title

MIMO Precoding Enabling Spatial Multiplexing, Power Allocation and Adaptive Modulation and Coding

Application Number:

US20100762013

Family ID:

Publication Date:

12-08-2010

Application Date:

16-04-2010

Priority Date:

02-10-2006

Current Assignee:

Publication Country:

US

Declaring Company:

Abstract  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.

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