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Method and system for precoding

A precoding and precoding technology, applied in the field of precoding methods and systems, can solve problems such as low error correction coding rate

Active Publication Date: 2015-03-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separately reported 2-bit RI is more secure than jointly reported 8- or 11-bit PMI and CQI because 2-bit RI has a lower error correction coding rate

Method used

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  • Method and system for precoding
  • Method and system for precoding
  • Method and system for precoding

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Embodiment Construction

[0033] Embodiments of the present invention relate to a method for reporting multi-quantized representations of channel state information of a propagation channel on a capacity-constrained feedback channel using a dual codebook structure. A wireless communication system includes at least one transmitter and at least one receiver. The transmitter may be configured in a network entity such as a base station, eNodeB or access point. The receiver may be configured in a user equipment (User Euipment, UE for short), such as a mobile device, a cellular phone, a Personal Digital Assistant (PDA) with wireless capability, a notebook computer with wireless capability, or other similar devices. When the transmitter is equipped with multiple transmit antennas, at least one reference signal sent to the receiver and a feedback channel from the receiver allow transmission using codebook-based precoding processing sent from the transmitter.

[0034] For MIMO OFDMA systems operating at high th...

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Abstract

The present disclosure relates to channel state feedback in a communication system. The method includes obtaining a reference signal from an access point; deriving a rank indication, a codebook subset selection indication and a precoding matrix index based on the obtained reference signal; sending a first feedback message conveying the rank indication and the codebook subset selection indication, and sending a second feedback message conveying the precoding matrix index, to the access point; and receiving, from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.

Description

technical field [0001] The present invention relates to communication technology, and more particularly, to a precoding method and system. Background technique [0002] In MIMO OFDMA cellular systems, closed-loop MIMO precoding is defined to enable high-throughput downlink transmission for fixed and mobile users. The feedback information from the receiver to the transmitter is obtained by the transmitter in the form of a Precoding Matrix Index (Precoding Matrix Index, PMI for short) report. This PMI is used to represent the matrix in the codebook (a set of matrices) that the transmitter uses to obtain the downlink precoder. [0003] A simple codebook structure is used in the first generation of MIMO OFDMA systems, so that the PMI can be represented in several bits. Small codebooks can be used to achieve coarse quantization of spatial channels. For example, a 4-bit codebook is defined, and the 4-bit PMI can be reported through a capacity-constrained feedback channel called...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06
CPCH04L1/0028H04B7/0632H04L5/0037H04L1/0026H04L5/0057H04B7/0486H04L5/006H04B7/0417H04L25/03949H04L5/0048H04L25/03923H04L5/0023H04B7/0639H04B7/063H04L1/06H04W88/08
Inventor 大卫·马瑞泽周永行
Owner HUAWEI TECH CO LTD