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Method and device for acquiring pre-coding matrix index

一种预编码矩阵、指示的技术，应用在通信领域，能够解决精度低等问题，达到减少开销、提高反馈精度的效果

Active Publication Date: 2011-04-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing 3GPP LTE R8 system is mainly designed for SU-MIMO (Single User MIMO, single user MIMO), using a fixed codebook, and the accuracy of the feedback PMI is low

Method used

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  • Method and device for acquiring pre-coding matrix index

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] An embodiment of the present invention provides a method for obtaining a precoding matrix indication, see figure 1 , the method includes:

[0036] 101: Obtain a first rotation matrix according to the first channel information.

[0037] 102: Obtain a first difference matrix according to the first rotation matrix and the currently obtained instantaneous beamforming matrix / precoding matrix.

[0038] 103: Quantize the first differential matrix according to the first differential codebook and the pre-known first rank indication according to a preset quantization criterion, to obtain a differential precoding matrix indication.

[0039] Wherein, when the first channel information is the first long-term channel covariance matrix, obtaining the first rotation matrix according to the first channel information may specifically include:

[0040] performing eigenvalue decomposition on the first long-term channel covariance matrix to obtain the eigenmatrix of the first long-term ch...

Embodiment 2

[0074] The embodiment of the present invention provides a method for obtaining the precoding matrix indication, using the differential PMI based on the long-term channel covariance matrix for feedback, the following downlink (that is, eNode B sends data to the UE, and the UE feeds back the precoding matrix indication to the eNode B ) as an example, see figure 2 , the method includes:

[0075] 201: eNode B instructs UE to use non-differential PMI or based on the first long-term channel covariance matrix R UE If the eNode B instructs the UE to use the non-differential PMI for feedback, go to 208; otherwise, go to 202.

[0076] Specifically, the eNode B may indicate to the UE through high-level signaling or a downlink physical control channel. In addition, different identifications can be used to distinguish whether to indicate the use of non-differential PMI or use based on the first long-term channel covariance matrix R UE The differential PMI, for example: 0 can be used to...

Embodiment 3

[0120] An embodiment of the present invention provides a method for obtaining a precoding matrix indication, using a reference PMI (using PMI ref Indicates that the differential PMI of ) is fed back, and the following uplink (that is, the UE sends data to the eNode B, and the eNode B feeds back the PMI to the UE) is an example for illustration, see image 3 , the method includes:

[0121] 301: eNode B determines to use non-differential PMI or based on reference PMI ref Feedback the differential PMI and notify the UE, if the eNode B notifies the UE that the non-differential PMI will be used, go to 308; otherwise, go to 302.

[0122] Which refers to PMI ref It can be: use the non-differential wideband PMI or non-differential adjacent subband PMI that the eNode B recently instructed the UE to use as the reference PMI ref or in step 208 of embodiment 2, based on the characteristic matrix of the long-term channel covariance matrix, the non-differential PMI obtained by non-differ...

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Abstract

The invention discloses a method and device for acquiring a pre-coding matrix index, which belongs to the technical field of communication. The method comprises the steps of: acquiring a first rotation matrix according to first channel information, acquiring a first difference matrix according to the first rotation matrix and a currently obtained instantaneous beam figurate matrix / pre-coding matrix, acquiring a difference pre-coding matrix index by quantizing the first difference matrix according to a first difference codebook and a pre-informed first rank instruction on the basis of the pre-set quantitative criteria. The device comprises a first rotation matrix acquisition module, a first difference matrix acquisition module and a difference pre-coding matrix index acquisition module. A difference PMI (Purchase Management Index) is acquired according to the channel information, the difference PMI is used for feedback, which not only can reduce expenses, but also can improve the feedback accuracy.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for acquiring a precoding matrix indication. Background technique [0002] With the continuous development of communication technology, in a MIMO (Multiple Input Multiple Output, multiple input multiple output) wireless system, the data sending end (such as eNode B (evolved Node B, evolved base station)) can be based on the pre-known RI (Rank Indicator, rank indication), and the PMI (Precoding Matrix Indicator, precoding matrix indication) fed back by the data receiving end (such as UE (User Equipment, user equipment)), to obtain the BF (Beam Forming, beamforming) matrix / precoding matrix , and then use the BF matrix / precoding matrix to preprocess the data to be sent, and send the preprocessed data to the data receiving end through multiple antennas, so that the data transmission process can adapt to the change of the channel state and improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
CPCH04B7/0626H04B7/0641H04B7/0663H04B7/065H04B7/0639
Inventor 王建国周永行
Owner HUAWEI TECH CO LTD
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