Method and device for indicating and determining precoding vector

A vector and indication technology, applied in the field of precoding, can solve the problems of unreasonable indication information overhead and unsatisfactory overall performance gain, and achieve the effect of improving performance gain

Active Publication Date: 2018-08-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the scenario where the weighted sum of multiple component vectors with the most matching channel is used as the precoding vector, the weight of each component vector (that is, the number of quantized bits of the superposition coefficient) is equal, which will lead to feedback indicating the superposition coefficient The overhead of indicating information is unreasonable, resulting in unsatisfactory overall system performance gain

Method used

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  • Method and device for indicating and determining precoding vector

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0121] Example 1: If K 1 =K 2 , and K 1 and K 2 Both are recorded as K, then (X, Y, Z) of N component vectors can be expressed as the following form:

[0122]

[0123] Taking L=2, 3, 4, p=2, 3 as an example, the specific values ​​of (X, Y, Z) will be exemplarily described below. where L is the total number of component vectors in a single polarization direction. In this application, the discussion is based on dual polarization directions, so the total number of component vectors N=2L, and the specific implementation is not limited thereto. In addition, W_amp in the table below has the same meaning as X, S_amp has the same meaning as Y, and S_phase has the same meaning as Z.

[0124] In this application, "component vector index" may be an absolute index of a component vector, such as the index of the component vector in the basic codebook or the absolute index of the beam corresponding to the component vector; it may also be a relative index of the component vector, suc...

example 2

[0153] Example 2: If K 2 = 0, and K 1 Denoted as K, the (X, Y, Z) of N component vectors can be expressed as follows:

[0154]

[0155] Taking L=2, 3, 4, p=2, 3 as an example, the specific values ​​of (X, Y, Z) will be exemplarily described below. For explanations about L, W_amp, S_amp, S_phase and other relevant content, reference may be made to the above-mentioned example 1, which will not be repeated here.

[0156] (1)L=2

[0157] When L=2, N=4, and K can take any value from 0 to 3. Taking p=2 or 3 as an example, when K takes any value from 0 to 3, the (W_amp, S_amp, S_phase) of the N component vectors can be shown in Table 4:

[0158] Table 4

[0159]

[0160]

[0161] (2)L=3

[0162] When L=3, N=6, and K can take any value from 0 to 5. Taking p=2 or 3 as an example, when K takes any value from 0 to 5, the (W_amp, S_amp, S_phase) of the N component vectors can be shown in Table 5:

[0163] table 5

[0164]

[0165]

[0166] (3)L=4

[0167] When L=4...

example 3

[0172] Example 3: If K 2 =N-1, and K 1 Denoted as K, the (X, Y, Z) of multiple component vectors can be expressed as follows:

[0173]

[0174] Taking L=2, 3, 4, p=2, 3 as an example, the specific values ​​of (X, Y, Z) will be exemplarily described below. For explanations about L, W_amp, S_amp, S_phase and other relevant content, reference may be made to the above-mentioned example 1, which will not be repeated here.

[0175] (1)L=2

[0176] When L=2, N=4, and K can take any value from 0 to 3. Taking p=2 or 3 as an example, when K takes any value from 0 to 3, the (W_amp, S_amp, S_phase) of the N component vectors can be shown in Table 7:

[0177] Table 7

[0178]

[0179]

[0180] (2)L=3

[0181] When L=3, N=6, and K can take any value from 0 to 5. Taking p=2 or 3 as an example, when K takes any value from 0 to 5, the (W_amp, S_amp, S_phase) of the N component vectors can be shown in Table 8:

[0182] Table 8

[0183]

[0184]

[0185] (3)L=4

[0186] ...

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Abstract

The embodiment of the invention discloses a method and a device for indicating and determining a precoding vector, which relate to the precoding technology and are helpful for realizing the followingbeneficial effects: on the basis of guaranteeing the precoding vector to reach certain accuracy, rationally setting overhead of indication information of a feedback indication superposition factor, and thereby improving system overall performance gain. The method may comprise the following steps: generating the indication information, and sending the indication information, wherein the indicationinformation is used for indicating a plurality of component vectors of an ideal precoding vector and the superposition factor of each component vector, wherein the superposition factor of the component vector comprises at least one of the following types: a broadband amplitude factor, a narrowband amplitude factor and a narrowband phase factor; and except for a normalized benchmark component vector, at least two component vectors of the plurality of component vectors have different quantization bit numbers of the superposition factors of the same type.

Description

technical field [0001] The present application relates to precoding technology, and in particular to a method and device for indicating and determining a precoding vector. Background technique [0002] The emergence of multiple input multiple output (Multiple Input Multiple Output, MIMO) technology has brought revolutionary changes to wireless communication. MIMO technology can significantly improve the performance of the wireless communication system by deploying multiple antennas on the transmitting end device and the receiving end device. For example, in a diversity scenario, MIMO technology can effectively improve transmission reliability; in a multiplexing scenario, MIMO technology can greatly improve transmission throughput. [0003] The MIMO system usually uses precoding technology to improve the channel, so as to enhance the effect of spatial multiplexing (Spatial Multiplexing). Specifically, the precoding technology uses a precoding matrix that matches the channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/0456
CPCH04B7/0413H04B7/0456H04B7/0626H04B7/065H04B7/0417
Inventor 蒋鹏金黄平韩玮尚鹏
Owner HUAWEI TECH CO LTD
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