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Open-loop multi-stream transmission method and base station based on directional beam

A base station and beam technology, which is applied to the open-loop multi-stream transmission method based on directional beams and the field of base stations, can solve the unpredictable gain and leakage of MIMO signals, the difficulty of channel correction performance guarantee, and the unpredictability of single-stream weights and multi-dimensional channel coherence, orthogonality and other issues

Active Publication Date: 2019-04-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the multidimensional channel of the measurable MIMO channel degenerates into a Single-Input Mulit-Output (SIMO) single-dimensional channel, if the channel coefficients of the single-dimensional channel are used to map the multidimensional coefficients of the MIMO channel through simple grouping, Since the coherence and orthogonality of single-stream weights and multi-dimensional channels cannot be predicted, MINO grouping weights obtained through SIMO channel coefficient mapping and MIMO signals have unpredictable gains and leaks, and the performance of channel correction is very poor. hard to get protection

Method used

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  • Open-loop multi-stream transmission method and base station based on directional beam

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specific Embodiment 1

[0139] When acquiring the uplink channel response of the SIMO channel, the base station may directly use the UE's single uplink sounding reference signal (Sounding Reference Signal, SRS) to perform channel estimation to determine the uplink channel response of the SIMO channel. Of course, the possibility of using other reference signals for uplink channel estimation is not excluded.

[0140] It should be understood that, in this embodiment of the present invention, reference may be made to the prior art for the method for the base station to obtain the uplink channel response of the SIMO channel, and there may be other manners for specific implementation, which are not limited in this embodiment of the present invention.

[0141] Assuming that the SIMO channel is an 8*1 SIMO channel, the main eigenvector of the uplink channel response obtained by SVD decomposition is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and is ready for beamforming ...

specific Embodiment 2

[0151] Similar to the specific embodiment 1 of the present invention, it is assumed that the SIMO channel is an 8*1 SIMO channel, and the main eigenvector of the uplink channel response decomposed by SVD is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and is ready for beamforming with dual-stream narrow beam weighting. At this time, the source of the SIMO channel can be denoted as D=[d 0 d 1 ], in addition, the dual-stream beam weight matrix (the first matrix) of the SIMO channel is denoted as W r .

[0152] In this embodiment of the present invention, the vector [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T The beam weights (component vectors) in are divided into two groups of beam weights α according to the polarization direction 1 ,α 3 ,α 5 ,α 6 and α 0 ,α 2 ,α 4 ,α 7 , and select the beam weights of a group of polarization channels with larger statistical power, assuming α 1 ,α 3 ,α 5 ,α ...

specific Embodiment 3

[0163] Similar to the specific embodiment 1 of the present invention, it is assumed that the SIMO channel is an 8*1 SIMO channel, and the main eigenvector of the uplink channel response decomposed by SVD is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and is ready for beamforming with four-stream narrow beam weighting. At this time, the source of the SIMO channel can be denoted as D=[d 0 d 1 d 2 d 3 ], in addition, the four-stream beam weight matrix (the first matrix) of the SIMO channel is denoted as W r .

[0164] In this embodiment of the present invention, first, the feature vector [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , grouped by polarization direction into two groups of beam weights of polarization channels, which are the first group of beam weights α 0 ,α 1 ,α 2 ,α 3 and the second set of beam weights α 4 ,α 5 ,α 6 ,α 7 ; will [α 0 alpha 1 alpha 2 alpha 3 alpha 4 al...

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Abstract

Embodiments of the present invention provide an open-loop multi-stream transmission method and a base station based on directional beams. The base station includes: a first determining unit, configured to determine a first matrix according to an eigenvector, where the eigenvector is a channel of the base station. The main eigenvector obtained by the eigenvector decomposition of the uplink channel response, the eigenvector is an n-dimensional vector, n is the number of transmission channels of the channel of the base station, and the n-dimensional vector formed by any two row elements of the first matrix is ​​not The channel related to the base station is the SIMO channel of the base station, or a SIMO channel decomposed from the MIMO channel of the base station; the second determining unit is used to determine a second matrix, which is used to combine the first matrix with the channel of the base station. The transmission signal of the base station is randomly encoded; the channel correction unit is used for beamforming the transmission channel of the channel of the base station according to the first matrix and the second matrix.

Description

technical field [0001] The present invention relates to the field of communications, and more particularly, to an open-loop multi-stream transmission method and a base station based on a directional beam. Background technique [0002] In the field of wireless communication, multiple-input multiple-output (MIMO) technology based on spatial diversity has been widely used; for closed-loop and MIMO working methods based on uplink and downlink reciprocal measurement, due to its high accuracy, it is also the current mainstream. Implementation plan. However, limited by the processing capability of the terminal itself, many terminals only support single uplink and downlink multiple receptions, and many MIMO methods based on uplink and downlink reciprocal measurement cannot perform real uplink and downlink reciprocal measurement. [0003] When the terminal adopts the uplink single-transmission, an existing method is to use the single-stream packet reconstruction method to calculate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
CPCH04B7/06H04B7/0408H04B7/0456H04B7/0617
Inventor 张鹏程
Owner HUAWEI TECH CO LTD
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