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

A base station and beam technology, applied in the open-loop multi-stream transmission method based on directional beams and the field of base stations, can solve the problems of unpredictable single-stream weights and multi-dimensional channel coherence, orthogonality, unpredictable gain and leakage of MIMO signals, It is difficult to guarantee the performance of channel correction, etc.

Active Publication Date: 2016-07-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When the multidimensional channel of the measurable MIMO channel degenerates into a Single-InputMulit-Output (Single-InputMulit-Output, SIMO) single-dimensional channel, if the channel coefficient of the single-dimensional channel is used to map the multidimensional coefficient of the MIMO channel through simple grouping, due to It is impossible to predict the coherence and orthogonality of single-stream weights and multi-dimensional channels, so MINO grouping weights obtained through SIMO channel coefficient mapping and MIMO signals have unpredictable gains and leaks, and the performance of channel correction is difficult. be guaranteed

Method used

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

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specific Embodiment 1

[0137] When acquiring the uplink channel response of the SIMO channel, the base station may directly use the UE uplink single-send Sounding Reference Signal (SRS) to perform channel estimation and 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.

[0138] It should be understood that, in the embodiment of the present invention, the method for the base station to obtain the uplink channel response of the SIMO channel may refer to the prior art, and there may be other ways for its specific implementation, which are not limited in the embodiment of the present invention.

[0139] Assuming that the SIMO channel is an 8*1 SIMO channel, the main eigenvector obtained by SVD decomposition of the uplink channel response is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and prepare to beamform using two-stream narrow beam weighting. At this tim...

specific Embodiment 2

[0149]Similar to the specific embodiment 1 of the present invention, assuming that the SIMO channel is an 8*1 SIMO channel, the main eigenvector of its uplink channel response after SVD decomposition is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and prepare to beamform using two-stream narrow beam weighting. At this time, the information source of the SIMO channel can be written 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 .

[0150] In the 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 alpha 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 6 . At ...

specific Embodiment 3

[0161] Similar to the specific embodiment 1 of the present invention, assuming that the SIMO channel is an 8*1 SIMO channel, the main eigenvector of its uplink channel response after SVD decomposition is [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , and prepare to beamform using four-stream narrow beam weighting. At this time, the information source of the SIMO channel can be written 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 .

[0162] In the embodiment of the present invention, firstly, the feature vector [α 0 alpha 1 alpha 2 alpha 3 alpha 4 alpha 5 alpha 6 alpha 7 ] T , grouped according to the polarization direction and divided into two groups of beam weights of polarization channels, which are respectively the first group of beam velocity weights α 0 ,α 1 ,α 2 ,α 3 and the second set of beam weights α 4 ,α 5 ,α 6 ,α 7 ; put [α 0 alpha ...

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Abstract

The embodiment of the invention provides an open loop multi-stream transmission method based on a directional beam and a base station. The base station comprises a first determining unit used for determining a first matrix according to a feature vector, wherein the feature vector is a main feature vector obtained by uplink channel response of a channel of the base station by feature vector decomposition, the feature vector is a n-dimensional vector, n refers to the number of transmitting channels of the channel of the base station, a channel irrelevant to the channel of the base station of the n-dimensional vector formed by any two rows of elements of the first matrix respectively is an SIMO channel of the base station, or an SIMO channel decomposed from an MIMO channel of the base station; a second determining unit used for determining a second matrix and combining a transmitting signal of the first matrix to the channel of the base station to carry out random encoding; and a channel correction unit used for carrying out beam forming on the transmitting channels 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 communication field, and more specifically, to an open-loop multi-stream transmission method based on directional beams and a base station. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology based on space diversity has been widely used in the field of wireless communication; closed-loop and MIMO working methods based on uplink and downlink reciprocity measurement are currently mainstream implementations due to their high precision. Program. However, limited by the processing capability of the terminal itself, many terminals only support uplink single transmission and downlink multi-receipt, and many MIMO methods based on uplink and downlink reciprocity measurement cannot perform real uplink and downlink reciprocity measurement. [0003] When the terminal adopts uplink single transmission, an existing method is to use single-stream packet reconstruction for the weight calculation of the ...

Claims

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Application Information

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