Channel estimation method and device

A technology for channel estimation and indication information, which is applied in the field of precoding and can solve problems such as large indication overhead.

Active Publication Date: 2019-08-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above precoding vectors are usually the precoding vectors used to precode a spatial stream in one frequency band. The receiver device usually needs to indicate the precoding vectors corresponding

Method used

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Embodiment 1

[0187] In this embodiment, M N-dimensional precoding vectors form an N×M space-frequency matrix H. Each N-dimensional precoding vector is used as a column vector of the space-frequency matrix H. The space-frequency matrix H is generated by weighted combination of multiple space-frequency component matrices. Each space-frequency component matrix is ​​the product of a space-domain component vector and a conjugate transpose vector of a frequency-domain component vector.

[0188] Based on this, in this embodiment, the space-frequency matrix H can be expressed as the following formula:

[0189]

[0190] Wherein, W is the number of space-frequency component matrices. u 1w is the spatial domain component vector corresponding to the wth spatial frequency component matrix. u 2w is the frequency-domain component vector corresponding to the wth space-frequency component matrix, is u 2w The conjugate transpose vector of . is the wth space-frequency component matrix the weig...

Embodiment 2

[0192] In this embodiment, M N-dimensional precoding vectors form an M×N space-frequency matrix H. The conjugate transpose vector of each N-dimensional precoding vector is used as a row vector of the space-frequency matrix H. The space-frequency matrix H is generated by weighted combination of multiple space-frequency component matrices. Each space-frequency component matrix is ​​the product of a frequency-domain component vector and a conjugate transpose vector of the space-domain component vector.

[0193] Based on this, in this embodiment, the space-frequency matrix H can be expressed as the following formula:

[0194]

[0195] in, is u 1w The conjugate transpose vector of . The explanation of other parameters can refer to the above, and will not be repeated here.

[0196] Based on any one of the first and second embodiments above, the spatial domain component vectors corresponding to different spatial frequency component matrices may be the same or different. The...

Embodiment 3

[0269] In this embodiment, M N-dimensional precoding vectors form an N×M space-frequency matrix H. Each N-dimensional precoding vector is used as a column vector of the space-frequency matrix H. The space-frequency matrix H is generated by weighted combination of multiple space-frequency component matrices. Each space-frequency component matrix is ​​selected from a set of space-frequency component matrices, or is generated by weighted combination of multiple sets of space-frequency basis matrices selected from space-frequency basis matrices. In this embodiment, the space-frequency base matrix is ​​an N×M matrix. Each space-frequency basis vector or each space-frequency component matrix in the set of space-frequency component matrices may be a product of a space-domain basis vector and a conjugate transpose vector of a frequency-domain basis vector.

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Abstract

The embodiment of the invention discloses a channel estimation method and device, relates to the technical field of communication, and helps to reduce indication overhead. The method can comprise thesteps that indication information is generated and sent, the indication information is used for indicating M N-dimensional precoding vectors, each precoding vector is applied to one frequency band inthe M frequency bands, the M N-dimensional precoding vectors form a space frequency matrix, and the space frequency matrix is generated by weighting and combining a plurality of space frequency component matrixes, the space-frequency matrix is an M * N-dimensional space-frequency vector or an X * Y space-frequency matrix, X and Y are respectively one and the other of M and N, the M is greater thanor equal to 1, the N is greater than or equal to 2, and the M and N are integers.

Description

technical field [0001] The present application relates to precoding technology, and in particular to a channel estimation method and device. Background technique [0002] The emergence of 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). The precoding technology uses a precoding matrix that matches a channel to process a spatially multiplexed data stream (hereinafter referred to as a s...

Claims

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Application Information

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IPC IPC(8): H04L25/02
CPCH04B7/0456H04L25/0242H04L25/0246H04B7/0478H04L25/0204H04B7/0417
Inventor 王潇涵金黄平任翔韩玮毕晓艳
Owner HUAWEI TECH CO LTD
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