Large-scale multi-input-and-output channel estimation method and device

A channel estimation and multi-input technology, which is applied in the field of mobile communication, can solve the problems of limiting spectrum efficiency and increasing pilot overhead, and achieve the effect of saving channel time-frequency resources

Inactive Publication Date: 2017-10-20
BEIJING XINWEI TELECOM TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In a massive MIMO system, when the number of antennas increases, in order to estimate the complete channel state, the existing channel estimation methods require the transmission time of the pilot signal to increase accordingly, resulting in an increase in pilot overhead and limiting the spectrum Efficiency improvement

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  • Large-scale multi-input-and-output channel estimation method and device

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no. 1 example

[0022] This embodiment provides a technical solution of a large-scale multiple-input multiple-output channel estimation method. The large-scale MIMO channel estimation method is executed by a large-scale MIMO channel estimation device, and the large-scale MIMO channel estimation device is integrated in a mobile station.

[0023] see figure 1 , the large-scale multiple-input multiple-output channel estimation method includes:

[0024] S11. Receive pilot signals on multiple subcarriers.

[0025] For simplicity of description, it is assumed that a mobile station is equipped with one antenna, and the mobile station receives a pilot signal using this antenna.

[0026] In order to perform accurate channel measurement, a part of subcarriers is selected from subcarriers corresponding to different antennas. When sending pilot signals, the base station sends pilot signals for channel measurement on these subcarriers. The pilot signal is also called a preamble signal, which is a sign...

no. 2 example

[0060] This embodiment provides a technical solution of a large-scale multiple-input multiple-output channel estimation method. In this technical solution, the large-scale multiple-input multiple-output channel estimation method includes: the mobile station uses the OMP algorithm to recover the frequency domain channel information on the subcarrier where the pilot frequency is located; For channel information in the frequency domain, the OMP algorithm is used to restore the channel information of all antennas on all subcarriers.

[0061] see image 3 , the large-scale multiple-input multiple-output channel estimation method is executed cooperatively by the base station and the mobile station. Specifically, the large-scale multiple-input multiple-output channel estimation method includes:

[0062] S31. The base station determines the number of subcarriers occupied by the pilot signal according to the sparsity of the multipath dimension of the channel matrix.

[0063] Specifi...

no. 3 example

[0079] This embodiment provides a technical solution of a large-scale MIMO channel estimation device. see Figure 4 , in this technical solution, the large-scale MIMO channel estimation device includes: a signal receiving module 41 and a matrix restoration module 42 .

[0080] The signal receiving module 41 is used for receiving pilot signals on multiple subcarriers.

[0081] The matrix recovery module 42 is used to restore the channel matrix in the frequency domain of the subcarriers occupied by the pilot by compressing the sparse representation of the channel digital cosine transform DCT domain according to the strong correlation between the antennas, and using the time domain of the channel Sparse feature, recovering the channel matrix of all subcarriers.

[0082] Wherein, the plurality of subcarriers are some subchannels of all subcarriers in the massive multiple-input multiple-output, and the time-domain channel matrix is ​​a sparse matrix.

[0083] Optionally, the tim...

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Abstract

An embodiment of the invention discloses a large-scale multi-input-and-output channel estimation method and device. The method includes receiving pilot signals on a plurality of sub carriers; according to high relevance among antennas, restoring a frequency domain channel matrix of sub carriers with pilot occupancy through a compressed sensing algorithm and restoring channel matrix of all the sub carriers by utilizing a feature of time domain sparsity of channels. By adopting the method and device provided by the invention, channel time frequency resource occupied by the pilot signals during a channel estimation process is saved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of mobile communications, and in particular to a large-scale multiple-input multiple-output channel estimation method and device. Background technique [0002] In recent years, with the rapid development of the mobile Internet, applications such as wireless multimedia services continue to appear, making people have higher requirements for high-speed data transmission. As a new wireless communication system, Massive multiple input multiple output (Massive multiple input multiple output, massive MIMO) system has received extensive attention and has gradually become a research hotspot. While retaining the advantages of the traditional MIMO system, the massive MIMO system makes full use of the multipath effect of the channel, so that the system noise and irrelevant interference are gradually averaged, so as to increase the Signal to Interference plus Noise Ratio (SINR, SINR), at the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L5/00
CPCH04L25/0204H04L5/0048H04L25/022H04L25/0224
Inventor 马大为孙鹏
Owner BEIJING XINWEI TELECOM TECH
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