Semi-blind channel estimation method suitable for a large-scale MIMO system assisted by intelligent reflecting surface

A reflective, large-scale technology, applied in the field of information and communication, can solve problems such as large pilot overhead

Active Publication Date: 2021-03-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0004] However, the existing channel estimation methods for RIS-assisted MIMO systems are all completely pilot-based methods, which require a large pilot overhead

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  • Semi-blind channel estimation method suitable for a large-scale MIMO system assisted by intelligent reflecting surface
  • Semi-blind channel estimation method suitable for a large-scale MIMO system assisted by intelligent reflecting surface
  • Semi-blind channel estimation method suitable for a large-scale MIMO system assisted by intelligent reflecting surface

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Embodiment Construction

[0088] The present invention will be described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention.

[0089] It is assumed that the number of base station antennas is M=256, the number of smart reflector antennas is N=128, and the number of users is K=20. The switch state matrix S of the smart reflective surface is set to a 0-1 Bernoulli distribution matrix, and the sampling rate (sparseness) is 0.3, that is, 0.3*M*N elements in S are 1, and the rest are all 0 elements . The transmission data at the user end is a quadrature phase-shiftkeying (QPSK) symbol. Let the channel matrices G and F be Rayleigh fading channels with zero mean and variance 1. Then implement semi-blind channel estimation according to the message passing algorithm in steps S21-S215 of the technical solution of the present invention. All simulation results are obtained through 200 Monte Carlo independent experiments. ...

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Abstract

The invention belongs to the technical field of information and communication, and relates to a semi-blind channel estimation method suitable for a large-scale MIMO system assisted by an intelligent reflecting surface. In order to reduce the pilot overhead of a sending end and improve the channel estimation precision, the invention provides a semi-blind channel estimation method for Bayesian approximate message passing by solving the problem of trilinear matrix decomposition, i.e., only part of sequences in sending symbols are used as pilot symbols. According to the method disclosed by the invention, the maximum calculation overhead of each iteration is only the product operation of the matrix and the vector, the calculation complexity and expandability are relatively low, relatively accurate channel estimation can be obtained under the condition of a small number of pilot frequencies, and meanwhile, unknown symbol sequences of a part of sending ends are detected.

Description

technical field [0001] The invention belongs to the technical field of information and communication, and relates to a semi-blind channel estimation method for a large-scale MIMO system assisted by an intelligent reflection surface. Background technique [0002] In recent years, as a novel solution to improve the energy and spectrum efficiency of wireless networks, Reconfigurable Intelligent Surface (RIS) has attracted extensive attention from academia and industry. The smart reflector is a super-panel low-power device composed of a large number of low-cost, reconfigurable reflective elements. These reflective elements can change the propagation environment of electromagnetic waves with controllable phase shift reflections, and greatly reduce the performance of wireless communication networks. Consumption and significantly improve spectrum utilization, thus showing the potential to completely revolutionize wireless communication networks. By deploying and controlling the ph...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/0204H04L25/0238H04L25/0246H04L25/0224
Inventor 袁晓军何振清
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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