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Beam training method in millimeter wave system assisted by intelligent reflection surface

A beam training and reflective surface technology, applied in the field of beam training, can solve the problem of rare application of beam training, and achieve the effect of reducing training overhead, low complexity, and ensuring communication quality

Active Publication Date: 2021-08-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the application of beam training in RIS-assisted mmWave communication systems is still very rare

Method used

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  • Beam training method in millimeter wave system assisted by intelligent reflection surface
  • Beam training method in millimeter wave system assisted by intelligent reflection surface
  • Beam training method in millimeter wave system assisted by intelligent reflection surface

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specific Embodiment approach 1

[0133] (1) if figure 1 As shown, the RIS-assisted millimeter wave system model and channel model considered in the present invention are as follows:

[0134] (1.1) The present invention considers a downlink RIS-assisted millimeter-wave system, including a base station BS, a single-antenna user-end UE, an intelligent controller for controlling reflection coefficient, and K blocks of RIS for assisting communication. Both the BS end and each RIS end use a uniform linear array with an element interval of half a wavelength. The number of BS antennas is N BS , the number of reflection units of each RIS is N R . The BS and each RIS are wired to the intelligent controller, so that the BS can control the reflection coefficient of each RIS in real time. Due to the serious path loss in the millimeter wave communication system, the signals reflected twice or more by the RIS are ignored.

[0135] (1.2) Using the Saleh-Valenzuela narrowband channel model, the channel between the BS and...

specific Embodiment approach 2

[0187] For the problem established in step (2.5), in order to improve the efficiency of beam training, the present invention proposes a multicast training scheme that can simultaneously perform beam scanning on multiple paths, as follows:

[0188] (3.1) In the communication system, it is usually considered that the positions of RIS and BS are fixed, so it is assumed that the channel angle of each RIS relative to the BS is known, that is A known. The index of the codeword at the BS that can achieve beam alignment with the k-th block RIS satisfy

[0189]

[0190] Among them, assuming that the number of RIS is limited and uniformly distributed in the space, different from each other.

[0191] (3.2) Divide beam training into N BS cycle. In the i-th period, the codeword to be trained at the BS is f(i).

[0192] (3.3) Judging whether f(i) is consistent with Adjacent, the beamforming vector at the BS end in the i-th period is obtained.

[0193] When f(i) is not with ...

specific Embodiment approach 3

[0212] For the problem established in step (2.5), in order to further improve the efficiency of beam training on the basis of the second specific embodiment, the present invention proposes a layered multicast training scheme, which can perform layered beam training on multiple paths at the same time, as follows Said:

[0213] (3.1) Obtain the codeword index corresponding to the beam that can be aligned with the k-th block RIS at the BS In the communication system, it is usually considered that the positions of RIS and BS are fixed, so it is assumed that the channel angle of each RIS relative to the BS is known, that is A known. The index of the codeword at the BS that can achieve beam alignment with the k-th block RIS satisfy

[0214]

[0215] Among them, assuming that the number of RIS is limited and uniformly distributed in the space, different from each other.

[0216] (3.2) Design BS-side layered codebook and RIS-side layered codebook for layered multicast trai...

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Abstract

The invention discloses a beam training method in a millimeter wave system assisted by an intelligent reflection surface. The beam training method comprises a multicast training scheme and a layered multicast training scheme. The multicast training comprises two stages. In the first stage, a base station and a RIS perform beam scanning at the same time; and the base station carries out beam scanning on a user, simultaneously divides energy to transmit a beam to the RIS, and controls the RIS to carry out beam scanning on the user; and the user determines an optimal scanning result according to the received signal strength. In the second stage, link-by-link beam training is carried out on the optimal scanning result, and an optimal communication link from the base station to the user is determined. On the basis of multicast training, beam scanning in the first stage is changed into layered beam training by layered multicast training, so that the overhead is further reduced. According to the two schemes provided by the invention, the beam training overhead can be reduced while certain performance is ensured.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave wireless communication, and in particular relates to a beam training method in a millimeter wave system assisted by an intelligent reflective surface. Background technique [0002] With the popularity of mobile terminal equipment and the rapid development of emerging technologies such as virtual reality and unmanned driving, people's demand for wireless communication is increasing. To meet the growing needs of people, 5G wireless networks have been deployed in some countries. As one of the key technologies of 5G communication and future wireless communication systems, millimeter-wave MIMO technology has problems such as high energy consumption, high hardware cost and high computational complexity. How to reduce energy consumption and hardware costs while ensuring the communication performance of millimeter wave systems is a key issue for the sustainable development of future wireless netw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0426H04B17/391
CPCH04B7/043H04B17/391
Inventor 戚晨皓黄婧佳阎志恒
Owner SOUTHEAST UNIV
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