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Low-frequency auxiliary hybrid precoding design method based on beam selection

A technology that assists mixing and design methods, applied to radio transmission systems, electrical components, transmission systems, etc., can solve the problems of increasing the complexity of millimeter wave channel estimation and speeding up channel estimation, etc.

Active Publication Date: 2020-11-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, due to the deployment of large-scale antenna arrays, the complexity of millimeter-wave channel estimation has been greatly increased. Based on the spatial similarity between the low-frequency band and the millimeter-wave frequency band, researchers proposed to use low-frequency information to restore the spatial information of millimeter-wave, thereby speeding up the process of channel estimation.

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  • Low-frequency auxiliary hybrid precoding design method based on beam selection
  • Low-frequency auxiliary hybrid precoding design method based on beam selection
  • Low-frequency auxiliary hybrid precoding design method based on beam selection

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Embodiment Construction

[0034] Next, the technical solution of the present invention will be described in detail in conjunction with the accompanying drawings.

[0035] S1, the system model and optimization goals

[0036] Single-cell multi-user system of the present invention contemplates a millimeter wave downlink, wherein the base station has M antennas and N RF chains, serving the K single-antenna user, such as Picture 1-1 Indicated. In the structure of the mixed precoded data stream First, a digital baseband precoder Treatment. Then the BS through the RF chain signal to an RF frequency domain. Thereafter, the analog precoder Signal is mapped to the antenna. The present invention is defined by the number of RF chains equals the number of users, i.e., N = K. Millimeter-wave systems use a fixed beam switching system during a data transfer from one set of beams is preset to select the optimal codebook vector precoding analog communication, it is assumed that a DFT codebooks beam codebooks.

[0037] Si...

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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a low-frequency auxiliary hybrid precoding design method based on beam selection. A zero-forcing algorithm is applied to a digital domain part to eliminate multi-user interference, and an analog domain selects a beam set enabling the system capacity to be maximum through codebook-based beam search.Five low-frequency assisted beam selection methods are provided on the basis of constructing a millimeter wave and low-frequency band heterogeneous communication network and carrying out beam selection by utilizing low-frequency information. Based on the spatial similarity of a low-frequency band and millimeter waves, firstly, an optimal low-frequency beam set is obtained by utilizing low-frequency spatial information, and then millimeter wave beams contained in the low-frequency beam width are trained, so that the optimal beam set of a millimeter wave system is obtained.

Description

Technical field [0001] The present invention belongs to the technical field of wireless communication, particularly relates to an auxiliary low-frequency mixing pre-coding method based on the design of beam selection. Background technique [0002] In order to meet the growing demand for wireless communication data transmission, millimeter wave spectrum with its abundant resources and greater communications bandwidth has become a major subject of the current communication technology. To compensate for millimeter-wave band high path loss, researchers have proposed a large-scale antenna array configured by the base station side and the UE, to provide a high beam gain and spatial multiplexing gain. To improve the energy efficiency of the communication system, the base station end of a precoding scheme designed estimation information according to channel, so that the directivity of the signal sent to more users, to reduce energy loss. However, due to the deployment of large-scale ante...

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Application Information

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IPC IPC(8): H04B7/0456
CPCH04B7/0456
Inventor 刘红李军张忠培
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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