Hybrid precoding method of millimeter wave large-scale MIMO system

A large-scale, millimeter-wave technology, applied in transmission systems, radio transmission systems, advanced technologies, etc., can solve problems such as difficult to obtain hybrid precoding design solutions, and achieve overcoming spectral efficiency loss, low computational complexity, and high energy consumption problem effect

Active Publication Date: 2021-04-13
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Since the analog precoding is implemented by a phase shifter, the elements of the analog precoding matrix are constrained by a constant modulus, which leads to a non-convex problem in finding the precoding matrix to maximize spectral efficiency, and it is difficult to obtain an optimal hybrid precoding design scheme

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  • Hybrid precoding method of millimeter wave large-scale MIMO system
  • Hybrid precoding method of millimeter wave large-scale MIMO system
  • Hybrid precoding method of millimeter wave large-scale MIMO system

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Embodiment Construction

[0050] The method of the present invention is aimed at the millimeter-wave large-scale MIMO full-connection hybrid architecture, adopts a narrow-band clustering channel model, and the sending end and the receiving end are equipped with uniform planar array (Uniform PlanarArray, UPA) antennas, and the antenna spacing is set to half a wavelength, assuming that the angle of arrival and the azimuth and elevation angles of the departure angle obey 0,2p and The uniform distribution of , the angular extension of both the transmitter and the receiver is 7.5 degrees, assuming that all streams are equal power distribution, the simulation results are the average of the simulation results generated by 200 random channels. The number of iterations is 5, and the system block diagram is as follows figure 1 As shown, the focus of the present invention is the design of the analog and digital precoding matrix at the transmitting end, and the method of the present invention is also applicable t...

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Abstract

The invention discloses a hybrid precoding method for a millimeter-wave large-scale MIMO system, and the method comprises the steps: 1, carrying out the channel modeling, determining a channel matrix H, and carrying out the singular value decomposition of the channel matrix to obtain an optimal unconstrained all-digital precoding matrix; 2, constructing an analog precoding vector by adopting an alternate iteration method; 3, updating a residual matrix Fres by adopting a mode similar to matching pursuit; 4, calculating a digital precoding matrix by adopting a least square method and carrying out normalization processing; and 5, obtaining an analog combination matrix and a digital combination matrix at a receiving end by adopting the same steps. According to the invention, the optimal spectral efficiency close to that of the all-digital precoding method can be obtained with relatively low calculation complexity, so that the channel capacity close to that of all-digital precoding can be obtained, and the energy consumption of a radio frequency chain is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of information and communication engineering, and in particular relates to a millimeter-wave large-scale multiple input multiple output (Multiple Input Multiple Output, MIMO) system hybrid precoding. Background technique [0002] Today's wireless communication system's explosive demand for capacity has made traditional spectrum resources increasingly tight. Millimeter waves can provide abundant frequency band resources and gigabit data rates, and are considered to be the key technology of 5G (5th-Generation). However, the signal propagation of mmWave signals suffers from higher free-space path loss due to the 10-fold increase in frequency compared to current wireless communication systems. Fortunately, the reduction in wavelength enables smaller antenna sizes, allowing a large number of antennas to be packed in the same space. Large arrays enable beamforming gain to compensate for path loss. Furthermore, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0456H04B7/0465Y02D30/70
Inventor 周武旸王发致柴名扬朱超逸
Owner UNIV OF SCI & TECH OF CHINA
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