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Hybrid precoding method of millimeter wave large-scale MIMO antenna system based on gradient descent method

A gradient descent method, antenna system technology, applied in radio transmission system, transmission system, transmission monitoring and other directions, can solve the problems of large performance gap, high cost and power consumption, and achieve the effect of balance limitation problem

Active Publication Date: 2022-05-10
ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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  • Application Information

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Problems solved by technology

However, in the design of mmWave massive MIMO system, it is necessary to consider the excessive power consumption and hardware cost caused by operating multiple antennas on the frequency band, if a pure digital precoder is used, it must spend higher cost and power consumption , so that each antenna corresponds to a radio frequency chain; and if an analog precoder is used, the cost and power consumption can be reduced, because the analog precoder can control the phase of the signal transmitted by each antenna through a phase shifter, thereby improving The shortcomings of the radio frequency chain are overcome, but the performance has a large gap compared with the pure digital precoder

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  • Hybrid precoding method of millimeter wave large-scale MIMO antenna system based on gradient descent method
  • Hybrid precoding method of millimeter wave large-scale MIMO antenna system based on gradient descent method
  • Hybrid precoding method of millimeter wave large-scale MIMO antenna system based on gradient descent method

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Embodiment Construction

[0055] The technical solution of the present invention will be further explained below in conjunction with the accompanying drawings and attached tables.

[0056] The analog part of hybrid beamforming is usually implemented by simple analog components, such as adders and phase shifters, where an analog phase shifter can only change the phase of the signal. Considering the limitation of the modulus component architecture, the analog beamforming matrix has the constraint that the modulus value of the element is fixed. Existing literature mainly studies two widely used analog beamforming architectures: fully connected and partially connected architectures.

[0057] figure 1 Shown is a fully connected architecture, in this architecture, N RF Each RF chain in the RF chain is connected to all transmit antennas N t , in other words, each transmit antenna is also connected to all RF links. However, because the frequency of the millimeter wave band is relatively high, the distance ...

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Abstract

The invention provides a hybrid precoding method of a millimeter wave large-scale MIMO antenna system based on a gradient descent method, and the method comprises the steps: building a millimeter wave large-scale MIMO antenna system model, constructing a channel matrix through employing an extended Saleh-Valenzuela channel model, building a target function, and finally carrying out the optimization of a hybrid precoder through employing the gradient descent method. The performance of the hybrid precoder is close to that of a pure digital precoder, and meanwhile low design complexity and low cost are kept.

Description

technical field [0001] The invention relates to the technical field of multiple-input multiple-output antennas, in particular to a hybrid precoding method for a millimeter-wave massive MIMO antenna system based on a gradient descent method. Background technique [0002] Millimeter wave and massive MIMO are two new technologies in 5G communication systems, and their combination is to use large antenna arrays to provide the bandwidth and spectral efficiency of millimeter wave frequencies. However, in the design of mmWave massive MIMO systems, it is necessary to consider the excessive power consumption and hardware cost caused by operating multiple antennas on the frequency band, and if a purely digital precoder is used, it must spend higher cost and power consumption , so that each antenna corresponds to a radio frequency chain; and if an analog precoder is used, the cost and power consumption can be reduced, because the analog precoder can control the phase of the signal tran...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B7/0456H04B17/391
CPCH04B7/0413H04B7/0456H04B17/391Y02D30/70
Inventor 楚彩虹韦成杰穆中华李丽兰李春莹梁宏伟李珊珊
Owner ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE