A Dynamic User Hybrid Precoding Method for Millimeter Wave Systems

A system dynamic, millimeter wave technology, applied in transmission systems, radio transmission systems, transmission monitoring, etc., can solve the impact of hybrid precoding algorithms and rate performance user status, traditional algorithms are not suitable for dynamic user scenarios, and it is difficult to maintain expected performance and other problems to achieve the effect of extending the training period

Active Publication Date: 2021-08-24
XIDIAN UNIV
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Problems solved by technology

[0004] However, traditional hybrid precoding algorithms only consider optimizing the sum rate performance of static users and simplifying the computational complexity in the design process of static user hybrid precoding matrix
When there are dynamic users in the system, the sum rate performance of the traditional hybrid precoding algorithm will be easily affected by the user status in the system
Therefore, the above traditional algorithms are not suitable for dynamic user scenarios, or it is difficult to maintain their expected performance

Method used

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  • A Dynamic User Hybrid Precoding Method for Millimeter Wave Systems
  • A Dynamic User Hybrid Precoding Method for Millimeter Wave Systems
  • A Dynamic User Hybrid Precoding Method for Millimeter Wave Systems

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Embodiment 1

[0138] See figure 1 , figure 1 It is a system model diagram provided by the embodiment of the present invention. As shown in the figure, the millimeter wave communication system used in this embodiment is composed of the millimeter wave part connected to the antenna array base station, the transmission channel and the user. Base station has transmitting sub-arrays, each transmitting sub-array has N antennas, and the base station has a total of There are M users in the system, and each user has receiving sub-arrays, each transmitting sub-array has N antennas, and each user has root receiving antennas, where each antenna is independent of each other, and the distance between adjacent antennas is Each user state is random, including four states: static, moving, blocked, and blocked+moving.

[0139] See figure 2 , figure 2 It is a flowchart of a method for dynamic user hybrid precoding of a millimeter wave system provided by an embodiment of the present invention. As...

Embodiment 2

[0269] This embodiment is a simulation experiment of the method for dynamic mixed user precoding in the millimeter wave system in Embodiment 1. The simulation conditions of this embodiment are: the base station has 15 transmitting sub-arrays, each transmitting sub-array has 20 antennas, there are 5 users in the system, each user has 3 receiving sub-arrays, and each receiving sub-array has 20 antennas. root antenna, the Rice factor K is 7dB, and the transmitted power of each signal is unit power.

[0270] See image 3 and Figure 4 ,in, image 3 For adopting the method of the present invention and adjacent cooperative sub-arrays are N c = 2 and the contrast figure of the beam pattern figure that does not adopt the method of the present invention; Figure 4 For adopting the method of the present invention, the adjacent cooperative sub-matrix is ​​N c = 2 and N c = 3 beam pattern diagram comparison chart. Such as image 3 shown, using N c =2 The beam of the inventive met...

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Abstract

The present invention relates to a method for dynamic user hybrid precoding of a millimeter wave system, comprising: obtaining channel state information of each user, and storing the channel state information of adjacent time slots of each user in a storage unit; according to the stored channel state information, to obtain the optimal propagation path for each user; to judge whether the optimal propagation path is a direct path, to obtain the judgment result of each user; to obtain the state of each user according to the judgment result; Coding matrix; design the user's digital precoding matrix according to the analog precoding matrix; perform data transmission according to the analog precoding matrix and the digital precoding matrix. The method of the present invention can obtain the state of each user only by comparing and judging the channel state information of adjacent time slots of the user, which improves the efficiency of user state detection and reduces the complexity of detection, and according to the detected real-time state of the user , an adaptive hybrid precoding method is proposed.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for dynamic user mixed precoding of a millimeter wave system. Background technique [0002] As one of the key technologies of the fifth-generation mobile communication system, millimeter wave can effectively solve the problem of global frequency band shortage and greatly improve system transmission speed and spectrum efficiency. However, the sparse channels and narrow beams in mmWave systems make their performance highly susceptible to the influence of user states in the system. For example, when the millimeter wave beam is blocked by the human body, about 35dB of beam gain will be lost. In addition, when the user moves, the mmWave beam gain will also suffer varying degrees of attenuation. [0003] Aiming at the problem of precoding in the millimeter-wave partially connected antenna array system, many scholars have conducted in-depth research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0456H04B17/309
CPCH04B7/0456H04B17/309
Inventor 宫丰奎陈翔侯俊贾铁燕李果
Owner XIDIAN UNIV
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