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Distributed-MIMO-oriented antenna calibration sequence sending method and system

A technology of antenna calibration and calibration sequence, which is applied in the direction of radio transmission system, transmission system, transmitter monitoring, etc., can solve the problems of reduced transmission efficiency, reduce the cycle, improve the transmission efficiency of the whole network, and reduce the time to stop sending and receiving terminal data Effect

Active Publication Date: 2020-11-17
BEIJING UNIV OF POSTS & TELECOMM
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a method and system for sending a calibration sequence in a distributed large-scale multiple-input multiple-output scenario to solve the problem of reduced transmission efficiency that may exist in the application of existing calibration schemes in 5G asynchronous TDD systems

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  • Distributed-MIMO-oriented antenna calibration sequence sending method and system
  • Distributed-MIMO-oriented antenna calibration sequence sending method and system
  • Distributed-MIMO-oriented antenna calibration sequence sending method and system

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Embodiment Construction

[0037] The inventor noticed during the invention that: if figure 1 In the distributed large-scale multiple-input multiple-output array scenario shown, considering that the RF (radio frequency, Radio Frequency) link mismatch at the radio frequency unit has the greatest impact on system performance and the calibration scheme using user feedback is extremely expensive, the radio frequency unit under the DMIMO system Inter-antenna calibration is usually accomplished by sending and receiving calibration sequences between radio frequency units.

[0038] In the design of the 5G asynchronous TDD system, consider the user's real-time uplink and downlink data transmission requirements, and realize the dynamic ratio of uplink and downlink transmission time slots. Adjacent RF units may serve different users, as shown in the figure. Unit B will be in different time slots for uplink and downlink or silence. When there is a calibration relationship between radio frequency unit A and radio fr...

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Abstract

The invention discloses a distributed-MIMO-oriented antenna calibration sequence sending method and system. The method comprises the following steps: enabling a radio frequency unit to determine a calibration sequence needing to be sent and radio frequency units for receiving the calibration sequence, wherein each radio frequency unit consists of a distributed MIMO DMIMO networking technology; determining a calibration relationship among the radio frequency units for sending and receiving the calibration sequence according to an initially set antenna calibration method; enabling the radio frequency units with the calibration relationship to send / or receive the calibration sequence according to the calibration sequence sending rule, and to update the calibration factor; and recording the number of the radio frequency units for updating the calibration factor in the initially set calibration period, and dynamically adjusting the antenna calibration period according to a predetermined threshold value. By adopting the method and the device, the calibration sequence can be sent by utilizing the silent time slot between downlink and uplink in a 5G asynchronous TDD system, so that the antenna calibration period is dynamically adjusted, and the transmission efficiency is improved in a multi-node cooperation scene.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to antenna calibration of an asynchronous TDD system in a fifth generation mobile communication system (the 5th generation, referred to as 5G for short). Background technique [0002] In order to meet the demand for fast-growing wireless data services in the future, Massive MIMO (Massive Multiple-Input Multiple-Output) technology has attracted extensive attention. Massive MIMO technology has obvious advantages in enhancing spectrum and energy efficiency. , supports large data vector dimensions to provide high-speed and reliable data communication. The distribution characteristics of base station antenna positions can divide massive MIMO into two types: centralized and distributed. Among them, distributed massive MIMO technology (DMIMO) can make full use of the spatial characteristics of the channel, effectively improve the transmission rate of the system, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B17/11H04B17/21
CPCH04B7/0413H04B17/11H04B17/21
Inventor 张鸿涛武丹阳陈雨晴赵嘉怡
Owner BEIJING UNIV OF POSTS & TELECOMM
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