Antenna calibration sequence transmission method and system for distributed MIMO

An antenna calibration and calibration sequence technology, applied in radio transmission systems, transmission systems, transmitter monitoring and other directions, can solve problems such as the reduction of transmission efficiency, and achieve the effect of reducing cycle, avoiding interference, and improving transmission efficiency of the entire network.

Active Publication Date: 2022-03-25
BEIJING UNIV OF POSTS & TELECOMM
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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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  • Antenna calibration sequence transmission method and system for distributed MIMO
  • Antenna calibration sequence transmission method and system for distributed MIMO
  • Antenna calibration sequence transmission method and system for distributed MIMO

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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, comprising: a radio frequency unit determines the calibration sequence to be sent, and a radio frequency unit that receives the calibration sequence, wherein each radio frequency unit operates according to the distributed multiple input multiple Composed of output DMIMO networking technology, the calibration relationship between the radio frequency units that send and receive the calibration sequence is determined according to the initially set antenna calibration method; the radio frequency unit that has the calibration relationship sends / receives the calibration sequence according to the calibration sequence transmission rule, and performs calibration factor update; record the number of radio frequency units that update the calibration factor within the initially set calibration period, and dynamically adjust the antenna calibration period according to a predetermined threshold. By adopting the present invention, the 5G asynchronous TDD system can use the silent time slot between the downlink and the uplink to send the calibration sequence, and then dynamically adjust the antenna calibration period, and improve the transmission efficiency in the multi-node cooperation scenario.

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 Patents(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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