A large-scale MIMO reciprocity calibration method based on local calibration

A calibration method and large-scale technology, applied in the field of communication, can solve problems such as loss of calibration accuracy, and achieve the effect of reducing calibration complexity

Active Publication Date: 2020-05-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when using a simpler calibration technique, although the complexity has been greatly reduced, the calibration accuracy is greatly lost.

Method used

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  • A large-scale MIMO reciprocity calibration method based on local calibration
  • A large-scale MIMO reciprocity calibration method based on local calibration
  • A large-scale MIMO reciprocity calibration method based on local calibration

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Embodiment Construction

[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0033] A massive MIMO system with M base station antennas and K user antennas is modeled as figure 1 shown. with H DL Indicates the downlink physical channel gain of the equivalent baseband (from the base station antenna to the terminal antenna), then the integrated downlink channel and uplink channel after cascading the radio frequency transceiver module are as follows:

[0034]

[0035]

[0036] Where T and R represent the equivalent baseband gain matrix of the radio frequency transmitting module and the radio freque...

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Abstract

The invention provides a large-scale MIMO reciprocity calibration method based on partial calibration. The method is applicable to concentrated antenna scenes and distributed antenna scenes, adjacent antennas of a base station are divided into different antenna groups, intra-group partial calibration and inter-group calibration are executed on the different antenna groups, and finally overall calibration is realized. The algorithm has the advantages that no feedback from a client is needed; and the number of antennas involved in the LS calibration is limited within a certain range. In the case of very small calibration accuracy, the calibration complexity can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a large-scale MIMO reciprocity calibration method based on local calibration. Background technique [0002] Due to the characteristics of low cost, anti-fading, and large capacity of radio frequency link modules, the application of massive MIMO technology is becoming more and more extensive. It has become an alternative technology for future cellular networks and 5G communications. In actual communication, massive MIMO systems often need to obtain downlink channel information (CSI) for precoding and realizing system functions. [0003] In Time Division Duplex (TDD) mode, the sending and receiving channels are loaded on the same carrier frequency, and the uplink and downlink channels are separated by a guard time interval. In the overall TDD system, the channel between the base station and the user uses the same carrier frequency, so the uplink and downlink chan...

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 刘羽周世东
Owner TSINGHUA UNIV
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