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Digital-analog hybrid pre-distortion structure for MIMO transmitter

A digital-analog hybrid and digital pre-distortion technology, which is applied in the direction of improving amplifiers to reduce nonlinear distortion, parts of amplification devices, electrical components, etc., to achieve the effects of reducing volume, simplifying implementation methods, and reducing costs

Pending Publication Date: 2020-04-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

Since multiple power amplifiers do not always use the same device, the digital predistorter (DPD) module needs to be individually designed according to the characteristics of each power amplifier. A multi-channel predistortion scheme with a distorter and an analog predistorter, n channels require n digital predistorters and n analog predistorters (APD), so the implementation cost becomes the biggest problem

Method used

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  • Digital-analog hybrid pre-distortion structure for MIMO transmitter
  • Digital-analog hybrid pre-distortion structure for MIMO transmitter
  • Digital-analog hybrid pre-distortion structure for MIMO transmitter

Examples

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Embodiment 1

[0022] A new digital-analog hybrid predistortion structure for MIMO transmitters, which only has a single-channel analog beamforming unit, and its structural block diagram is shown in figure 1 As shown, there are mainly eight modules:

[0023] Digital precoding: the main function is to use clutter suppression interferometry CSI (Clutter Suppression Interferometry) on the transmitting end of the downlink to use the precoding matrix to process the modulated symbol stream on the transmitted signal, and input it into the digital predistorter.

[0024] Digital predistorter: It is composed of a lookup table or polynomial. Its main function is to reprocess the signal processed by the precoding matrix to compensate the dynamic nonlinear distortion of the power amplifier and output it to D / A conversion.

[0025] D / A conversion: It is composed of a digital-to-analog converter DAC (digital analog converter). The main function is to convert the output signal of the digital predistorter fr...

Embodiment 2

[0033] A new digital-analog hybrid predistortion structure for MIMO transmitters, with n-way analog beamforming units, its structure block diagram is as follows figure 2 As shown, there are mainly eight modules:

[0034] Digital precoding: the main function is to use clutter suppression interferometry CSI (Clutter Suppression Interferometry) on the transmitting end of the downlink to use the precoding matrix to process the modulated symbol stream on the transmitted signal, and input it into the digital predistorter.

[0035] Digital predistorter: It is composed of a lookup table or polynomial. Its main function is to reprocess the signal processed by the precoding matrix to compensate the dynamic nonlinear distortion of the power amplifier and output it to D / A conversion.

[0036] D / A conversion: It is composed of a digital-to-analog converter DAC (digital analog converter). The main function is to convert the output signal of the digital predistorter from digital to analog a...

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Abstract

The invention provides a digital-analog hybrid pre-distortion structure for an MIMO transmitter, and belongs to the technical field of power amplifier linearization. According to the invention, on thebasis of a pre-distortion scheme adopted in a traditional multiple-input-multiple-output transmitter, a pre-distortion scheme is adopted, a public digital predistorter is used, and a plurality of analog pre-distorters are arranged behind the analog pre-distorters; meanwhile, designed analog pre-distortion consistency detection and analog pre-distortion consistency adjustment are added, and a feedback loop output by the power amplifier is compensated to each analog pre-distorter; the units are cascaded to form a digital-analog hybrid pre-distortion structure, so the novel digital-analog hybridpre-distortion structure for the MIMO transmitter is low in cost and good in linearization effect.

Description

technical field [0001] The invention belongs to the technical field of linearization of power amplifiers, and specifically designs a novel digital and analog hybrid predistortion structure for a hybrid beamforming MIMO transmitter. Background technique [0002] With the change of the times, the current wireless communication technology has entered the period of rapid development of the fifth generation. Due to the increase in communication rate and the need to increase spectrum utilization, the currently used high-band utilization modulation methods often have the characteristics of peak-to-average ratio, which will bring challenges to the trade-off between efficiency and linearity. As a key device in the communication link, the power amplifier's nonlinear characteristics will have a negative impact on the performance of the communication system, which requires a higher linearity in the output of the power amplifier. [0003] At present, many power amplifier linearization t...

Claims

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3241Y02D30/70
Inventor 游飞谭松李草禹郝鹏何松柏
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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