Calibration device and calibration method of multi-input multi-output (MIMO) terminal

Abstract

The invention provides a calibration device and a calibration method of a multi-input multi-output (MIMO) terminal. The calibration device comprises a second antenna port, a feedback module, a radio frequency receiving module, a comparison module, a distortion degree determination module and a predistortion treatment module, wherein the feedback module is used for feeding back an output signal ofa radio frequency emission module to the second antenna port; the radio frequency receiving module is used for obtaining a digitized feedback signal; the comparison module is used for comparing the feedback signal with an input signal and determining whether a power amplifier works in a nonlinear area or not according to a comparison result; the distortion degree determination module is used for determining the distortion degree of the feedback signal when the power amplifier works in the nonlinear area; and the predistortion treatment module is used for adjusting a predistortion coefficient according to the distortion degree when the power amplifier works in the nonlinear area so as to obtain a calibrated predistortion coefficient. The calibration device can be utilized to calibrate a predistortion coefficient lookup table so as to ensure that the MIMO terminal can carry out predistortion treatment by utilizing the calibrated predistortion coefficient lookup table in a working process so as to improve the linear performance of the power amplifier.

Description

Technical field [0001] The present invention relates to the field of mobile communications, in particular to a calibration device and a calibration method for a multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) terminal. Background technique [0002] In the field of mobile communications, the 3GPP Long Term Evolution LTE technology has received widespread attention because it represents the direction of 3G subsequent evolution. LTE's support for variable channel bandwidth requires that the amplifier be placed in a wider frequency band to achieve high linearity. The application of OFDM technology in LTE will also greatly improve the peak-to-average ratio of the entire system, which all raises the linearity of the amplifier. Requirements. In addition, modulation methods such as 64QAM used in LTE also have higher requirements on the linearity of the system. From the above analysis, we can find that it is very meaningful to improve the linearity of the system as...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a calibration device and a calibration method for a multi-input multi-output terminal to solve the technical problem of using pre-distortion technology in mobile terminals to improve the linearity performance of the system

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