宇航计测技术 ›› 2023, Vol. 43 ›› Issue (1): 22-29.doi: 10.12060/j.issn.1000-7202.2023.01.05

• 量值传递技术 • 上一篇    下一篇

一种校准空口误差矢量幅度的辐射信号产生方法

王晨曦，杨春涛，马红梅，龚鹏伟，姜河   

  1. 北京无线电计量测试研究所，北京 100039
  • 出版日期:2023-02-25 发布日期:2023-04-12
  • 作者简介:王晨曦（1998-），男，硕士在读，主要研究方向：信号产生与处理技术。

A Method of Radiation Signal Generation for Calibrating Error Vector Magnitude Over-the-air

WANG Chen-xi,YANG Chun-tao,MA Hong-mei,GONG Peng-wei,JIANG He   

  1. Beijing Institute of Radio Metrology and Measurement,Beijing 100039,China
  • Online:2023-02-25 Published:2023-04-12

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摘要： 新一代通信技术愈发依赖毫米波信号，空口条件下毫米波信号质量的校准成为亟需解决的问题。在此背景下提出了一种用于空口毫米波信号误差矢量幅度（Error Vector Magnitude，EVM）参数校准的W频段宽带矢量调制辐射信号产生方法，可以提供高载频、高传输速率的宽带矢量调制信号，为毫米波接收设备EVM参数的校准提供标准信号。使用倍频加混频的方式，获得符号速率1 GBaud（500 MBaud）的W频段正交相移键控（Quadrature Phase Shift Keying，QPSK）矢量调制信号，通过天线辐射到空间传输。接收天线在远场条件处对信号进行接收，经过下变频后得到载频1 GHz的QPSK接收信号，解调后信号的EVM约为20 %@1 GBaud（10 %@500 MBaud）。为提高接收信号质量，研究了相应的预失真与信号平均技术，通过结合发射接收信号来估计传输链路误差并进行迭代补偿，将EVM最低降低到5.2 %@1 GBaud（2.1 %@500 MBaud），大幅度地提高了信号质量，为空口EVM参数校准提供了高质量的辐射信号。

关键词: 宽带矢量调制信号, 空口, 误差矢量幅度, 预失真

Abstract: The next-generation communication technology more and more relies on millimeter-wave signal,so the calibration of millimeter-wave signal quality over the air becomes a problem that is urged to solve.In this context,we proposed a W-band wideband vector modulated radiated signal generation method for EVM calibration of OTA millimeter-wave signal and it can provide standard wideband vector modulated signals with high carrier frequency,high transmission rate for EVM calibration of millimeter-wave receivers.By the use of frequency multiplication and frequency mixing,we obtain W-band wideband QPSK vector modulated signals with 1 GBaud(500 MBaud)symbol rate,and then transmit it into the space using an antenna.The receiving antenna receive the signal at the far-filed condition and by the use of down-converter,we finally get the received QPSK signal with 1 GHz carrier.After demodulation the EVM of the signal is about 20 %@1 GBaud(10 %@500 MBaud).To improve the quality of the received signal,we use proper predistortion technology and signal-averaging technology.We estimate the system error combining the transmitted and received signals and then compensate it using iteration method,the EVM drops minimally to 5.2 %@1 GBaud(2.1 %@500 MBaud)which indicates that the signal quality improves significantly.The predistortion signal can be used as high-quality radiated signal for OTA EVM calibration.

Key words: Wideband vector modulated signal, Over-the-air, Error vector magnitude, Predistortion

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