基于前后向线性预测的宽带零中频IQ不平衡校准算法

打开文本图片集

本文引用格式：，，，等.基于前后向线性预测的宽带零中频 IQ 不平衡校准算法[J].自动化与信息工程，2025， 46（3）：1-8. WANG Zongwei， FAN Chao，GENG Jianqiang，et al. Wideband zero intermediate frequency IQ imbalance calibration algorithm based on forward and backward linear prediction[J].Automation & Information Engineering， 2025，46（3）：1-8.

关键词：宽带零中频接收机；IQ不平衡校准；前后向线性预测；差异滤波器；本振相位差中图分类号：TN929.5;TN911.7 文献标志码：A 文章编号：1674-2605（2025）03-0001-08DOI： 10.12475/aie.20250301 开放获取

Wideband Zero Intermediate Frequency IQ Imbalance Calibration Algorithm Based on Forward and Backward Linear Prediction

WANG Zongwei1FAN Chao1GENG Jianqiang1CHENG Liyan² （1.Chengdu Corpro Technology Co.，Ltd.， Chengdu 610oo0， China 2.School of Integrated Circuit Science and Engineering， University of Electronic Science and Technology of China， Chengdu 610ooo， China）

Abstract： To addresstheissue of signal demodulation impairment caused by IQ imbalance in wideband zero-IFreceivers，a widebandzero intermediatefrequencyIQimbalancecalibrationalgorithmbasedon forwardand backward linear prediction is proposed.First，thefrequency-dependentimpulseresponsecharacteristicsoftheIandQbranchesareestimatedbyminimizingthe sumof meansquared forward-backward linear predictionerors.Then，thediferentialfiltercoeficientsarecomputedrecursively. FinalythelocaloscilatorpaseismatchisiatedbasedontecondordersatisticalpropertiesoftigaladQ imbalancecompensationisimplementedinthedigitaldomain.SimulationresultsdemonstratethatcomparedwiththeSAM algorithmand TPMalgorithm，the proposedalgorithmachievessuperior imagerejectionratioand vector magnitudeerror. Experimentalresultsfurtherconfimthathealgorithmfeaturessmpleimplementationandefectivelyenhancessignaldemodulation performance.

Keywords：wideband zero intermediate frequencyreceiver; IQ imbalance calibration; forwardand backward linear predic. tion; difference filter; local oscillator phase difference

0 引言

在现代通信系统中，宽带零中频架构因成本低、高效被广泛应用于射频收发机设计[1-3]。（剩余8894字）