一种零中频发射反馈镜像及直流联合跟踪校正算法

A Joint Tracking Calibration Algorithm for IQ Imbalance and LO Leakage of ZIF Transmitter and Observation Receiver

针对零中频架构固有的镜像和直流失真问题,提出一种零中频发射反馈镜像和直流失真联合校正算法,通过不同的发射和反馈本振设置,从频率维度将发射镜像和反馈镜像、发射直流和反馈直流区分开,并使用业务信号进行在线训练,保证业务连续性,无需中断业务。上板测试表明,该算法能将发射和反馈镜像及直流稳定校正到底噪之下,明显改善了零中频架构的镜像和直流指标。

A joint tracking calibration algorithm is proposed for ZIF transmitter and observation receiver with IQ imbalance and LO leakage.The algorithm uses different transmitter and observation receiver LO frequency,which ensures that IQ imbalance and LO leakage of the transmitter path are not aligned with those of the observation receiver path in frequency.The algorithm utilizes normal traffic data to calculate updated corrected coefficients without interrupting the service.Finally,the onboard test indicate that the IQ imbalance and LO leakage are compensated to ground noise level,which greatly improves the performance of ZIF transmitter and observation receiver.