基于镜频抑制QPSK的基带信号处理  

QPSK Signal Processing Based on Mirror Frequency Rejection

作　　者：安君帅 戴雪雅 陈章 AN Junshuai;DAI Xueya;CHEN Zhang(Nanjing Panda Handa Technology Co.,Ltd.,Nanjing,Jiangsu 210016,China)

机构地区：[1]南京熊猫汉达科技有限公司,江苏南京210016

出　　处：《信息记录材料》2023年第12期15-18,共4页Information Recording Materials

摘　　要：本文基于中频接收机进行正交相移键控(quadrature phase shift keying, QPSK)解调,使用模拟仿真软件Vivado和MATLAB进行半实物模拟仿真分析,依次实现QPSK解调、模数(analog to digital, AD)采样、成形滤波、载波同步、符号同步、幅相不平衡校正,减弱了中频接收机幅度偏差和相位抖动带来的镜频干扰问题,最终加工出实物电路进行测试分析,测试结果误差向量幅度(EVM)=2.7%,镜像抑制度≥30dB;整个接收系统具有良好的接收能力,具有一定的工程实际意义。This article uses an intermediate frequency receiver for quadrature phase shift keying(QPSK)demodulation,and uses simulation software Vivado and MATLAB for semi-physical simulation analysis.QPSK,demodulation,analog to digital(AD)sampling,shaping filtering,carrier synchronization,symbol synchronization,and amplitude phase imbalance correction are sequentially implemented.The problem of mirror frequency interference caused by amplitude deviation and phase jitter of IF receiver is weakened.Finally,the physical circuit is processed for test and analysis.The test results show that the error vector magnitude(EVM)is 27%,and the image suppression degree is≥30 dB.The entire receiving system has good receiving ability and has certain engineering practical significance.

关 键 词：QPSK解调 载波同步 符号同步 幅相不平衡校正 

分 类 号：TP279[自动化与计算机技术—检测技术与自动化装置]