调制信号的解调算法与基于LABVIEW的实现  

Signal demodulation algorithm of complex modulation signal and implementation based on LabVIEW

作　　者：居滋培[1] 董大伟[1] 凌奕枫[1] 白凌[1] 华闫祺[1] 

机构地区：[1]上海理工大学计算机与电气工程学院,上海200031

出　　处：《电子测量技术》2008年第12期54-58,共5页Electronic Measurement Technology

摘　　要：介绍了调幅、调频的解调算法,对比了相干解调和非相干解调算法,并在相干解调算法的基础上,提出了正交解调算法和正切解调算法。利用LabVIEW数据流图的编程方式,编程得到二次正交解调算法,实现复合调制信号的数字化解调。通过仿真与实验结果可以得知,采用二次正交解调算法对复合调制信号进行数字解调能够得到较好的解调效果。Focusing on the two issues of the algorithm for complex modulation signal＇s demodulation and the software implementation, this paper introduces the demodulation algorithm for amplitude and frequency modulation, compares the coherent demodulation algorithm with non-coherent and proposes the quadrature demodulation algorithm and the tangent demodulation algorithm based on the coherent demodulation algorithm. Using the data flow diagram programming of LabVIEW, this paper implements the second quadrature demodulation algorithm and achieves the complex modulation signal＇s digital demodulation. Throughout the result of simulation and experiment, we conclude that it can get better result of complex modulation signal＇s digital demodulation using the second quadrature demodulation algorithm.

关 键 词：复合调制信号 数字解调 LABVIEW 仿真 

分 类 号：TM92[电气工程—电力电子与电力传动]