数字正交FM解调方案门限效应的研究

介绍了FM解调方案的门限效应。针对传统调频解调方案中的解调门限值高以及降低解调门限的方案难以实现的不足,在研究传统模拟调频解调方案的基础上,分析了数字FM解调方案的门限性能。理论推导证明,数字正交FM解调方案的门限效应低于模拟解调方案。因此,可以采用数字正交解调方案降低其解调门限,而不需采用较难设计和控制的反馈系统,这极大地降低了调频系统实现的复杂度。最后计算机仿真的结果显示,该方案比传统模拟解调方案门限约低2dB。

The Research on Threshold Effects of a Digital Quadrature FMDemodulation

This paper introduced the threshold effect of FM demodulation.In view of the high threshold of traditional FM demodulation and the realization of those programs decreasing the threshold,the threshold effect of digital FM demodulation which was based on the research of the digital FM demodulation performance of the threshold was analyzed.From theoretical derivation,threshold of the digital orthogonal FM demodulation was less than the analog demodulation scheme.Therefore,we can reduce the threshold by digi-ta...