Software radio technology offers a feasible method to solve this problem so as to become a focus of research. 软件无线电技术为解决上述问题提供了一个可行的方法，成为人们研究的热点。
The paper provides a new thought and solution based on the research of the IF modulator and demodulator of Software Radio. 本文在对软件无线电中频调制解调器研究的基础上，提出了一种新的思路和解决方法。
