To validate the theoretical analysis, a test system for group velocity delay was set up based on RF modulation.
为了验证理论分析，设计了射频调制法测试介质膜滤波器群速度延时的实验装置。
2
In WCDMA system, downlink base band modulation involves a lot of channels and complex functions, resulting in prolonged time and higher costs for test and verification.
WCDMA中下行链路基带调制信道多，功能复杂，对其测试和验证所花费的时间和费用也随之提高。
3
The test Method of modulation transfer function (MTF).