**5.1.1 System noise measured with spectrum analyzer**


Fig. 24. System noise measured with spectrum analyzer.

## **5.1.2 System noise measured with WWAN card**

In practice, it is more reasonable to measure system noise with a WWAN card because the RSSI is ready to appear at I/Q demodulator output, since it is the same sampling clock and module size for WWAN communication. The noise power measured from RSSI of WWAN add-on card can therefore in compliance with the definition of N0. The testing configuration and measurement are both shown in Figure 25.

Fig. 25. Test configuration and system noise measured with WWAN card.

The SNA option shown in Figure 26 can also provide the De-Sense Measurement function. The software provides the Base-Station simulator, and provides VSG for WWAN and GPS measurement. The hardware provides switch and combiner for testing signal condition selection.

**)UHTXHQF\+])**

Fig. 26. The SNA test configuration.

The benifit and applications of SNA can be listed as following:

