Chapter 7
Using WCDMA/HSPA+ Signal Analyzer
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JD700B Series User’s Guide
Figure 90 Channel power measurement with WCDMA/HSPA+ signal analyzer
NOTE
You can use the
LIMIT
hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See “Setting limit for RF tests” on page 185 for more
information.
Occupied bandwidth
The 3GPP specifications require the occupied bandwidth (OBW) of a transmitted WCDMA signal to be less
than 5 MHz, where occupied bandwidth is defined as the bandwidth containing 99% of the total channel
power. In this measurement, the total power of the displayed span is measured. Then the power is
measured inward from the right and left extremes until 0.5% of the power is accounted for each of the upper
and lower part of the span and the calculated difference is the occupied bandwidth.
The spectrum shape of a WCDMA signal can give a useful qualitative insight into the transmitter’s operation.
Any distortion to the spectrum shape might be an indication of degradation of the transmitter's performance.
After configuring test parameters as described in the “Configuring test parameters” on page 173, your
measurement result is displayed on the screen as like the following example, Figure 91.
