General Description
R&S
®
CMW-KN5xx
28
User Manual 1176.7690.02 ─ 05
The shape of the resolution filter is configurable for 100 kHz and 1 MHz bandwidth
(gaussian or bandpass). For 30 kHz traces a gaussian filter is used.
According to 3GPP TS 36.141 the measurement must be carried out at maximum out-
put power of the eNodeB.
The OBW result below the figure indicates the occupied bandwidth, the width of a fre-
quency range around the assigned channel frequency containing 99% of the total inte-
grated power of the transmitted spectrum.
See also
chapter 3.7.3, "Spectrum Emission Mask"
Margin results
To show/hide the margin results use the softkey - hotkey combination "Display" - "Mar-
gin On | Off".
Fig. 3-17: LTE eNodeB Multi Evaluation: Emission Mask - margin results
A margin indicates the vertical distance between the spectrum emission mask limit line
and a trace. For each emission mask area the margin represents the "worst" value, i.e.
the minimum determined for the frequencies of the area:
Margin = minimum (P(f)
mask
- P(f)
trace
)
A negative margin indicates that the trace is located above the limit line, i.e. the limit is
exceeded.
The margin result display presents for each active area a "X [MHz]" and a "Y [dB]"
value, for negative (neg) and positive (pos) offset frequencies. The Y value indicates
the margin (worst value within area), the X value the frequency offset at which the mar-
gin value was found. These frequency offsets are indicated relative to the center carrier
frequency.
The screenshot above shows margin results for the current trace. Corresponding mar-
gin results are displayed for all active traces (Current, Average, Maximum). In this con-
text "Average" means "margins for average trace" and not "average values of margins
for current trace", "Minimum" means "margins for maximum trace" (resulting in mini-
mum margins).
For additional screen elements refer to
chapter 3.8.11, "Common View Elements"
Measurement Results
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