LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
525
User Manual 1173.9628.02 ─ 16
sured. So the measurement covers a symmetric frequency range around the center
frequency of the aggregated bandwidth.
Resolution filters with bandwidths of 30 kHz, 100 kHz and 1 MHz are available. Traces
for all three resolution bandwidths (RBW) can be displayed in parallel, with the 30 kHz
continuous trace at the bottom, the 1 MHz trace on top and the 100 kHz trace in-
between.
The 100 kHz and 1 MHz traces are only displayed for frequency ranges with active lim-
its. Depending on the limits, the traces are hidden completely, displayed partially or
displayed for the entire out-of-band range.
In the figure above, the outer limit lines and traces are for RBW = 1 MHz. The short
inner limit lines and the continuous trace correspond to RBW = 30 kHz and the 100
kHz trace is hidden because no limits use it. See also
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 36.521, the measurement must be carried out at maximum out-
put power of the UE.
Margin results
To show/hide the margin results, use the softkey - hotkey combination "Display" - "Mar-
gin On | Off".
Fig. 3-28: LTE 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 fre-
quency.
General Description
深圳德标仪器
135-1095-0799