NB-IoT Multi-Evaluation Measurement
R&S
®
CMW-KM300/-KS300
243
User Manual 1178.5689.02 ─ 06
The energy, that spills outside the designated radio channel, increases the interference
with adjacent channels and decreases the system capacity. The amount of unwanted
off-carrier energy is assessed by the out-of-band emissions (excluding spurious emis-
sions). They are specified in terms of the spectrum emission mask and the adjacent
channel leakage power ratio (ACLR).
3GPP specifies a general spectrum emission mask.
Characteristics
Refer to 3GPP TS 36.521 V14.2.0, section...
Emission mask
6.6.2.1F Spectrum Emission Mask for category NB1
Emission mask settings
The spectrum emission mask can be defined in the configuration dialog. The following
figure shows the settings. For each emission mask area, you can define the frequency
borders and set an upper power limit for each frequency border. The resulting points
are connected via straight limit lines.
Figure 3-25: Emission mask settings
The start and stop frequencies of each emission mask area are defined relative to the
edge of the 200-kHz channel.
Example: Assume 0.3 MHz as start frequency and 0.5 MHz as stop frequency. The
resulting area ranges from +0.4 MHz to +0.6 MHz relative to the carrier frequency. As
all ranges are symmetrical, it ranges also from -0.4 MHz to -0.6 MHz relative to the car-
rier frequency.
Remote command:
CONFigure:NIOT:MEAS<i>:MEValuation:LIMit:SEMask:LIMit<no>
3.3.6.7
ACLR Limits
Access: "Config" hotkey > "Limits" > "Spectrum" > "ACLR" section.
The adjacent channel leakage power ratio (ACLR) limits complement the spectrum
emission mask. The ACLR is defined as the mean power in the NB-IoT channel divi-
ded by the mean power in an adjacent GSM or UTRA channel.
GUI Reference
深圳德标仪器
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