LTE Signal Analyzer 5-3 LTE RF Measurements
3GPP MG PN: 10580-00234 Rev. T 5-3
5-3 LTE RF Measurements
The following parameters are measured in the RF Measurement mode.
Channel Spectrum
Channel Spectrum displays the spectrum of the input signal across one channel. The Channel
Power and Occupied BW are computed and displayed below the graph.
Channel Power
Channel power measures the average power within the selected bandwidth and is expressed
in dBm or Watts.
Occupied BW
The measured occupied bandwidth is calculated as the bandwidth containing 99% of the total
integrated power within the selected span around the selected center frequency.
ACLR
ACLR (Adjacent Channel Leakage Ratio) is defined as the ratio of the amount of leakage
power in an adjacent channel to the total transmitted power in the main channel and is
displayed in table format under the bar graph. The ACLR screen displays the main channel
power and the power of two adjacent channels on each side as a bar graph. For example, when
BW is set to 10 MHz, the channel spacing is –20 MHz, –10 MHz, +10 MHz and +20 MHz and
the channels are color coded.
Spectral Emission Mask
The Spectral Emission Mask (SEM) measurement supports the testing for “Operating Band
Unwanted Emissions” described in the 3GPP TS 36.141 Base Station Conformance testing
document. There is support for Category A and Category B (Option 1 only) masks which are
automatically selected based on the current carrier frequency/channel and BW values.
The instrument indicates if the signal is within the specified limits by displaying PASS
or FAIL. The emission mask information is also displayed in a table format with different
frequency ranges and whether the signal PASSED/FAILED in that region.
RF Summary
The RF Summary is a display of the occupied bandwidth, power of the main channel,
upper adjacent channels, and lower adjacent channels in a table format. The RF Summary
also shows the SEM status: PASS or FAIL. Refer to individual RF measurement descriptions
for additional details on each measurement.
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