5GNR Analyzer Measurement Guide : 5GNR Analyzer (Option 888) : 5GNR Occupied Bandwidth
 
5GNR Occupied Bandwidth
To select channel power measurement go to main menu and press MEASURE > MEASUREMENT >OBW. The OBW measurements are set up using the SETUP Menu (5GNR OBW). Occupied Bandwidth (OBW) is a common measurement performed on radio transmitters. This measurement calculates the bandwidth containing the total integrated power occupied in a given signal bandwidth. There are two different methods of calculation depending upon the technique used to modulate the carrier.
• % Integrated Power Method: The occupied frequency bandwidth is calculated as the bandwidth containing the specified percentage of the transmitted power.
• X dB Method: The occupied frequency bandwidth is defined as the bandwidth between the upper and lower frequency points at which the signal level is a desired number of dB below the peak carrier level.
An Occupied Bandwidth measurement using the % integrated power is shown in Figure: 5GNR Occupied Bandwidth Measurement. The occupied bandwidth here is the bandwidth containing 99% of the total channel power. This is calculated from 0.5 % of the total mean power below the lower frequency limit and 0.5% above its upper frequency limit of the signal. Alternatively, the measurement can be set up to use the X dB method where the occupied bandwidth is determined from the upper and lower bandwidth edges that are X dB down from the total mean power of the signal.
5GNR Occupied Bandwidth Measurement

1. 5GNR Analyzer Status Panel: Each measurement features a unique status panel that displays settings and information relevant to the current measurement and view settings. This panel provides quick access to the measurement frequency, subcarrier spacing, channel bandwidth, and band configuration. See Status Panel (5GNR OBW).
2. Occupied Bandwidth: Occupied bandwidth is integrated over the shaded region where the dashed green lines indicate the upper and lower frequency thresholds. The analyzer will determine and track the occupied bandwidth of the signal within the current span.
3. SYNC: Valid 5GNR occupied bandwidth measurements require signal synchronization. The indicator here blinks green when the received signal is synchronized, indicating that you have a valid measurement.
4. SETUP Menu: The occupied bandwidth settings are configured in the SETUP menu. See SETUP Menu (5GNR OBW).
5. OBW Summary: This area shows the occupied bandwidth measurement summary data and pass/fail test results:
• The summary also includes left/right edge and center frequency values expressed in frequency units.
• The occupied bandwidth value and the test limit are expressed in frequency units with a pass/fail result.
• The total power is integrated over the measured bandwidth and is expressed in dBm.
• Tapping this summary area opens the OBW SETUP menu.
SETUP Menu (5GNR OBW)
The Occupied Bandwidth SETUP menu is available in MEASURE > MEASUREMENT > OBW > SETUP. Once the OBW measurement is selected, the SETUP menu can be quickly accessed by tapping on the summary display area below the spectrum display.
5GNR SETUP Menu (OBW)
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% OBW POWER
Sets the percentage of the total power that is measured within the occupied bandwidth for the current measurement. The resulting occupied bandwidth and total power values are displayed in the measurements results table.
X dB
Sets the x dB value used for the "x dB bandwidth" measurement. The occupied bandwidth is the frequency range between two points on the signal that are x dB down from the highest signal point within the OBW span.
OBW LIMIT
Enables limit checking at the specified frequency. The limit test results show as a green PASS or a red FAIL in the measurement table.
METHOD
Select the measurement method to be PERCENT (%) or X (dB).
PRESET SETUP
Presets the SETUP menu to default settings.
Status Panel (5GNR OBW)
The status panel illustrated in this section is unique to the current analyzer and to the particular measurement and view that is selected. Figure: Status Panel (5GNR OBW Measurement) shows the 5GNR status panel that covers the 5GNR OBW measurements.
 
Status Panel (5GNR OBW Measurement) 
SWEEP: Toggles the current sweep setting between continuously or sweep once.
SWEEP ONCE
When sweep is set to single sweep, SWEEP ONCE updates the measurement display. Data continues to be captured in the background.
BAND
Select MANUAL, GLOBAL ALL or one of the predefined bands. Selecting MANUAL hides ARFCN and GSCN settings. Selecting a predefined band or GLOBAL ALL activates ARFCN and GSCN settings.
REF LEVEL
The reference level is the top graticule line to the left on the measurement display. If the reference level offset is not zero, the offset reference level is displayed at this location. Selecting the plus (+) or minus (–) control increments the value by 10. The plus/minus (+/-) button on the keypad toggles between positive and negative values.
SECOND REF LEVEL
The reference level is the top graticule line to the right on the measurement display. Its functionality is exactly same as reference level, but it is only available when trace math is enabled
CHANNEL BW
Sets the measurement channel bandwidth. The available bandwidth settings depend on the selected band and bandwidth option installed in the instrument. Refer to “Options Settings” section in Instrument Overview chapter of the user guide.
SCALE/DIV
The scale can be set from 1 dB per division to 15 dB per division. The default setting is 10 dB. Selecting the plus (+) or minus (–) control changes the value by 1. SCALE/DIV is not available when linear y-axis amplitude units are selected.
SECOND SCALE/DIV
It applies to second reference level and is available only when trace math is enabled.
SUBCARRIER SPACING
Sets the subcarrier spacing. The available input range is dependent on the selected band.
CENTER FREQUENCY
When the band is set to MANUAL, sets the center frequency of the measurement channel. Changing the center frequency sets the band to MANUAL.
SSB OFFSET
SSB is the Synchronous Signal Block. The SSB Offset sets the frequency offset between the SSB and the overall resource block.
AUTO ATTEN
Input attenuation can be either tied to the reference level (on) or manually selected (off). When input attenuation is tied to the reference level, attenuation is increased as higher reference levels are selected to make sure the instrument input circuits are not saturated by large signals that are likely to be present when high reference levels are required.
ATTEN LEVEL
When auto attenuation is off, the attenuation value can be set manually to a resolution of 5 dB. Selecting the plus (+) or minus (–) control increments the value by 10.
TRACES: Displays the current status of up to six traces in a quick-view summary. The summary information includes the trace number, type, mode, and detector type. The active trace or cursor will show a highlighted background with the mode and detector type restated under the table. Touching a trace in the summary panel opens the TRACE menu. It allows you to select and set up an individual trace as desired.
FREQ REFERENCE
Indicates the current frequency reference source of Internal, External, or GNSS (GPS) Hi Accuracy (requires GPS). The instrument automatically selects the frequency reference in the following order of priority: external, GPS, then the internal time base.