Download FSW-K10x LTE UL User Manual

R&S®FSW-K10x (LTE Uplink)
Measurements and Result Displays
I/Q Measurements
Spectrum Flatness Difference.......................................................................................15
Constellation Diagram...................................................................................................16
CCDF............................................................................................................................ 16
Allocation Summary...................................................................................................... 17
Bit Stream..................................................................................................................... 18
Result Summary............................................................................................................18
Marker Table................................................................................................................. 21
Capture Buffer
The Capture Buffer result display shows the complete range of captured data for the
last data capture. The x-axis represents time. The maximum value of the x-axis is
equal to the Capture Time. The y-axis represents the amplitude of the captured I/Q
data in dBm (for RF input).
A green vertical line at the beginning of the green bar in the Capture Buffer display
marks the subframe start. Additionally, the diagram contains the "Start Offset" value.
This value is the time difference between the subframe start and capture buffer start.
When you zoom into the diagram, you will see that the bar may be interrupted at certain positions. Each small bar indicates the useful parts of the OFDM symbol.
Remote command:
Selecting the result display: LAY:ADD ? '1',LEFT,CBUF
Querying results: TRACe:DATA?
Querying the subframe start offset: FETCh:​SUMMary:​TFRame?​ on page 120
EVM vs Carrier
Starts the EVM vs Carrier result display.
This result display shows the Error Vector Magnitude (EVM) of the subcarriers. With
the help of a marker, you can use it as a debugging technique to identify any subcarriers whose EVM is too high.
The results are based on an average EVM that is calculated over the resource elements for each subcarrier. This average subcarrier EVM is determined for each analyzed slot in the capture buffer.
User Manual 1173.9386.02 ─ 05
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