About MIMO Info Table (NB-IoT)
shows information about the antenna port transmissions detected by the demodulator.
The first column contains the name of the data result, and the other columns display the value of the data result for each antenna port signal received on a VSA measurement channel (Rx0 = Measurement Channel 1).
The NRS results in this summary table are calculated regardless of successful demodulation, which means user mappings do not need to be defined for these data results to be calculated.
Symbol Timing Adjust setting of . When is set to a value other than , these data results may not match the corresponding reference signal EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. and Common Tracking Error data results in the Error Summary and Frame Summary tables.
and are calculated with aBelow is a table of data results provided and their descriptions. Click on the name of a data result for more information.
Data result |
Description |
---|---|
RSCTE (%rms) | Average (RMS) NRS Common Tracking Error |
RSEVM (%rms or dB) |
Average (RMS) NRS EVM Units are determined by the Report EVM in dB parameter. |
RSFreq (Hz) | NRS frequency shift error |
RSPhase (degrees) | Average (RMS) NRS phase error |
RSPwr (dB) | Average (RMS) NRS signal power |
RSSymClk (ppm) | Average NRS symbol clock error |
RSTiming (seconds) | NRS timing error |
Averaging
This trace supports averaging over multiple measurements. When Averaging is enabled, value "mm" in the "RMS: mm" or "Peak: mm" annotation at the top of the trace displays how many measurement sweeps have been included in the current average.
Querying summary table data results programmatically
To programmatically query the Trace Summary Table data results using the Summary() and SummaryUnit() methods in the MeasurementData object.
See the How To Query Summary Table Data Results topic for more information.
app.Display.Traces.SelectedItem.DataName = "MIMO Info Table1"
The indexes of the
data values change depending on the number of transmit and receive antenna ports. Instead of using hardcoded indexes to retrieve the data values, you can use a data result name to query the data value.The data result names for the RS data results in this summary table are formed by concatenating a measurement name with a transmit-receive path. To create the name of a data result for a specific transmit-receive path, append the transmit antenna port and the receive channel to the name of the data result. "Txn" indicates NRS antenna port 200n, and "Rxm" indicates VSA measurement channel m.
Each IQ data result is repeated in the list of data results returned by
for each NRS antenna port. To get the value of an IQ data result for a particular NRS antenna port, construct the appropriate data name and search for the first data result that matches the data name and does not have "---" as the value. Repeated IQ data results that have a value other than "---" will contain identical numerical values which means that finding the first one is sufficient.Example
To get the value of RSPwr for the NRS1/Rx0 receive path listed on the MIMO Info Table, you would query the data result named "RSPwr" + "Tx1" + "Rx0" = "RSPwrTx1Rx0"
Data Result Name |
MIMO Info Table Results |
---|---|
RSCTE |
Average (RMS) NRS Common Tracking Error |
RSEVM |
Average (RMS) NRS EVM Units are determined by the Report EVM in dB parameter. |
RSFreq |
NRS frequency shift error |
RSPhase |
Average (RMS) NRS phase error |
RSPwr |
Average (RMS) NRS signal power |
RSSymClk |
Average NRS symbol clock error |
RSTiming |
NRS timing error |
See Also