3 Short-Range Comms & IoT Mode
3.3 LoRa (CSS) Demodulation Measurement
Demod Waveform Points
Sets the number of points of the demod waveform trace.
Remote Command
[:SENSe]:LORA:DWSWeep:POINts <integer>
[:SENSe]:LORA:DWSWeep:POINts?
Example
:LORA:DWSW:POIN 1001
:LORA:DWSW:POIN?
Preset 1001
State Saved Saved in instrument state
Min/Max 101 / 100001
Meas Time
Selects the minimum time elapse of the data acquisition used in the demodulation.
The measurement might require more data than that specified by the demodulation
time. If the resolution bandwidth is low on the spectrum windows, or the demod
waveform time is long, then the acquisition time might be longer than the value
specified by this parameter.
If measurement speed is critical, make sure to increase the resolution bandwidth
and reduce the demodulation waveform sweep time.
The auto rule of the measure time aims at providing a complete frame in the
acquired data for the demodulator to sync up the signal under test. However,
because of the diversity of the configuration of LoRa signals, the auto rule cannot
guarantee that there’s always a complete frame obtained by the data acquisition. In
such a case, the user can adjust this parameter based on his/her discretion.
Remote Command
[:SENSe]:LORA:DEMod:TIME <time>
[:SENSe]:LORA:DEMod:TIME?
Example
:LORA:DEM:TIME 50 ms
:LORA:DEM:TIME?
Notes If the required acquisition length is greater than the maximum capacity of the analyzer, a warning
message “Settings Alert; Acquisition truncated” is displayed
Dependencies The value of this parameter shall not be less than the sum of the demod waveform time and the demod
waveform offset
On top of that, if the measure time auto is On, the minimum measure time can be calculated in the
following way:
Calculating the length of the LoRa symbol based on the BW and the spreading factor
Multiplying the ideal symbol length with the sum of the programmed preamble length plus an
420 Short Range Comms & IoT Mode User's &Programmer's Reference
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