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April 2021
PDSCH DMRS is a special type of physical layer signal which functions as a
reference signal for decoding PDSCH in 5G NR:
Select NSCID between 0 or 1. The quantity NSCID ϵ {0,1} is given by the
-
DM-RS sequence initialization field, if DCI is associated with the PDSCH
transmission, 1 is selected and, otherwise 0 is used.
-
Select NID source between Scrambling ID and PCI. Set Scrambling ID
for configuring with the higher-layer parameter data-scrambling identity
or PCI from the physical cell ID and input the required value using the
on-screen keyboard.
-
Select between Mapping Type A and B. Set Mapping Type A to start
only at symbol 2 or 3 within a slot, meaning that SLIV (Start and Length
Indicator for the time domain allocation for PDSCH) that starts from
symbol 4 or higher cannot use this type of DMRS and Mapping Type B to
start always at the first symbols of scheduled SLIV.
-
Select between Configuration Type 1 and 2. In Configuration type 1,
the minimum resource element group in frequency domain is one RE. In
Configuration type 2, the minimum resource element group in frequency
domain istwo consecutive REs.
Select DM-RS Type A Position between pos2 and pos3 to set the
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PDSCH DM-RS position for mapping type A.
-
Select DM-RS Additional Position to set the Position for additional DM-
RS in DL.
-
Select DM-RS Duration between Single and Double. Set Single when
single-symbol DM-RS is used or Double when double (two) symbols are
used.
-
Set Antenna Port to be used as reference for initial synchronization for
DM-RS. Usable antenna port is determined by Configuration Type and
DM-RS Duration.
Set Power Boosting in dB (relative) of the DMRS associated with the
-
PDSCH physical channel relative to PDSCH power.
NOTE
You need to make sure PDSCH DM-RS setting is accurately done to get the
right analysis data. For more details on setting, you can find it in the following
location: https://portal.3gpp.org/desktopmodules/Specifications
SpecificationDetails.aspx?specificationId=3213
and check the latest 38.211 documentation.
Tap to switch PT-RS to On or Off and when On, do the following steps:
-
Select KPT-RS to set the PTRS period in subcarrier in the frequency
domain between 2 and 4.
-
Select LPT-RS to set the start PTRS symbol in time domain from the
options: 1, 2, and 4.
-
Select Resource Element Offset to set PT-RS resource element offset
from Offset00, Offset01, Offset10, and Offset11.
-
Select NRNTI to set the physical channel.
Tap Summary to check all the parameters are accurately set.
SPA06MA-O User's Guide
22145360, R005
Chapter 7 Using 5G NR Signal Analyzer
Conducting PDSCH measurement
Page 263
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