Add 5G NR CSI-RS to DL-SCH and PDSCH modulation

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Hi,
I was re-elaborating this example https://it.mathworks.com/help/5g/ug/nr-pdsch-throughput.html#d123e1973 removing the SS burst and adding CSI data to the 5G NR grid
What've done is to configure the CSI-RS with zero power (so it would be easier to see on the trasmission grid before the channel
csirs = nrCSIRSConfig;
csirs.CSIRSType = {'zp'};
Now, the issue is that, when I use the function
ind = nrCSIRSIndices(carrier,csirs,'OutputResourceFormat','cell');
sym = nrCSIRS(carrier,csirs,'OutputResourceFormat','cell');
To have CSI-RS symbols and indices, the indices that the function returns are already used by the PDSCH modulation so, I can't understand how to add the CSI-RS and make everything work together

Answers (1)

Marc
Marc on 12 May 2022
You need to use the ReservedREs field for the PDSCH configuration to tell the PDSCH not to use those REs.
Something like:
csirsInd = nrCSIRSIndices(carrier,csirs);
% Indicate that those REs are not available for PDSCH symbols
pdsch.ReservedREs = csirsInd-1;
Then you can generate the PDSCH indices and symbols once the ReservedREs field has been populated.

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