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

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Nicola Caldognetto
Nicola Caldognetto 2021-9-22
回答： Marc 2022-5-12
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

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回答（1 个）

Marc
Marc 2022-5-12
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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