Configuring 2x2 Antenna Setup with 2 CSI-RS Ports in MATLAB's 5G Toolbox for CQI Reporting Test Compliance

I am working on implementing the table from TS138.101 Table 6.2.2.1.1.1-1: CQI reporting definition test using MATLAB's 5G toolbox example, "NR PDSCH Throughput Using Channel State Information Feedback". The table specifies that the number of CSI-RS ports (X) should be 2, with an antenna configuration of 2x2.

In the MATLAB example, setting the panel dimensions to 2x2 results in NTxAnt becoming 8, which corresponds to the number of CSI-RS ports. However, according to the test table, to set the number of CSI-RS ports (X) to 2, the row number should be set to 3. When attempting to do this, MATLAB returns an error stating that the row number must be 6 or above. How can I correctly configure the antenna to 2x2 while ensuring the number of CSI-RS ports is set to 2, as required by the test table?

[Ashok]

Hey Jake,

Could you please share the related MATLAB files?

or

Could you share the properties of the "simParameters" struct which you had changed from the example?

[Jake]

Hi Ashok,

These are the struct variables. I ened up setting the Panel Dimensions for both transmitter and receiver to [1,1] and changing the NumPanel for both to 2, to get a 2x2.(So I can set the row number to 3)

Answer 1

[Ashok]

Hi Jake,

I understand that you are facing errors when trying CSI-RS and antenna panel configuration that are not mentioned in the example "NR PDSCH Throughput Using Channel State Information Feedback".

Link to the example:

https://www.mathworks.com/help/5g/ug/nr-pdsch-throughput-using-csi-feedback.html

The supported CSI-RS configurations for the above example are taken from the document TS 38.214 Table 5.2.2.2.1-2, also given in the table below.

By this table, an antenna panel of the dimension 2x2 requires 8 CSI-RS ports. Thus, the supported CSI-RS row numbers are 6, 7 and 8.

According to the referred example, you cannot configure a 2x2 antenna with just 2 CSI-RS ports. When changing the antenna panel and CSI-RS configurations, change the sub-carrier locations as well. You can refer TS 38.211 Section 7.4.1.5.3 as mentioned in the below link, for more info on setting sub-carrier locations.

https://www.mathworks.com/help/5g/ref/nrcsirsconfig.html#mw_object_nrCSIRSConfig_sep_mw_77e933eb-a5d1-47f4-95a0-e8f1c9bb5370

I hope this is useful!