How to modify CSI-RS in wireless network simulator 5G?

Question

antoine 2024-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/2128201-how-to-modify-csi-rs-in-wireless-network-simulator-5g

回答： Arun 2024-6-13

Hi everyone,

I'm currently working on MATLAB's wireless network simulator toolbox. I have two nodes: one gNB and one UE. I'm generating video traffic and using my own TDL channel. My problem is that when I add the Doppler effect to my channel, the automatic MCS selection is not optimal. I don't understand why the channel estimation degrades with the Doppler effect. Therefore, I'm looking to adjust the CSI-RS parameters to see if this can improve the channel estimation and consequently the MCS selection.I don't find any function who can permit me to adjust parameters and I can't go depper in the code of wireless network simulator.

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Answer 1

Arun 2024-6-13

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Hi @antoine,

I understand that you wish to adjust CSI-RS parameters and information regarding MCS selection along with some implementation details.

The CQI is an indicator of channel quality. The CQI value is a scalar in the range [0, 15]. The CQI value provides information about the highest modulation scheme and the code rate (MCS) suitable for the transmission to achieve the required block error rate (BLER) for given channel conditions.

Please refer the following MATLAB documentation link that provides information related CQI selection(link), CSI_RS Configuration(link) and other related details:

https://www.mathworks.com/help/5g/ug/5g-nr-downlink-csi-reporting.html

Hope this helps!

Regards

Arun