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[Solved] Question about parameter CDL_5G.num_slots

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kaiyi

(@kaiyi)

New Member

Joined: 2 years ago

Posts: 1

11/04/2022 9:36 am

Why the channel matrixes of different users with same CDL_5G.num_slots have different dimensions? I want to generate channel matrixes with 40 time slots in scenario O2_dyn_3p5, As mentioned in website, the first dimension of the matrix should be 40*14=560. However, the first dimensions of user2 and user3 are both 546, which means one time slot has missed. Could you please tell me the reason?

Regards

>> size(DeepMIMO_dataset{1}{1}.user{1}.channel)

ans =

560 1 64 12

>> size(DeepMIMO_dataset{1}{1}.user{2}.channel)

ans =

546 1 64 12

>> size(DeepMIMO_dataset{1}{1}.user{3}.channel)

ans =

546 1 64 12

This topic was modified 2 years ago by kaiyi

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udemirhan

(@udemirhan)

Member Admin

Joined: 2 years ago

Posts: 39

05/05/2022 3:37 pm

Hi @kaiyi,

This is a bug caused by the Matlab built-in function “nrChannelEstimate” which is part of the 5G Matlab Toolbox that we use some of its functions in DeepMIMO 5G NR. I reported it to the Mathworks/Matlab team and and they have confirmed that there is a bug with the nrChannelEstimate function.

Essentially, the generated frame may be missing the last OFDM sample. For now, to overcome this bug, you can set a larger num_slots value to obtain extra samples and take the needed slots. In your case, you can make num_slots 41 and take the first 40 for your application.

Thanks,

Umut

This post was modified 2 years ago 2 times by udemirhan

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