# CQI_mapping.table

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• #8686
Kim Ha Seong
Participant

Hi,
I tried to include new CQI table (including 256-QAM).
I tried to get that values which was already written, but I didn’t know where them from.
Therefore, I add the new CQI table in this simulator, and drew a BLER-SNR curve.
Is is okay, do I get the ‘BLER 0.1 point’ from there?

if not, where can i abstract this values?

my setting parameters are
SUSISO, AWGN or VehA, 1.4MHz(BW), … etc.

best regards
ha seong

#8688
Stefan Schwarz
Participant

Hi,
the values in LTE_params.CQI_mapping.table correspond to BLER 0.1 for the modulation and coding schemes of CQIs 1 to 15 specified in LTE_load_parameters.dependent.m line 440 and below. (The first value -500 in LTE_params.CQI_mapping.table is just a dummy value used when the SNR is too bad even for CQI 1).

You can obtain these values by using SUSISO, AWGN, LTE_params.UE_config.feedback = false and simulating with fixed cqi_i \in {1,…,15} over SNR.

Best,
STefan.

#8690
Kim Ha Seong
Participant

Thanks, Stefan Schwarz.

1) what were the parameters setting?
– Did you use PDCCH ? (true / false) and what about other settings? (i.e. receiver..)
2) You told me that I can obtain these values by using SUSISO, AWGN, LTE_params.UE_config.feedback = false and simulating with fixed cqi_i \in {1,…,15} over SNR.
But, I want to modify the values (-500, … ) for 256-QAM, so I need to get the new BLER 0.1 point.

In here, to get that 0.1 BELR point,
First, Settings.
Second, Draw the curve and then check the point.
Is it right method?
because when I get the SNR-BLER curve using LTE_sim_batch_BLER_curve.m I have to set the SNR range(i set 0.25 gap).
Do i have to set the gap more specific?

Best,
ha seong

#8691
Kim Ha Seong
Participant

one more thinng is that there is a av_const to get obj.BLER_monitor in UE.m .
why did you set the av_const = 10 ; here?

and I want to know how to see the BLER values duting simulation.
it means which line should i display?

I’m waiting for you answer, Stefan Schwarz.

best
Ha seong

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