RE: Channel Sounding - Event, Subevent, Procedure count, other parameters

parvez — Fri, 03 Oct 2025 10:05:35 GMT

Thank you amanda for your help.

RE: Channel Sounding - Event, Subevent, Procedure count, other parameters

Amanda Hsieh — Thu, 02 Oct 2025 14:46:38 GMT

Hi,

[quote user=""]1. I am unable to understand how does only one set of 72 channels is displayed when procedure count =1. Can anyone explain with timings howmany sets of 72 channels data is displayed/ taekn into consideration prior giving thge estiimated distance. [/quote]

max_procedure_count = 1 means there is only one procedure. See this post and these lines.

[quote user=""]2. Can we able to change the FFT size, Can any one guide me how to cghnage these parameters./[/quote]

Do you mean CONFIG_BT_CS_DE_NFFT_SIZE? If so, it's an internal config, so it cannot be modified by the user.

[quote user=""]3. Can anyone present the better clarity on the event/subevents/steps as per the procedure couint takes place with timings so that anyone can esaily calcute it exactly.[/quote]

Check out this post.

[quote user=""]4. Can we chaneg teh numbers channels ussed per saye from 72 to only 36 cjhannels. can anyone guide me how to perform it.[/quote]

It’s possible to set the channel map used during the CS procedure to enable only 36 channels when creating the CS configuration (see bt_le_cs_create_config() API). Another way to do this is using Set CS Channel Classification command (see bt_le_cs_set_channel_classification()).

Please be aware that this may negatively impact the algorithm. The IFFT is not too happy with missing channels. Other algorithms may not suffer that much so as always, it depends.

[quote user=""]Can anyone explain the channel map repition = 3, and channel jhump in this context.[/quote]

Check out bt_conn_le_cs_config.

[quote user=""]6. What is the maximum power which is used defaultly - 0x80. What is teh amximum distanbce, I can measure with the current default power settings. Is there any AGC to adjust the power wrt to distance.[/quote]

The range is limited by the regular BLE connection range. I can’t provide exact values, though.

Check out this post on how to adjust the tx power.

[quote user=""]7. Can we perform 2x2 antenna configuration in channel sounding. Can you please suggest the parameters to be set accordingly.[/quote]

Check out this post.

Regards,
Amanda H.