[nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Thu, 01 Feb 2024 08:43:00 GMT

Hi, Kyle.

I'm closing this ticket, as the communication onwards regarding this case will go through the FAE.

Best regards,
Mathias

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Fri, 19 Jan 2024 12:05:44 GMT

I understand.

I've created another internal ticket, but with a different department now, to see if this may help us make some progress.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Mon, 15 Jan 2024 03:36:10 GMT

[Mathiaso] Did you try with the numbers I linked to here?

[Kyle] Yes, it is original setting i tested before. And i modified them to your mentions like as 0x38. The 5G power results of both settings are same NG in low and high channels.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Fri, 12 Jan 2024 13:01:36 GMT

So the following are the power ceiling numbers you have been using?

nrf70_tx_power_ceiling: nrf70_tx_power_ceiling_node {
		status = "okay";
		compatible = "nordic,nrf700x-tx-power-ceiling";
		max-pwr-2g-dsss = < 0x54 >;
		max-pwr-2g-mcs0 = < 0x40 >;
		max-pwr-2g-mcs7 = < 0x40 >;
		max-pwr-5g-low-mcs0 = < 0x38 >;
		max-pwr-5g-low-mcs7 = < 0x38 >;
		max-pwr-5g-mid-mcs0 = < 0x38 >;
		max-pwr-5g-mid-mcs7 = < 0x38 >;
		max-pwr-5g-high-mcs0 = < 0x38 >;
		max-pwr-5g-high-mcs7 = < 0x38 >;
	};

[quote user="mathiaso"]UPDATED: The values in the Product Change Notification are specific to the DK. You should use the numbers provided here.[/quote]

Did you try with the numbers I linked to here?

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Fri, 12 Jan 2024 03:24:38 GMT

Hi Mathiaso,

I also implemented the setting as your provide her and you can check zephyr.dts i attached but the results of outpower still the same in 5G. Those information is for your reference. Thanks,

devzone.nordicsemi.com/.../2843.zephyr.dts

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Thu, 11 Jan 2024 09:49:56 GMT

Hi Mathiaso,

I got a new version from FAE Brain. the problem still the same and the output power of gap between cmd setting is more than 1 dBm in 2.4G. Please keep debugging about this power issue. Thanks.

devzone.nordicsemi.com/.../Nordic-nRF7002-TX-power-issue_2D00_20240111.pptx

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Tue, 09 Jan 2024 15:11:51 GMT

[quote user="Kyle.W"]1.I think i don't set any limits but where can i check this setting in my device?[/quote]

You should be able to check this configuration in your devicetree or overlay file, as described in the page I linked to earlier.

[quote user="Kyle.W"]2.What does mean for those indexes of <0x54>,<0x40>,<0x38>. 54(HEX)=124(OCT)?[/quote]

0x54 * 0.25 dBm = 84 * 0.25 dBm = 21 dBm
0x40 * 0.25 dBm = 64 * 0.25 dBm = 16 dBm
0x38 * 0.25 dBm = 56 * 0.25 dBm = 14 dBm

As explained in the table describing the DTS parameters, found on the page previously linked to.

Also, be aware of this Product Change Notification elaborating a lowering of the device's lowered nominal output power. I'm currently investigating whether these values should be reflected in the numbers set for the power ceilings.

UPDATED: The values in the Product Change Notification are specific to the DK. You should use the numbers provided here.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Tue, 09 Jan 2024 00:31:55 GMT

[Mathiaso]They were also wondering if you were applying the max power ceilings?

[Kyle]

1.I think i don't set any limits but where can i check this setting in my device?

2.What does mean for those indexes of <0x54>,<0x40>,<0x38>. 54(HEX)=124(OCT)?

I saw your nRF7002 v1.1 datasheet the max power of DSSS is 20dBm.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Mon, 08 Jan 2024 12:48:54 GMT

Hi, Kyle!

Today I've received an update.

What it said was that the 6dB difference is observed in the 5 GHz band between channel 36 and 175 in our measurements too. This is attributed to the DK board design. It is being worked on a new version of the DK to mitigate this difference.

They were also wondering if you were applying the max power ceilings?

The details of the max power ceilings are described here. And the ceilings applied in our testing can be found here. These ceilings help to reduce the transmit power difference across channels within the 5 GHz band.

Best regards,
Mathias

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Tue, 12 Dec 2023 07:13:43 GMT

Hello, Kyle!

Unfortunately not. As mentioned, I will update you immediately when there is any progress. However, I have forwarded your concerns.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Tue, 12 Dec 2023 01:55:45 GMT

Dear, Do we have any progress about this issue?

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Thu, 07 Dec 2023 10:09:58 GMT

Hi again, Kyle!

Thanks for the confirmation of the values. Currently, there aren't any updates on the internal ticket. Will let you know immediately when there is progress on the issue.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Thu, 07 Dec 2023 08:54:54 GMT

Hi Mathias, i verified tx power again with nRF Connect SDK v2.5.0 today. It seems the problem is the same and output powers were lower than V2.3 for your reference. Could you please push debug process or let me know what status so far. Thanks.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Wed, 06 Dec 2023 15:22:23 GMT

No worries, Kyle.

The commands you have used seem to be correct.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Wed, 06 Dec 2023 07:37:48 GMT

Thanks reply. Could you please help check the CMDs i used are correct in 5G?

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Wed, 06 Dec 2023 06:57:16 GMT

I've got it confirmed from my colleagues that this is outside of what can be expected. Will create an internal ticket on this and update you accordingly.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Tue, 05 Dec 2023 07:42:47 GMT

Thank you, Kyle!

My immediate thoughts are that it has something to do with this. However, I will try to replicate the scenario to see if I experience the same issues as you do.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

Kyle.W — Tue, 05 Dec 2023 00:34:52 GMT

devzone.nordicsemi.com/.../WiFi-CMD-lis-and-measure-result-with-nRF7002-DK-board.7z

Hi Mathias,

Here you go. There has the CMD i used for testing and result. You can request access authority in google, too. Thanks.

RE: [nRF7002] Wifi output powers are different in 5G band when the channel is above 100.

mathiaso — Mon, 04 Dec 2023 15:12:39 GMT

Hi, Kyle!

Seems like I'm not authorized to access your first attachments and for the two others I need to log in to get access to them.

Could you please try to attach them as zip files instead?

Best regards,
Mathias