On 05/27/2017 02:41 PM, Norik Dzhandzhapanyan wrote:
> Yes ~6dB
If a packet is sent on 1 chain with ath10k firmware (9880 hardware, specifically, but probably
others as well), it will be around 6db higher on that particular chain
than if the rate-control sends it on all three chains.
Are you measuring on a single chain, or on all of the chains at once and adding
the power?
I think we would need more detailed reporting using a good third-party device before
smoothing and RSSI.
Thanks,
Ben
>
>
> From: Ben Greear
> Sent: Saturday, May 27, 2:38 PM
> Subject: Re: [PATCH] Per chain RSSI reporting
> To: Norik Dzhandzhapanyan, Adrian Chadd
> Cc: [email protected], [email protected]
>
>
> On 05/27/2017 12:25 PM, Norik Dzhandzhapanyan wrote: > We see this inconsistent/incorrect reporting in our RF chamber. How different are the values, and did you sniff with a third-party device to see if it sees the same spikes in RSSI? Thanks, Ben > > Norik > > On 05/27/2017 09:39 AM, Adrian Chadd wrote: >> On 27 May 2017 at 09:07, Ben Greear wrote: >>> At low encoding rates, especially if it switches to a single-chain encoding, >>> maybe the on-air signal really is stronger? >>> >>> Have you verified in some other manner than the signals reported by ath10k >>> are >>> wrong? >> Hiya, >> >> So yeah, multipath, higher TX rates == weaker TX signal, TPC, etc are >> all interesting to know about at the receiver. it's hard to separate >> that out from the noise sometimes, but in some controlled deployments >> its really obvious. >> >> >> >> -adrian >> >> > > > The contents of this transmission are Ethertronics Inc. Confidential and may contain proprietary or legally privileged
> information which may not be disclosed, copied or distributed without the express written consent of Ethertronics Inc. The information is intended to be for the use of the individual or entity named on this transmission. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this transmission in error, please notify us by telephone immediately so that we can arrange for the retrieval of the original documents at no cost to you. Alternatively, notify the sender by replying to this transmission and delete the message without disclosing it. Thank you > -- Ben Greear Candela Technologies Inc http://www.candelatech.com
>
--
Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
On 27/05/17 23:49, Ben Greear wrote:
> On 05/27/2017 02:41 PM, Norik Dzhandzhapanyan wrote:
>> Yes ~6dB
>
> If a packet is sent on 1 chain with ath10k firmware (9880 hardware, specifically, but probably
> others as well), it will be around 6db higher on that particular chain
> than if the rate-control sends it on all three chains.
>
> Are you measuring on a single chain, or on all of the chains at once and adding
> the power?
>
> I think we would need more detailed reporting using a good third-party device before
> smoothing and RSSI.
>
> Thanks,
> Ben
>
>>
Also noteworthy is that if you measure in a cabled environment and add the signal from multiple chains with a combiner
you will probably measure the power wrong.
The reason for this is that the cyclic shift diversity doesn't work well in a 2 dimensional environment (cable) compared
to the 3 dimensional environment (air).
BR
Matthias
>>
>> From: Ben Greear
>> Sent: Saturday, May 27, 2:38 PM
>> Subject: Re: [PATCH] Per chain RSSI reporting
>> To: Norik Dzhandzhapanyan, Adrian Chadd
>> Cc: [email protected], [email protected]
>>
>>
>> On 05/27/2017 12:25 PM, Norik Dzhandzhapanyan wrote: > We see this inconsistent/incorrect reporting in our RF chamber.
>> How different are the values, and did you sniff with a third-party device to see if it sees the same spikes in RSSI?
>> Thanks, Ben > > Norik > > On 05/27/2017 09:39 AM, Adrian Chadd wrote: >> On 27 May 2017 at 09:07, Ben Greear wrote:
>> >>> At low encoding rates, especially if it switches to a single-chain encoding, >>> maybe the on-air signal really is
>> stronger? >>> >>> Have you verified in some other manner than the signals reported by ath10k >>> are >>> wrong? >>
>> Hiya, >> >> So yeah, multipath, higher TX rates == weaker TX signal, TPC, etc are >> all interesting to know about at
>> the receiver. it's hard to separate >> that out from the noise sometimes, but in some controlled deployments >> its
>> really obvious. >> >> >> >> -adrian >> >> > > > The contents of this transmission are Ethertronics Inc. Confidential
>> and may contain proprietary or legally privileged
>> information which may not be disclosed, copied or distributed without the express written consent of Ethertronics Inc.
>> The information is intended to be for the use of the individual or entity named on this transmission. If you are not
>> the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information
>> is prohibited. If you have received this transmission in error, please notify us by telephone immediately so that we
>> can arrange for the retrieval of the original documents at no cost to you. Alternatively, notify the sender by
>> replying to this transmission and delete the message without disclosing it. Thank you > -- Ben Greear Candela
>> Technologies Inc http://www.candelatech.com
>>
>