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Re: [ath9k-devel] strange MPDU loss pattern

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But for this channel conditions should be changing at the scale of 100
micro secs consistently.

On Sat, Oct 25, 2014 at 12:13 AM, Adrian Chadd <adrian@xxxxxxxxxxx> wrote:
> It's not completely unsurprising - the initial channel estimate and
> such is done at the beginning of each packet and stays constant. So if
> there's some varying channel conditions that change that during the
> duration of a packet, the tail end is going to end up having less SNR
> and may end up getting more errors.
>
>
> -adrian
>
> On 24 October 2014 09:04, Ali Abedi <a2abedi@xxxxxxxxxxxx> wrote:
>> Hello,
>>
>> We study the effects of 802.11n frame aggregation on throughput. We noticed
>> a
>> strange pattern in the MPDU loss within an aggregated frame. It seems that
>> the
>> second half of the MPDUs (those with higher sequence numbers) in an
>> aggregated frame
>> are more likely to be lost. Is this a known fact or is there any explanation
>> for it?
>>
>> For example if 32 frames are aggregated with sequence numbers 100 to 131.
>> Frames with sequence numbers 100-115 are more likely to be received
>> correctly
>> than 116-131.
>>
>>
>> Best,
>> Ali
>> --
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