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List: gnuradio-discuss
Subject: Re: [Discuss-gnuradio] IEEE 802.11 receiver not working for high sampling rates
From: Qurat-Ul-Ann Akbar <quratulannakbar2015 () u ! northwestern ! edu>
Date: 2017-05-29 20:25:44
Message-ID: CAJwfNj1mUfmXeKn3sz8V9C4N0ENah_tqWHyzzqOzFAVxbcpTeA () mail ! gmail ! com
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Hi,
As Marcus suggested, I put a frequency sink directly to the receiver to
look at the signal. Both at 1 MHz and 10 MHz the signal is noisy. The power
is around -120 to -100 db. However, in the case of 1 MHZ all packets sent
by the USRP transmitter are received correctly with almost negligible
packet error rate. However at 10 MHZ nothing is received. There are no over
or under runs. Why would it stop working at anything above 1 MHz ?
What could be the reason for this ?
On May 26, 2017 11:03 AM, <discuss-gnuradio-request@gnu.org> wrote:
> How can I change that in that USRP N210? And how do you think it's
> affecting the transmission.
>
> Thank you .
>
> On May 25, 2017 1:27 PM, "sakthivel velumani" <sakthi92@gmail.com> wrote:
>
>> What is the update rate of DAC in transmitter side? Try increasing it.
>>
>> On Thu, May 25, 2017 at 5:43 PM, Qurat-Ul-Ann Akbar <
>> quratulannakbar2015@u.northwestern.edu> wrote:
>>
>>> Hi,
>>>
>>> I am working with USRPs N210 and GNU Radio version 3.7. I wasn't able to
>>> work with higher sampling rate like 20 MHZ used in WiFi and that's why I
>>> bought a new workstation with better processor. However, the module still
>>> isn't working. The receiver isn't receiving anything at 20 MHZ if it's QAM
>>> 64 or BPSK . It works perfectly fine with 1 MHZ and receives all data from
>>> the transmitter USRP. But at 20 MHZ it receives a few WiFi packets from
>>> surrounding far off APs in the building but isn't receiving anything from
>>> the USRP transmitter in the room. It doesn't work for 10 MHZ as well.
>>>
>>> Can anyone tell me what could be the reason for that? I have tried
>>> changing LO offset etc.
>>>
>>>
>>>
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> Discuss-gnuradio@gnu.org
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>
>>>
>>
[Attachment #5 (text/html)]
<div dir="auto">Hi,<div dir="auto"><br></div><div dir="auto">As Marcus suggested, I \
put a frequency sink directly to the receiver to look at the signal. Both at 1 MHz \
and 10 MHz the signal is noisy. The power is around -120 to -100 db. However, in the \
case of 1 MHZ all packets sent by the USRP transmitter are received correctly with \
almost negligible packet error rate. However at 10 MHZ nothing is received. There are \
no over or under runs. Why would it stop working at anything above 1 MHz ? \
</div><div dir="auto"><br></div><div dir="auto">What could be the reason for this \
?</div></div><div class="gmail_extra"><br><div class="gmail_quote">On May 26, 2017 \
11:03 AM, <<a href="mailto:discuss-gnuradio-request@gnu.org">discuss-gnuradio-request@gnu.org</a>> \
wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 \
.8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">How can I change \
that in that USRP N210? And how do you think it's affecting the transmission.<div \
dir="auto"><br></div><div dir="auto">Thank you .</div></div><div \
class="gmail_extra"><br><div class="gmail_quote">On May 25, 2017 1:27 PM, \
"sakthivel velumani" <<a href="mailto:sakthi92@gmail.com" \
target="_blank">sakthi92@gmail.com</a>> wrote:<br type="attribution"><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">What is the update rate of DAC in transmitter \
side? Try increasing it.</div><div class="gmail_extra"><br><div \
class="gmail_quote">On Thu, May 25, 2017 at 5:43 PM, Qurat-Ul-Ann Akbar <span \
dir="ltr"><<a href="mailto:quratulannakbar2015@u.northwestern.edu" \
target="_blank">quratulannakbar2015@u.northwe<wbr>stern.edu</a>></span> \
wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px \
#ccc solid;padding-left:1ex"><div dir="auto">Hi,<div dir="auto"><br></div><div \
dir="auto">I am working with USRPs N210 and GNU Radio version 3.7. I wasn't able \
to work with higher sampling rate like 20 MHZ used in WiFi and that's why I \
bought a new workstation with better processor. However, the module still isn't \
working. The receiver isn't receiving anything at 20 MHZ if it's QAM 64 or \
BPSK . It works perfectly fine with 1 MHZ and receives all data from the transmitter \
USRP. But at 20 MHZ it receives a few WiFi packets from surrounding far off APs in \
the building but isn't receiving anything from the USRP transmitter in the room. \
It doesn't work for 10 MHZ as well. </div><div dir="auto"><br></div><div \
dir="auto">Can anyone tell me what could be the reason for that? I have tried \
changing LO offset etc. </div><div dir="auto"><br></div><div \
dir="auto"><br></div></div> \
<br>______________________________<wbr>_________________<br> Discuss-gnuradio mailing \
list<br> <a href="mailto:Discuss-gnuradio@gnu.org" \
target="_blank">Discuss-gnuradio@gnu.org</a><br> <a \
href="https://lists.gnu.org/mailman/listinfo/discuss-gnuradio" rel="noreferrer" \
target="_blank">https://lists.gnu.org/mailman/<wbr>listinfo/discuss-gnuradio</a><br> \
<br></blockquote></div><br></div> </blockquote></div></div>
</blockquote></div></div>
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