Re: [Discuss-gnuradio] IEEE 802.11 Transceiver Module - Timing offset at receiver side

On 06/04/2017 05:35 PM, Qurat-Ul-Ann Akbar wrote:
> Then what could be the problem for a low SNR. The average power I see at
> the receiver is -100 to -120 db and the signal is too distorted within
> noise.

This can have many reasons (including gain, interference, DC offsets, LO
leakage, etc etc.) I think it will take some more effort from your side
to find out what's going wrong.

You might find lots of helpful information on
- wime-project.net/installation/
- the GNU Radio Wiki
- the mailing list archive
- Stack overflow


>
> And I watched your video on YouTube in which you were showing a demo of
> the WiFi receiver. In that video you had big antennas and I don't think
> those were Vert 2450.

If the video shows larger dipoles with cables, they were ECOM9-5500.
Again, I don't believe that the antennas are your problem. I used the
transceiver successfully with many different antennas, including the
Vert 2450 that you are using.

Best regards,
Bastian



>
> On Jun 4, 2017 11:21 AM, "Bastian Bloessl" <mail@bastibl.net
> <mailto:mail@bastibl.net>> wrote:
>
>
>
> On 06/04/2017 05:16 PM, Qurat-Ul-Ann Akbar wrote:
>
> I understand. But you didnt connect them directly to the USRP.
> You used some cable to connect the two and had a stand for your
> antenna. Can you tell me which cable was that ?
>
>
> I have no idea what you are talking about. When I used the Vert
> antennas, I connected them directly to the USRP.
>
> If you experience low SNR you'll probably not improve things if you
> add cables between the SDR and the antenna. I doubt that the antenna
> or cables are your problem.
>
> Best,
> Bastian
>
>
>
>
> On Jun 4, 2017 11:13 AM, "Bastian Bloessl" <mail@bastibl.net
> <mailto:mail@bastibl.net> <mailto:mail@bastibl.net
> <mailto:mail@bastibl.net>>> wrote:
>
> Hi,
>
>
> On 06/04/2017 04:25 PM, Qurat-Ul-Ann Akbar wrote:
>
> Thank you for the explanation. Can you tell me which
> antennas
> did you use for your experiments when you wrote your paper?
> Because I think a major problem with my receiver is a
> very low
> SNR because everything works fine with simulations.
> Currently I
> am using Vert 2450 antenna with my USRP N210.
>
>
> I used the same setup with the Vert 2450 antennas.
>
> Best,
> Bastian
>
>
>
>
>
>
> On Sun, Jun 4, 2017 at 12:33 PM, Bastian Bloessl
> <mail@bastibl.net <mailto:mail@bastibl.net>
> <mailto:mail@bastibl.net <mailto:mail@bastibl.net>>
> <mailto:mail@bastibl.net <mailto:mail@bastibl.net>
> <mailto:mail@bastibl.net <mailto:mail@bastibl.net>>>> wrote:
>
> Hi,
>
> On 6/3/2017 9:11 PM, Qurat-Ul-Ann Akbar wrote:
>
> Hello,
>
> How is the timing offset being handled in the
> 802.11
> module. I
> see that the sync_long block does frequency offset
> correction
> and the frame_equalizer block does the phase
> correction
> but I
> dont understand where is the timing offset being
> handled. Can
> anyone tell me which algorithm is being used
> to do that?
>
>
> The Sync Long block correlates the signal with the
> known
> pattern of
> the long preamble to derive how the FFTs have to
> be aligned
> in time.
>
> Best,
> Bastian
>
>
> --
> Dipl.-Inform. Bastian Bloessl
> CONNECT Center
> Trinity College Dublin
>
> GitHub/Twitter: @bastibl
> https://www.bastibl.net/
>

--
Dipl.-Inform. Bastian Bloessl
CONNECT Center
Trinity College Dublin

GitHub/Twitter: @bastibl
https://www.bastibl.net/

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