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

[Bastian Bloessl]

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" <address@hidden 
> <mailto:address@hidden>> 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
>         <address@hidden <mailto:address@hidden>
>         <mailto:address@hidden <mailto:address@hidden>>> 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/