Re: [Discuss-gnuradio] Full Duplex operation, time synchronization and self interference cancellation

[Martin Braun]

Pranav,

What you're doing is definitely feasible, but your question is pretty broad. Do you think you gave a good understanding of how the ofdm stuff works internally?

Maybe you'll get more helpful responses if you ask more specific questions.

Cheers,
Martin

On 12 Sep 2016 1:45 am, "Pranav Padalkar" <address@hidden> wrote:

Good morning,

Can anyone help me with this? I don't want to use the packet structure as shown in the OFDM example. But I want to use the carrier_allocator and other blocks, and later also perform synchronization of the OFDM signal received.

Thanks and regards,

Pranav Padalkar

Fraunhofer-Institut für Eingebettete Systeme und Kommunikationstechnik ESK

 

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From: Discuss-gnuradio <discuss-gnuradio-bounces+pranav.padalkar=esk.address@hidden> on behalf of Pranav Padalkar <address@hiddenfraunhofer.de>
Sent: Thursday, September 8, 2016 1:42 PM
To: address@hidden
Subject: [Discuss-gnuradio] Full Duplex operation, time synchronization and self interference cancellation

 

Hello all,

I am trying to design a full duplex operation on my USRP3. I have to use OFDM and a defined TDMA scheme for different OFDM symbols. I also have to use a preamble, but it has to be sent once every TDMA frame. I have designed a block which takes care of my TDMA and preamble implementation. Basically, I cannot use packet structure (as given in the OFDM examples). On the transmitter side I am using OFDM carrier allocator, IFFT and OFDM cyclic prefixer(CP). 

Since, it has to be full duplex system, on the receiver side I want to perform the synchronization of my received signal with the transmitted signal, and then after removing CP and performing FFT, I have to subtract my received signal from the transmitted signal. I tried to understand the corr_est and corr_sync blocks by going through their examples. But I am not able to understand how can I get the value of offset (after synchronization), so that using that offset value I can shift my TX signal and subtract the RX signal.

I request if some one can point me in the right direction.

Thanks and Regards,

Pranav Padalkar

Fraunhofer-Institut für Eingebettete Systeme und Kommunikationstechnik ESK

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