Re: [Discuss-gnuradio] Problema REX OFDM

[Michael Dickens]

Hi Jale - OK; thanks for the updates & for translating to English :) In the future, please "reply all" to include the GNU Radio discussion list: more eyes on your issue are more likely to help you.

Suppose you create a GRC flowgraph where the OFDM Mod goes through a virtual channel (there's a GR block that does this) and then into an OFDM Demod (using the same OFDM setttings for both the Mod and Demod) ... does that work? - MLD

On Wed, Jun 19, 2019, at 11:08 PM, Jale Ocampo wrote:

I thank you for your great help. * I have already changed the file and the amplitude that I have is [-1, +1]. * In effect, the transmission is wireless. But at the moment I'm doing tests at short distances. But after the OFDM MOD block, in the part of the receiver I do not get the demodulated signal, I only have one continuous signal. * I have already changed to the default parameters for now.  

El mié., 19 jun. 2019 a las 19:04, Michael Dickens (<address@hidden>) escribió:

Hi Jale -

From translate.google.com

{{{

Best regards, apologies for not writing in English.

I'm doing a project for a tx and rx with OFDM modulation.

The transmitter does not present any kind of problem to traffic.

But in the receiver after the OFDM DEMOD block, the original signal is not regenerated.

If someone could help me, please.

It should be noted that I am working with USRP B10 cards

Subsequently, I must calculate the BER of the Recepted signal

I attach the files.

Thank you.

}}}

My reply:

{{{

translate.google.com is your friend ... feel free to use it but also please note in your emails that you're using it.

A few thoughts:

* get the Tx signal to be closer to [-1, +1] ... [-0.6, +0.6] isn't full scale, and the Tx signal will be that much weaker.

* you don't note how you are transmitting the data from Tx to Rx ... wirelessly? via a cable (hopefully with in-line attenuation)? the Rx signal could be very small if the Tx -> Rx distance is too great.

* If you change the OFDM parameters, does the system work ... for example using the default values that the OFDM Mod and Demod use? At least in some cases for GR OFDM, using anything but the defaults doesn't work without significant effort and knowledge of how to get it working.

Hope this is useful! - MLD

}}}