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
> (<michael.dick...@ettus.com>) 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
>> }}}
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