‫No, this is the floor diagram that can be used for the real time data communication over the wireless
‫channel using the pesky modulation.
‫And first, we are trying with the BP escape modulation.
‫And here this is the same floor diagram as we discussed previously.
‫However, there are some small changes in it.
‫First, we have removed the channel model block.
‫Instead, we have added the U.S. Harbi Sync Block here and this U.S. IRP Sync Block is connected to
‫the output of the Constellation modulator block through the multiply constant block.
‫Now, you might ask the question that why we are multiplying the output of the constellation modulator
‫by a constant, which is zero point five in this case.
‫And then we are giving it to the U.S. ha async.
‫In fact, we are doing this because we do not want their.
‫The signal that is being given to the U.S. harpy sync it is at its maximum amplitude because in that
‫case, U.S. harpy sink may saturate.
‫And in that case, Razavi means saturated.
‫And as a result, there might be damage to the U.S. harbor.
‫So in order to avoid the damage to the U.S. harpy, we multiply the constellation modulator out or by
‫zero point five and are in other words, we scale it down by half and then give it to the U.S. harpy
‫sink blocks.
‫Will that it is not damage.
‫So the signal that is given to the U.S. Harkabi sink, it is then sent over divide loss channel using
‫the antenna.
‫And then this signal is received here by these all smoke source block at the receiver.
‫And in fact, we are receiving more signal using the article SDR and the article SDR receives these
‫transmitted RF signal.
‫And this article SDR is basically it can be controlled using the all smoke oame source block at the
‫receiver and then the signal that we have received, we give it to the input of the ball if he is Glock's
‫in colonization block and rest of the flow diagram.
‫It is the same as we had previously discussed.
‫However, here the output constellation that we are seeing, we are seeing the constellation at two
‫points.
‫First, we are seeing the constellation diagram of the RF signal that has been received by the RTL,
‫SDR and which is then demodulator to the baseband.
‫And we are seeing that signal here at the output of the small combe force using this constellation sing.
‫And the second constellation seeing is at the output of the equalizer.
‫So the signal that is received by DBI or small Coomes source.
‫It is then given to the polytheist Glock's synchronization block of your clock is recovered.
‫Then you have the call sparse block vier you recover the Gadhia.
‫And after that you have the equalizer which equalizes.
‫I remove the outer removes the effect of the inter simbel interference from frequency distortions.
‫And so after that we are seeing the constellation diagram here at the output of the equalizer.
‫So these two blocks are very important in my opinion, because whenever you have any problems at the
‫receivers, the first thing that you should glueck that if we are not receiving the data, we should
‫look at the Constellation diagrams and you can look at the Constellation diagram using the Constellation
‫sinc block one or the received signal and the second one after you have done the processing at the signal.
‫And as far as the output of the data that we have, finally we will decode these constellation block
‫bagna.
‫And then we will recover these data.
‫And then this recovered that up.
‫We are opening it in two ways.
‫First, we are writing it into a file which is out.
‫Got the 60 file.
‫And second, we are showing it on the next terminal.
‫Now, here I have a Linux terminal.
‫And if I.
‫Clear it.
‫And then if I write duty, why so this is the for a part of the file.
‫That is the output of the bat.
‫That is linked to the output of this Linux terminal.
‫So I copy this spot.
‫Backslash dev, backslash Boethius, backslash one, and then I write this part in the file sync and
‫then I click, Okay now.
‫Now after that vent, everything in the floor diagram is set.
‫I run this floor.
‫Naegle.
‫And here on top, you have the signal that is being received by the RTL, SDR.
‫And at the bottom you have the signal that is B that has been equalized, that is at the output of equalizer.
‫And you can see that initially the receiver was not in converged state, but after sometimes the receiver
‫locks on to the signal and we get the this constellation diagram out of this signal.
‫And you can see that the signal that is being received by the RTL, SDR, it is repeating.
‫That means there is frequency difference between the transmitter and the receiver.
‫And this problem is then solved using the.
‫Co-stars look, the receiver and other problems often dissemble interference.
‫You are also seeing in dissemble interference here.
‫So Equalizer is removing that kind of symbol interference and we are getting these two Gleen Constellation
‫points.
‫And here at the terminal, you can see that the data that is being sent by the transmitter, we are
‫clearly receiving this that up here.