### Amit Sravan Bora (@amitjonak)

Hello DSP folks,I was wondering if anyone here has any idea on 2D delay-Doppler channel and how to generate the channel matrix? Even a hint or a resource would be...

I am trying to do some implementation on Xilinx ZCU111 RFSoC board. I am basically trying to send an OFDM signal and loop back to the processor and see its spectrum....

Thank you very much for the detailed reply. Actually I am a Masters student and I am writing my thesis which is to implement an all-digital frequency-hopped OFDM...

Generally, DC Nulls are added in OFDM because zero-IF receivers don't pass the DC component. But what if I use an RF direct sampling architecture? Will there be...

Hello everyone!I successfully designed the wideband frequency hopped OFDM+BPSK system where I use multiple DUCs and DDCs to achieve up and down-conversion to and...

Yes sir those two mixers we cannot ignore. Yes they are digital but I guess simulink implements with those mixers being already matched I guess.

Yes sir, but here I haven't used mixer. Basically I want to build this system in an all-digital way and that is why I am using digital up and down converters and...

Hello sir, sorry for the late reply. Regarding my system, I kind of fixed the problem but I do not know if it is a good way to fix it. So I was wondering if you...

I see. Do you think finding the group delay of the cascaded filter response for the DUC and the DDC might do any help? Actually the method that you mentioned is...

Actually sir, if I use the "complex phase difference" simulink block to calculate the difference and then use it to shift the signal, I get a zero BER. But since...

Yes sir I get that and that is why I am not getting the BER completely as zero. But do you think I can read any method which might give me better results? Right...

But sir, I tried to do the same but I still get some phase error. This maybe because of the DUC and the DDC blocks, which is different than just simple up -conversion....

Thank you so much sir for this simple yet amazing code. I see that you just upsample the ifft signal before up converting and then downsample after downconverting....

Sir, my method of compensating the error is pretty simple. The signal that I send in the transmitter is just a BPSK signal right? So that means my signal is real...

Hello sir! Thank you for replying my question. I understand that in real life we get rid of the phase error in a different way than the way I did. But actually...

Thank you sir for the reply. I have a question about what you said. You mentioned discarding the initial filters garbage. I do not understand this. Can u please...

Hello everyone,I am back with a question related to my OFDM Transceiver System that I am designing where I use DUC and DDC. I could get rid of the high BER problem....

Actually I am not using any channel, but I am using the in-built Digital Up-converter and Digital Down-converter to modulate and demodulate my OFDM signal. Basically,...

Hello everyone!I was simulating a simple OFDM transceiver system without a channel (just the transmitter and the receiver directly connected). I saw that if I use...

Yes I have seen that. But nothing available for the ZCU1275 board. My professor is also considering to shift back to ZCU111. Actually to be honest, he thought implementing...

Thank you sir for the response! Actually there is only one example design available for this board, which is just a mere loopback test. Other than this, there is...

Actually our lab has already bought the ZCU1275 RFSoC. My supervisor wants me to implement a wideband frequency hopped OFDM system within a range up to 2.3 GHz....

Our lab actually bought it and now it is too advanced for a lab with Masters students to learn it. I don't know how am I supposed to finish my thesis if I have to...

Yes sir all carrier shifts are done on time domain baseband samples. I am still trying with different specs to see if I made any error in the method

Yes sir, I used a sampling rate of 40MHz for the baseband OFDM signal and I used an interpolation factor of 20 to achieve the output sampling rate of 800 MHz with...

Hello again!I want to achieve wideband frequency hopping by digitally up converting my OFDM signal and then digitally down converting the signal at the receiver...

Hello!Just like we can use a SRRC filter for pulse shaping BPSK symbols, why is it that we cannot use a SRRC filter for pulse shaping a BPSK modulated OFDM symbol?...

Thank you very much sir for replying me. Well, firstly I am sorry that I used the term "inverse" for the receive pulse shaping filter. What I meant is whatever the...

Thank you very much for the time spent on my last post as well. I think I realize now where the problem lies. As I mentioned earlier that the DUC and DDC blocks...

Thank you so much for making me understand. Actually a week ago I asked a question regarding the transceiver system where I try to achieve wideband hopping through...

Hello everyone!When considering a transceiver system, if we do a certain filtering operation on the signal, will the BER of the system be affected? My point is,...

Can you please refer to my new question in the link given below? I have specified clearly about my problems with diagrams.https://www.dsprelated.com/thread/10597/help-in-designing-filter-for-duc-digital-up-converter-and-ddc-digital-down-converter-using-the-built-in-duc-and-ddc-blocks-in-matlab-simulinkThank...

Can you please refer to my new question in the link given below? I have specified clearly about my problems with diagrams.https://www.dsprelated.com/thread/10597/help-in-designing-filter-for-duc-digital-up-converter-and-ddc-digital-down-converter-using-the-built-in-duc-and-ddc-blocks-in-matlab-simulinkThank...

Can you please refer to my new question in the link given below? I have specified clearly about my problems with diagrams.https://www.dsprelated.com/thread/10597/help-in-designing-filter-for-duc-digital-up-converter-and-ddc-digital-down-converter-using-the-built-in-duc-and-ddc-blocks-in-matlab-simulinkThank...

Please refer to my new question which is much more detailed. The question has all the necessary specs details along with several screenshots of the block, spectrums,...

I see, the problem is with the built-in DUC and the DDC block of simulink. All it says is that they do interpolation and decimation at 3 stages with the help of...

Hello! Well, the simulink does have an option to include the signal bandwidth. For the simple BPSK system, here are the specs that I used - 1. Two - sided bandwidth...

Hello,I am trying to build a wideband frequency hopping OFDM system on Simulink. My OFDM system, along with subcarrier interleaving works fine otherwise. The problem...

Thank you very much. Right now I'm using Simulink for simulation but I plan to use RFSoC to implement wideband frequency hopping.

I'm using Simulink for my implementation. I used the in -built Block of the DUC and the DDC for my system. Yes, I obtained the spectrums before and after the DUC...

Hello! If I do not include the DUC and the DDC, I get a BER of 10^-4 at 12 dB SNR. The problem arises once I include the DUC and the DDC. My bandwidth of the ofdm...

Hello! Thank you for the reply. The system that I implemented where I basically simulated an OFDM system with subcarrier interleaving works completely fine if I...

Hello, I have developed an OFDM system that uses a DUC and a DDC for digitally up converting and down converting the OFDM symbols. I am trying to achieve wideband...

Thank you for the reply but sorry it doesn't fully answer my question. I wanted to know how to use the in-built OFDM Modulator block in Simulink

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