I used to do some SDR work (I designed SDR systems with FPGAs the previous decade) and part of it was also using gnuradio to test cards and protocols. I want to express my gratitude for taking the time and effort to upload those things.
Those new toys are awesome! 🙂 I checked out their website and they make really nice equipment! I hope you will show us all the possibilities in next videos --> more FREQuently! 😄
Dear Iain, thank you so much for your efforts. Could you please explain for us the difference between analog and digital beamforming from a theoretical and a practical point of view, and tell us what is the advantage of digital beamforming and why was it at first invented, as it is still not clear to me. Thank you so much.
Thanks Ian those were too wonderful videos of ofdm with lot of interesting insights.eventhough it gave more details of how those subcarriers are upconveterd but my basic query seems to be not fully addressed.below are few concepts for me to be more clear about this. As states earlier in the base band if cos leads by sin , the modulated symbol will go to the right part of spectrum while if the sin part leads the cos , then the modulated subcarrier goes to the left part of spectrum. But suppose I need to use a qpsk with 4 symbols to be used at say -15khz baseband and another +15khz baseband (like it's two different stations broadcasting) how can we ensure that both will not interfere when upconverted. How can we ensure that irrespective of whatever symbols we are modulating with -15khz always ensures that the sin component always leads and for the +15 kHz the cos component always leads by sin. As I can suppose if I take -15kz for modulating, then based on the values of modulating symbol the sin wave some times leads and sometime lags the case wave. So if the modulating symbols results in leading cos wave , after upconvertion this will go to right part of spectrum which will interfere with the symbols modulated with +15khz.how can we guarantee that whatever symbols are transmitted from +15khz and -15 kHz falls on the correct part of spectrum irrespective of the whatever the modulated data is ?can you pls throw some more light with some example say using qpsk with all 4 symbols can be trsamitted separately with +15khz and -15khz and never interfere with each other
It's a great question. And unfortunately I don't have an intuitive answer for you right now. I'll have to think about it (bit busy at the moment ...) From a high level though, when the baseband is up-converted, the -15kHz and +15kHz channels in your example, will occupy two different sub channel frequency ranges, centred at fc-15 and fc+15. So that's four degrees of freedom (sin and cos at two frequencies each). So that matches with what's needed to send two complex numbers (constellation points).
Great video!! Thanks. Q: when u calibrate between 1 and 3 and say you have a phase change for 1 wont that affect the previous calibration? How would you deal with this situation? Thanks.
Honestly, You have one of the best (if not the best) channel in the field of communication
I'm so glad you like the channel.
I used to do some SDR work (I designed SDR systems with FPGAs the previous decade) and part of it was also using gnuradio to test cards and protocols.
I want to express my gratitude for taking the time and effort to upload those things.
Thanks. It's great to hear what viewers have dome previously. I'm glad you like the videos.
I always thought I am a geek, until I started watching your videos. I am officially a nerd now. Also, thanks for sharing!
I'm glad you liked the video.
Thanks for your videos, they are very helpful for learning!
Glad you like them!
Would please consider creating a beamforming playlist on this channel ?
Thank you for you favorable consideration .
Regards.
Thanks for the suggestion! I've just done it.
@@iain_explains Thank you for your for your favorable consideration.
Dear Iain
This video is amazing 🤩
Thanks for always providing with us good videos!
Glad you enjoyed it!
Good to see you Prof with live view 😀
I'm glad you liked it. You can see that my hands are attached to a body! 🤣
Those new toys are awesome! 🙂
I checked out their website and they make really nice equipment!
I hope you will show us all the possibilities in next videos --> more FREQuently! 😄
Glad you liked the video. I'll have more like this coming soon.
Dear Iain, thank you so much for your efforts.
Could you please explain for us the difference between analog and digital beamforming from a theoretical and a practical point of view, and tell us what is the advantage of digital beamforming and why was it at first invented, as it is still not clear to me.
Thank you so much.
This video will hopefully help: "What is Hybrid Beamforming?" ruclips.net/video/vJrDtZ24K7Q/видео.html
Thanks Ian those were too wonderful videos of ofdm with lot of interesting insights.eventhough it gave more details of how those subcarriers are upconveterd but my basic query seems to be not fully addressed.below are few concepts for me to be more clear about this. As states earlier in the base band if cos leads by sin , the modulated symbol will go to the right part of spectrum while if the sin part leads the cos , then the modulated subcarrier goes to the left part of spectrum. But suppose I need to use a qpsk with 4 symbols to be used at say -15khz baseband and another +15khz baseband (like it's two different stations broadcasting) how can we ensure that both will not interfere when upconverted. How can we ensure that irrespective of whatever symbols we are modulating with -15khz always ensures that the sin component always leads and for the +15 kHz the cos component always leads by sin. As I can suppose if I take -15kz for modulating, then based on the values of modulating symbol the sin wave some times leads and sometime lags the case wave. So if the modulating symbols results in leading cos wave , after upconvertion this will go to right part of spectrum which will interfere with the symbols modulated with +15khz.how can we guarantee that whatever symbols are transmitted from +15khz and -15 kHz falls on the correct part of spectrum irrespective of the whatever the modulated data is ?can you pls throw some more light with some example say using qpsk with all 4 symbols can be trsamitted separately with +15khz and -15khz and never interfere with each other
It's a great question. And unfortunately I don't have an intuitive answer for you right now. I'll have to think about it (bit busy at the moment ...) From a high level though, when the baseband is up-converted, the -15kHz and +15kHz channels in your example, will occupy two different sub channel frequency ranges, centred at fc-15 and fc+15. So that's four degrees of freedom (sin and cos at two frequencies each). So that matches with what's needed to send two complex numbers (constellation points).
Great video!! Thanks. Q: when u calibrate between 1 and 3 and say you have a phase change for 1 wont that affect the previous calibration? How would you deal with this situation? Thanks.
You'd keep the phase of channel 1 fixed, and only adjust the phases of the other channels.
Thanks for not having a bloody Apple Symbol shown. I loce these Videos
Glad you like them.
I love your videos so much , (a nuclear bomb of information)
That's great to hear.
Honestly, You have one of the best (if not the best) channel in the field of communication
That's great to hear. I'm so glad you like the channel.