Thank you for the explanation. Much clearer now. I would appreciate the R&S service manuals being as clear as this. Then I might be able to fix my R&S equipment.
Thanks for the great video! I still have one question though: At 0:29 you can see the face shift marked with the red circles. But: You stil have an electromagnetic wave right? When having a normal dipole antenna you cant just send two "low signals" right? Doesnt it have to be a oscillating waveform?
Hi John -- thanks for the question. You are correct that all RF is an oscillating waveform. That said, there are numerous ways of representing a "low" state with an oscillating waveform. For example, in ASK (amplitude shift keying), a "low" state is usually the lack of the oscillating waveform (!). In FSK (frequency shift keying), the "low" or "zero" state is usually the lowest discrete frequency used, and in PSK, a "low" state is somewhat arbitrarily defined as one of the phase states. In all cases (except the on-off ASK keying), an oscillating RF waveform is always present. Hope that helps!
The cases I have worked with in regards to BPSK is in RADAR pulsed RF applications. Despite the change in phase, the amplitude & frequency at 0 and 180 degrees will be the same. Except for the brief moment that it passes near the origin. The signal(sine wave) never stops radiating until the end of the pulse period. The easiest examples to understand are barker codes. Say you had an 11 bit barker code represented as +++---+--+- and a pulse duration of 11us. The pulse is active for 11us with the first 3us as 111 next 3us as 000. And so forth.
yea same, from what i gathered from my resources, DQPSK involves differential encoding and decoding of the signal to determine phase differences between symbols, the DQPSK scheme shown in the video looks more like pi/4 QPSK
Dude, thank you for your explanations and presentations. This video hepled me with questions from my teacher of theory radio technical signals. I didn't find russian books about this, but can you advice me any book? My English is not that good, but I think I can read and realize this. Thank you!
Thank you for this youtube university remains undefeated.
Brilliant! Super illustrative explanation about the how offsetting the constellation affects PAPR!
Thanks!
I kind of stumbled onto this video, knowing nothing about any of this, but you do a great job of explaining it
At 3:10, 011 on the negative side of the x-axis must be 001
Thank you for the explanation. Much clearer now.
I would appreciate the R&S service manuals being as clear as this. Then I might be able to fix my R&S equipment.
Thank you. Helped me study this for my Ham Radio exm
Congrats! 73 DE KO4LZ
Thanks for the great video! I still have one question though: At 0:29 you can see the face shift marked with the red circles. But: You stil have an electromagnetic wave right? When having a normal dipole antenna you cant just send two "low signals" right? Doesnt it have to be a oscillating waveform?
Hi John,
We've received your question, and we are routing it to one of our experts to assist you. We'll get back to you soon!
Hi John -- thanks for the question. You are correct that all RF is an oscillating waveform. That said, there are numerous ways of representing a "low" state with an oscillating waveform. For example, in ASK (amplitude shift keying), a "low" state is usually the lack of the oscillating waveform (!). In FSK (frequency shift keying), the "low" or "zero" state is usually the lowest discrete frequency used, and in PSK, a "low" state is somewhat arbitrarily defined as one of the phase states. In all cases (except the on-off ASK keying), an oscillating RF waveform is always present. Hope that helps!
The cases I have worked with in regards to BPSK is in RADAR pulsed RF applications. Despite the change in phase, the amplitude & frequency at 0 and 180 degrees will be the same. Except for the brief moment that it passes near the origin. The signal(sine wave) never stops radiating until the end of the pulse period. The easiest examples to understand are barker codes. Say you had an 11 bit barker code represented as +++---+--+- and a pulse duration of 11us. The pulse is active for 11us with the first 3us as 111 next 3us as 000. And so forth.
What an excellent video and explanation! Hats off!
Thank you!
thank thank u , im just havin a collage exam on this topic and this realy simpfiled what i studied and is a great recap of the psk modulation
Glad it helped - thanks for the feedback!
3:09
011 is mentioned twice . It would be [correct me if i am wrong] going clockwise 000 001 011 010 and so on
Good catch - yes, that is a typo and you are correct. Thanks!
excellent video
Thanks!
Amazing explication!
Thank you!
Hi. Is the differential QPSK you show is actually pi/4 QPSK because I read something different from other resources ?
yea same, from what i gathered from my resources, DQPSK involves differential encoding and decoding of the signal to determine phase differences between symbols, the DQPSK scheme shown in the video looks more like pi/4 QPSK
Dude, thank you for your explanations and presentations. This video hepled me with questions from my teacher of theory radio technical signals. I didn't find russian books about this, but can you advice me any book? My English is not that good, but I think I can read and realize this. Thank you!
great, thank you
Thanks
amazing
sir can you send me this presentation i need it.
Why don't you want to transition through the origin?
Thanks you
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