Inside Wireless: QAM modulation II - The Modulator

[@Rfelements]

How far would you say can QAM go? 2048, 4096... even further? 🤔

[@kazievan]

Hi, I like your videos and it is very informative. Are you from Sweden?

[@Rfelements]

@@kazievan Thanks, we are from Slovakia :)

[@tounsi7orr14]

commercial deployment actually : 16384

[@kyle5555]

Excellent video. I was a cable guy about a decade ago. Finally finishing up my electrical engineering degree next year. This makes so much more sense now when I was looking at constellation diagrams on my cable meter many years ago. I just knew that sharper meant better lol

[@hariharanvenkat9761]

Damn bro , this video was excellent man. Ive not seen the concept of IQ explained better anywhere else on the net so far. Thanks a lot you guys!!

[@Rfelements]

Thank you! We are happy the videos are useful.

[@nicolasmasson8569]

Thank you so much guys. In 10 minutes with you I understood crucial part of my studies

[@turrustam]

This is a good explanation and reference to those who still launching 4G and 5G sites with 30m height. For getting huger MCS and Modulation antennas should be very close to subscribers. I think 15 meter height is more than enough for 5G 3500mhz (sub-6) and without obstacles between antenna and user. Thanks for sharing your knowledge

[@rudylopez6546]

That was a great explanation!!! Keep up the great work! I've learned so much from these videos.

[@Rfelements]

We are very happy about that! That is the idea of the whole series!

[@sudanking99]

Great video, making everything so simple and interesting. Keep on and do more great tut .

[@Rfelements]

Thank you, we will do our best to keep it up!

[@martinlarsen8626]

Hi there, Your videos are really nice bro., they are short,informative,easy to understand and with very useful and conceptual animations......

[@vgeorge97]

Thank you these videos are great!

[@Rfelements]

Glad you like them!

[@algorithminc.8850]

Thanks. Good stuff. I look forward to scoping your channel. Subscribed. Cheers

[@bstanis1237]

Great work and explanation, thanks a lot; best Inside Wireless content in the world.

[@Rfelements]

Very flattering, 😊 thank you, we are glad the videos do good for people out there!

[@b1lleman]

Thank you this answers many question I had about QAM ;-) QAM FTW.

[@phannguyenvanha5786]

Thanks for this great explanation of the basics, very helpful.I come from in Viet Nam

[@Rfelements]

Greetings to Viet Nam, Phan.

[@dl569]

very clear, and easy to understand, thanks a lot

[@sabreenaalshooky2407]

Very clear explanation, thanks a lot

[@usamazahid1]

Amazing illustration..hats off

[@j_g_8391]

Thank you for an excellent video explaining this so clearly. I would only add that I believe SNR is signal power divided by noise power, not minus it, hence why it's called a ratio.

[@Rfelements]

You're welcome! Good catch by the way - it is not stated explicitly, but of course we assumed the log scale, so division in linear is subtraction in logarithmic..

[@j_g_8391]

@@Rfelements Ah I see! I don't work with RF so didn't realise that log scale typically used, thanks

[@andreac6472]

Great Work! Thank you Guys!

[@hatimbv5896]

My man!!! You should be a teacher :-) Awesome explanation

[@Rfelements]

Thanks! 😃

[@HICHEMZIMI]

amazing explanation ! thank you

[@melaro8846]

Great video 👍...but, how can QPSK be the same as 4QAM? After all, QPSK has no modulation of the amplitude. There is only one possible level of the amplitude, and the symbols are determined only by the phase shift, unlike for example 16QAM which has three levels of the amplitude (hence the name AM), in addition to the phase shift. Doesn't this mean that 4QAM must have two levels of amplitude, and only two levels of phase?

[@Rfelements]

Hello!. Unfortunately, it doesn't mean that. To have two amplitudes you will need to have them in the constellation diagram (lets say the X axis), and then one of them will be the strongest. In the constellation diagram we show here, which is the one used in 5GHz wireless networks, all the symbols are equally strongest when compared from the center. Also, when you search QPSK and 4QAM you get the same result (neither of them is much used as well). Thanks

[@CraigMullins1]

Awesome video

[@AshwaniKumar-ou4pw]

VERY good video

[@danielo6413]

great video thanks for creating it! However I think there might be an error, at 1:23 are displayed identical shapes, altough one arrives from 1 bit and the second from 0 bit, so they should be upside down shapes (or I miss something?)

[@i_am_GeeGee]

After the bit and carrier goes through the product modulator, what do you get? Is the carrier's phase and amplitude changed? If so how does it happen

[@alifrahmatullah4110]

Thanks a lot!

[@vgeorge97]

Should the position of the 10 and 11 be switched on the QPSK constellation diagram at 2:16?

[@Rfelements]

Hello!. It should not, is the correct way. You start counterclockwise and add +1 in each sector. Results are shown in binary. Thanks

[@vgeorge97]

Thanks for the reply:) So if the i and q amplitudes are both 1 then does it make a 45 degree angle with the x axis? If so then shouldn't this position correspond to the value 11? Based on the previous animation that showed 1s corresponding to an amplitude of 1 and 0s corresponding to an amplitude of -1.

[@eliasbeik7852]

well done

[@bhargavreddy8421]

Shrt and crisp👌

[@vlad87999]

Спасибо!

[@Rfelements]

now the IW videos have Russian subtitles as well, feel free to share with your friends / colleagues..

[@Luxcium]

🤍💙💔

[@jccp787]

I am a bit confused about something: It seems that in many diagrams out there, the incoming bitstreams into the mixers are labeled as I and Q, as if this digital data was in quadrature before getting applied to the mixer. However, based on this video, it looks like the data is not actually in quadrature until it mixes with the carriers which is in quadrature, since the 2 sinusoids are 90 degrees appart. So my question is the following: is the incoming bitstream in quadrature already? and if it is, is this a must?

[@Rfelements]

The bit stream at the entrance to the modulator is not in quadrature, you got it right, it's the two sin waves that are in quadrature..

[@HICHEMZIMI]

so usefull thank you

[@shja2008]

how to about RF elements cosider making 11 Ghz antennas ?

[@Rfelements]

Maybe in the future, for now we focus on lower frequencies though..

[@RogelioecastellanosGonzalez]

Un transistor npn con be y bc modula por así decir los impulsos acelerados y concomunitantes en la antena 2d

[@ehsanfaraji6347]

just wow

[@davidbosshart4448]

So it’s likely not worth paying more for a 1024 qam router vs 256 qam?

[@Rfelements]

router is one of the many devices in the chain... it depends if you have customers willing to pay for higher speeds, and if the hardware you use lets you leverage the high QAM rates..

[@davidbosshart4448]

@@Rfelements thanks. I ask because I purchased Costco’s Netgear RAXE450 wifi 6e router which has 256 QAM which is different then Netgear’s RAXE500 wifi 6e router that does have 1024 QAM. It was $100 cheaper. I was thinking of returning it to get the full benefits of wifi 6 and future proof with 6 gh band. Thanks

[@davidbosshart4448]

Thanks for responding. Correct the bandwidth is a bit lower, however does having only 256 qam still make the raxe450 a wifi 6 router? It is advertised as such but with 256 qam. Thanks again.

[@Rfelements]

@@davidbosshart4448 The product spec says it supports 802.11ax, which is marketed as wifi 6.

[@jimmysyar889]

Constellation plot is like a kmap sorta

[@Rfelements]

what K map do you mean?

[@ahemednor5201]

🌹🌹🌹

[@aidanabregov1412]

Comment for the algorithm

[@donghyunshin21]

These guys should start an educational institution

[@chtulurr]

sounds cool, too technical for me

[@Rfelements]

which part did you not understand? Maybe we can explain better..

[@Luxcium]

I don’t think it’s real… I see Imaginary numbers all over… it’s complex…

[@TheGmr140]

No real math in this explaination. No meat

[@mikerichardson6973]

This guy just can’t make the TH sound. “Da, udder, dis…” the, other, this.

[@Binoyxxx9]

🎉🎉 excellent 👍

[@asad2880]

Very useful video, thank you so much

[@shariulekab]

Very interesting video