FHSS - Frequency Hopping Spread Spectrum

In 802.11 standards, three different modulation/transmission methods are used to transmit wireless signals: 1) Frequency Hopping Spread Spectrum, or FHSS; 2) Direct Sequence Spread Spectrum, or DSSS, and 3) Orthogonal Frequency Division Multiplexing, or OFDM.
These techniques are used for several reasons, including the reduction of natural interference, noise and jamming, and prevention of detection and interception.
In this lesson, I will focus on one of spread spectrum modulation methods used in wireless communications: Frequency-Hopping Spread Spectrum, or FHSS.
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Sunny Classroom

[@sadunkumara3699]

My lecturer took two hours to explain this simple thing. Thank you. May u live long

[@pattty847]

why can't youtube offer degrees?

[@oUtLawMaNia]

The most underrated lecturer on the internet! You put things into perspectives that are so easy to grasp, thank you very much!

[@20SG20]

Plain, simple, and to point.
I respect you, Professor Sunny. ❤️‍🔥.

[@talismanicac]

The simplest and easy to understand concept of DSSS & FHSS by you on youtube. ♥️

[@larryshulman8845]

excellent video series, probably one of the best I have ever seen , clear, imaging based, understandable for an old engineer like me that responds to visuals first and math 2nd.

[@gabodiaz984]

Please Teacher Sunny !!!! Dont stop to make videos . These are really easy and interesting to get them

[@sunnyclassroom24]

Thank you for supporting !

[@danielbradley753]

This is great, your voice is very clear and concise through the video and the explanation seems obvious 🎉 Just why I need

[@sunnyclassroom24]

Great to hear!

[@junwenteh]

Simple and straight to the point, thank you!

[@RaviKumar-mf8kk]

Thank you very much for the simplification in such a short and nice video.

[@sunnyclassroom24]

You re welcome !

[@Icefy_2024]

I Love It When The Notification Comes, "Someone Has Subscribed Your Channel" 😁 It Always Makes My Day!

[@TheSkyLegend]

Just a simple correction here.
The time that you mentioned as the Hop time is the Dwell time.
The Hop time is the amount of time needed to move from one frequency to another, which does not exist in your graph.

[@slickrgl]

Hedy Lamarr sent me here. Amazing invention. 👌

[@sunnyclassroom24]

Thank you for watching!

[@silverbell6160]

I love your explanations, they are so clear and simple. Great!

[@mariodelzo]

Thank you so much, I was reading a whole book for many hours, but with this video I just take 5 minutes to ilustrate the ideas very clear and summarize. Hope find more videos of other topics with this didactic , well done!!

[@sunnyclassroom24]

Wonderful!

[@aaaaa2332]

Hello sunny it was a really nice lecture. Short and sweet. Please make a video on ofdm

[@sunnyclassroom24]

I will. It is on my to-do-list. I will upload it soon, hopefully.

[@aaaaa2332]

@@sunnyclassroom24 thanks for your quick response.

[@sunnyclassroom24]

No problem. I normally answer within 24 hours unless I travel or business trip.

[@sunnyclassroom24]

OFDM - Orthogonal Frequency Division Multiplexing
I do not know if you watched it on my channel.

[@rohailmohmand502]

You put the whole sea in a single glass. That’s magnificent

[@JimK0QJC]

Very good. Your graphics are excellent. Thank you.

[@MrNandu32]

Great information about the FH.

[@sharvind8852]

Thank you so much for this very simple explanation.

[@vighneshnayaks7379]

Thanks a lot, got to know FHSS at superficial level, and did better job than my lecturer.

[@antoniopintus8568]

Just great! thank you very much for sharing those classes! top!!!

[@sunnyclassroom24]

My pleasure!

[@flywithtb5005]

Whats nice about non-native english speakers is that they speak simple to understand sentences and don't use informal speech. And that actually makes it easier for non-native speakers to understand.

[@brunatogomes1627]

the best expanations i have ever seen

[@Anonymous-ed4id]

This is so beautifully explained!

[@beTrollakod00]

Clear and simple. Thank you!

[@sunnyclassroom24]

You're welcome!

[@aitbouslamkarima2687]

Thank you very much for the simplification

[@RagibShahariar]

I wish you had released these videos in my undergrad -_- God bless.

[@isaiah_polocity2516]

Very simple explanation.. thank you so much

[@aneupan]

Very well explained. I liked that you videos are short, but at the same time very detailed. You've earned a subscriber. And, please make the future videos shorter too. Thank you.

[@sunnyclassroom24]

Thank you ! you made my day!

[@kenjboyd6233]

Thanks for making this clear!

[@etcher-lf6972]

Looks so clear now
Thank youuuu

[@Onvervain__]

Very easily explained 🔥

[@stevenshakes978]

Thank you Sunny!

[@mohammedmuddassir7170]

Excellent explanation..

[@javierlujan9249]

Thank you for your easy explanation, this is really helping me a lot, thank you sir

[@sunnyclassroom24]

You are very welcome!

[@AkashMuralidharan]

Thank you sunny sir🙏🏻

[@nilshrestha9147]

i think the data packet doesnot jump to another frequency in the middle of transmission,instead i think the user data packets are send in a certain sequence using the various small channels ,and through which channel it will go is already decided before sending

[@NaqeebAl]

Thank you Sunny, some of the best explanations on UA-cam. It's clear that you spend time and care in making the animations for these videos and it's nice to see the tens of thousands of people who benefit from them.

[@sunnyclassroom24]

Wow, thanks! That is my passion to do .

[@alicegeorge8757]

Thank you, that was very helpful!

[@mortenlund1418]

I see this is a security benefit, but is it also benefitting regarding interferrence? That I dont see?

[@sunnyclassroom24]

because there is a pattern in hopping, and noise or other interference do not have a pattern. When the receiver gets the signals, they can retrieve original signals and get rid of noises.

[@rvscootin3457]

Excellent example - Thanks!

[@NerdyDumbProductions]

Thank you again Sunny, love your lectures :)

[@cenkcaba5757]

thank you so much. very nice

[@arunbabu7856]

Clear and simple 👍

[@tuxuday]

How a packet once sent by the sender, can hop to different frequency before reaching the receiver? Changing frequency requires energy! So i reckon once a packet is sent it will be in the same frequency. Maybe the next packet will be in different frequency.

[@mortenlund1418]

He means the packet is divided and send partly on the different channels.

[@juanwallace3053]

@@mortenlund1418 Thank you!

[@romansteinebrunner5735]

A packet is always sent on one frequency, but the next packet will be on another Channel. As you Said, the frequency of an Already sent packet Canon be changed

[@임주혁-i4j]

Thanks to you! I understood it very well :D

[@ShikshaThisSide]

Wao very well explained . thank-you soooooo much.

[@sunnyclassroom24]

You are very very welcome!

[@electronicprojecttutorial]

Very clear explanation!

[@Toto-cm5ux]

Very interesting but how does the receiver know the hopping-pattern in FHSS WiFi technology ?

[@arjunarvind2178]

nicely explained

[@sunnyclassroom24]

Thank you 😃

[@simi7701]

congrats for your 100k subscriber!

[@maxheadrom3088]

One question: the packages change frequencies or the sender and receiver change the frequency used for each package? I mean, a package sent in F2 will always travel in F2 but the next package will be sent through F5 and so on. Thanks!

[@dennisasamoah2213]

wonderful as always

[@cokeforever]

Good video, great teching skills!

[@violinvvv]

Very clear, thank you

[@heritagerunner-mubarakmand1605]

Great video Sunny. Keep it up!

[@sunnyclassroom24]

Thank you for watching!

[@fabricegosnet9569]

Very well explained, good job and thank you!

[@rasswanth4968]

Good Lecture Sir.

[@fernandoaaff]

Excellent video! I can't thank you enough

[@anandprakash9457]

Sunny Sir, what if the eavesdropper is listening on all the 79 channels ?

[@Constitution1789]

So it's relatively secure? Better or the same as DECT 6.0?

[@leo.valentyme.604]

Thank you for making it easy

[@tanmoydutta5846]

Btw, nice and short lecture to explain the concept..... good job

[@sunnyclassroom24]

It's my pleasure

[@aswiniv6428]

very nice, thank you so much sir

[@rohullahhussaini3351]

thanks Sunny, you're awesome

[@sunnyclassroom24]

Thanks a lot.

[@arunwuppuluri]

Nice one Sunny !!

[@sunnyclassroom24]

Thanks a lot.

[@iam_saturn]

Very helpful ...thankyou

[@sunnyclassroom24]

My pleasure 😊

[@krishamehta8789]

This was helpful. Thanks

[@mayurgare]

Thank You Sir.

[@sunnyclassroom24]

You are most welcome

[@mdabulkasem2053]

Nice tutorial, thanks a lot

[@sunnyclassroom24]

You are welcome.

[@lahirureshanwanniachchi9065]

Nice tutorial

[@sunnyclassroom24]

Thank you!

[@midhunmadhavan7402]

Nice Explanation THANK YOU

[@hafissafwan]

Good explanation
better use 1.25 speed while watching

[@sunnyclassroom24]

Thank you for supporting!

[@bingbingsun6304]

Very clear explanation, subscirbed.

[@jakubadamczewski3477]

Another amazing video, thank You!

[@sheharanshrestha9382]

Why was the 2.4GHz frequency band divided into 79 narrow frequency channels? Why not 83.5 narrow frequency channels since the difference between 2.4Ghz and 2.4835GHz is 83.5MHz where each channel was considered to be 1MHz wide.

[@KellenSantana-s7r]

Excellent ❤

[@rasydanghani6995]

Very well explained..thank you very much!

[@sunnyclassroom24]

you are welcome!

[@natsagnyamnamkhai749]

super
well done

[@sunnyclassroom24]

Thanks

[@tanmoydutta5846]

But I have one question: How can data transmission signal change its frequency abruptly "during transmission"???? Isn't frequency change done from devices?

[@fraserbc]

There's a mistake in this video. What he is calling hop time is actually dwell time and the time inbetween transmissions is hop time which isn't shown on this graph

[@needsomehike]

is it used today in our wireless 2.4-5 GHz wireless networks?

[@mattlane1573]

Your videos are great as always and your my go to UA-camr.
Having watched some of your videos about Wi-Fi i'm a bit confused now, how do the channels of 1 6 and 11 fit into all of this?

[@sunnyclassroom24]

It is beyond networking basic understanding. I wish I could be able to explain.

[@Yasar4ever]

Dear Sunny, please upload more video regarding the wireless concepts (i.e CWNA)

[@ANALOGTecHII]

What is the time of hopping in GSM voice signal

[@mohsenmazandarani7506]

Thank you.....Perfect

[@geekmuralin]

Thank you sir 🙏

[@gaurideshpande1844]

very nice sir!

[@sunnyclassroom24]

Thanks a lot.

[@sarangkottummal5463]

you are the best!

[@girikgarg1268]

Nice video!

[@puneetkour9327]

Very cute lecture

[@sunnyclassroom24]

Thanks.

[@augmentos]

Are there any military jammers that can block FHSS without blocking all frequencies?

[@fraserbc]

If you can predict what the next channel is then yes but the crytographic algorithms and keys which determine that are closely guarded secrets

[@augmentos]

@@fraserbc so you are saying essentially FHSS would be impervious to gov scanners on an unpredictable Algo?

[@Cyberfako]

I would like to ask how reciever know the changed frequency ? Reciever listen depends on what in this protocol ?

[@cheelikumar]

great work SUNNY SIR.Make video on INTER SYMBOL INTERFERENCEI,EYE PATTERN ....

[@rsstnnr76]

How does it jump though?

[@abhilashbs1021]

Good lecture 🙌🙌

[@pogo55555]

OMG. Liked. Subscribed.

[@shreyaskaup]

Put speed 2x for normal speed

[@godlessmankind4142]

Amazing thanks

[@sunnyclassroom24]

You are welcome!

[@bhuvaraga]

Question: How does the receiver know what pattern is used for this transmission? Is it first sent and agreed before transmission?

[@jeffreydijkstra3391]

Both receiver and sender have a predifined hopping sequence not knows by other devices

[@aniketkale449]

Sir what if two different signals land on the same channel at the same time.
For example, signal S1 and another one S2 use the same channel F2 at the same time T3.