at 8:03 guard bands are there in fdm not because of ISI. They are there because our filters cannot produce perfect edges. And ISI is a phenomenon of spreading in time domain... not in frequency domain.
Please check if there is 0 overlapping in the case of ISI in frequency domain. I will soon come with the detailed discussion on ISI, it's time domain as well as frequency domain representation. The problem that I encounter is that we make ourselves feel great only after thinking others are down. I will be more than happy if you will come up with the detailed explanation of this topic and help students learn the same while not involving the name of our country.
Wi-MAX stands for Worldwide Interoperability 'for Microwave Access. It is a wireless communication medium and telecommunication protocol, which is used in mobile internet. ; A medium used instead of cable and DSL to provide data. Currently the speed of Wi-MAX is 40 Mbit / s which can be increased to 1 G'bit / s. Using the Wi-MAX FORUM in 2001. At present Banglalion as a broadband in our country. Qubee Wi-MAX is being used. It uses full duplexing mode and at the same time provides multi-functional benefits. The Wi-MAX system has two main parts, namely - 1) Wi-MAX base station 2) Wi-MAX receiver
I have already explained how bandwidth is expanded in DSSS Please watch the video on DSSS, things will become more clear.. Thanks for your feedback and for connecting
OFDMA = orthogonal Frequency Division Multi Access. The key word is orthogonal... Orthogonal means 90 degree... What you have explained is good but not exactly to the point...OFDMA allows to transmitters to use the same carrier frequency phase shifted by 90. This is due to the mixer property where carrier is muktipled with the modulated signal to retrieve the base band. As you do mathematical calculations. It turns out to be a dot product... So if the actual signal is 90 phase apart from the carrier signal it lead to zero output
ODFM over powerlines causes severe interferrence , basically you're transmitting on frequency's you're not allowed to transmit on ....... for this reason people who are using it should qualify for radio piracy ....... these signals are so worsly filtered i can hear their harmonics in 40 Mhz ........ we are working on way to disturb this , arcing proves to be sufficent ............. plc can not exchange information with arcs on the line .
Bandwidth and Trasmission speed has nothing to do with each other. I think you meant the amount of data present in the channel at an instant is more in the case of OFDMA. Thanks
I am glad it helped you.. I will try to cover more topics as time allows me.. I hope you will stay connected for upcoming videos.. Thanks for feedback..
Thankyou mam this video is very informative, Actully i want to know about use of orthogonality in more detailed like how orthogonal frames can be used in multiplexing techniqe or multiple acess communication. Please guide me, i will email you also seprately.
What is the relation between delay time and Bandwidth? I think it should be bit period or pulse width not delay time. As per my knowledge, Bandwidth is decided by pulse width not delay time. i.e. If bandwidth is large, data rate will increase and hence, pulse width/bit period decreases and more bits will be transferred in same interval of time.
Please can you help me to solve this problem Consider an 8-tap FIR equalizer. (a) When the channel coefficients are [1, 0.8] (delays separated by a symbol period), determine the optimum equalizer weight vector. You can either derive it from the z-transform or from the MMSE approach. (b) Plot the real part of the weight vector and comment on its shape and how it is related to the channel coefficients Thank you very much and I appreciate your help
The full form of wi-MAX is worldwide interoperability for microwave access. It is a wireless means of communication and telecommunication protocol, which is used in mobile internet. Instead of cable and DSL, it is a medium used to provide data. Currently the speed of Wi-MAX is 40 mbit / s which can be increased to 1 Gbit / s. In 2001, the name Wi-MAX was first used in the Wi-MAX Forum.
i have learnt that ofdma do not wast frequent band.if someone disconnect ofdma connection, this channel can be reuse by another device.every block of time-frequency graph can shorter or can bigger for each users.bigger for large data rated purchased user and shorter area for lower bandwith purchased user?? am i right sis??
In 3:57, you said "First symbol", and "second symbol" part (i). Are they same frequency? In (ii), how different frequency interfering another frequency (f1 and f2)? In (iii), how the fading occurs?
Thanks shiv Patel for replying I don't get much time to reply each and every comment. Thanks for your great work Thanks Sarfaraz for connecting with us
in multipath freq took multiple path to reach at rx due to some geo conditions that time n while it reaches on rx side some of the freq maybe out of phase which result in weakening of signal
@@nBoxit firstly, it is tough for me to decode the shortened English. Request you to make it clear. Secondly, make precise statements and avoid statements like "some geo conditions". Instead say, "due to scattering etc". Lastly, giving some references, if possible, can help.
Thank you mam ❤️❤️❤️❤️❤️ helped alot in my exam💖💖💖💖 best explanation on internet 💖💖💖💖💖 Kind suggestion for you mam dont read comments just upload your content we support you💗💗💗💗💗💗💗💗💗 Thank you so much for efforts🌹🌹🌹🌹🌹🌹🌹
Madam now we are in 2021, could you please upload the second part of OFDM.Because we are depend on you. I didnt know anything about telecommunication even a one single word.But I found your channel and started from your amazing videos.Please be kind enough to continue this channel too far.Because students like me depend on you.Thank you very much madam with best wishes.
Fourier transform of rect pulse is sinc and line encoding is done which results in rect signals.. Thus it's Fourier transform will give sinc pulse.. Thanks for connecting
Sis is just copying Aditya K Jagannathan lectures . Please watch those lecture you'll have much clear idea. Everyone comes here to watch the sis , not to learn . Lol 😂😂😂😂😂😂
@@rationalindian7516 i love you bro!! but bro i have one confusion. downlink in lte ofdma,up link in lte sc -fdma now my question is, both uplink and downlink in 802.11n use ofdma?? why uplink in lte use sc fdma??
I will be more happy if you have said that for the content I have provided.. Anyway thank you so much for connecting.. I hope my content will help you in future.. Stay connected for upcoming videos
Through the entire vdo i can only see your long hair honestly speaking mam i know you have a long hair but i think this is not the right place to show it of because of it our attention is got distracted.... a true suggestion from my end that please make vdo clean and clear 1st students focus should only the blackboard. thanks
![Orthogonal Frequency Division Multiplexing - OFDM | Wireless Communication [English]](http://i.ytimg.com/vi/pUzurHbPpqQ/mqdefault.jpg)
![Orthogonal Frequency Division Multiplexing - OFDM | Wireless Communication [English]](/img/tr.png)
beauty with information can make more understandable and informative.
Thank you for your nice explanation. God bless you.
Beauty with brains ❤
at 8:03 guard bands are there in fdm not because of ISI. They are there because our filters cannot produce perfect edges. And ISI is a phenomenon of spreading in time domain... not in frequency domain.
Please check if there is 0 overlapping in the case of ISI in frequency domain.
I will soon come with the detailed discussion on ISI, it's time domain as well as frequency domain representation.
The problem that I encounter is that we make ourselves feel great only after thinking others are down. I will be more than happy if you will come up with the detailed explanation of this topic and help students learn the same while not involving the name of our country.
Thanks mam you explained it very beautifuly in simple manner.
Thanks for your feedback..
Stay connected for upcoming videos..
Wi-MAX stands for Worldwide Interoperability 'for Microwave Access. It is a wireless communication medium and telecommunication protocol, which is used in mobile internet. ; A medium used instead of cable and DSL to provide data. Currently the speed of Wi-MAX is 40 Mbit / s which can be increased to 1 G'bit / s. Using the Wi-MAX FORUM in 2001. At present Banglalion as a broadband in our country. Qubee Wi-MAX is being used. It uses full duplexing mode and at the same time provides multi-functional benefits. The Wi-MAX system has two main parts, namely - 1) Wi-MAX base station 2) Wi-MAX receiver
Thank you so much for your valuable information..
I will surely share this on my channel in upcoming videos
Thanks for connecting
i love my teacher
Thank you mam great explanation
very good class ma'am understand completely. thank u
Super explanation
Thanks for such a wonderful explanation
Thanks for this video... One small query how the bandwidth is reduced to 20MHz in OFDM modulation from 22Mhz in DSSS
I have already explained how bandwidth is expanded in DSSS
Please watch the video on DSSS, things will become more clear..
Thanks for your feedback and for connecting
Well explained there sister.Thank you very much.
Guard bands r imp to overcome ISI. Then y OFDM neglects it? How is it an advantage?
OFDMA = orthogonal Frequency Division Multi Access. The key word is orthogonal... Orthogonal means 90 degree... What you have explained is good but not exactly to the point...OFDMA allows to transmitters to use the same carrier frequency phase shifted by 90. This is due to the mixer property where carrier is muktipled with the modulated signal to retrieve the base band. As you do mathematical calculations. It turns out to be a dot product... So if the actual signal is 90 phase apart from the carrier signal it lead to zero output
Thank you ma'am it was very useful 🤗
Madam you Discuss more about OFDM...above lecture is covering only advantages and disadvantages only...Thanks in advance 💐
Yes I will discuss more about ofdm in the part 2 of this video..
Thanks for your feedback and thanks for connecting
Love you madem your teaching 💕
ODFM over powerlines causes severe interferrence , basically you're transmitting on frequency's you're not allowed to transmit on ....... for this reason people who are using it should qualify for radio piracy ....... these signals are so worsly filtered i can hear their harmonics in 40 Mhz ........ we are working on way to disturb this , arcing proves to be sufficent ............. plc can not exchange information with arcs on the line .
Well done ! Greetings from El Salvador
Hi .
Thanks for your feedback and for connecting..
Stay connected for upcoming videos
hi, hope you will be safe and sound. Mam, i have some doubts about my OFDM circuit diagram. Can you please help me with that?
great lecture thanks
Why there is no cross-connection in OFDM as there is no guard band
Great knowledge and very helpful video 👍
Bandwidth and Trasmission speed has nothing to do with each other. I think you meant the amount of data present in the channel at an instant is more in the case of OFDMA.
Thanks
Well explained mam ..I request you to plz cover up all communication .thank you
I am glad it helped you..
I will try to cover more topics as time allows me..
I hope you will stay connected for upcoming videos..
Thanks for feedback..
@@VaishaliKikan sure mam I will always be connected because you teach us well ..Thanks alot again
Watch the entire lecture set on wireless communication. It was very helpful
Thank you
I am glad it helped you..
I hope you will stay connected for upcoming videos..
Thanks for feedback..
It's very informatics. Thank you for the session.
Kitni bhayankar teacher hai 🌝
Nice Explaination
Thanks for your feedback and thanks for connecting
7:30 Gaurd band in frequency domain has nothing to do with ISI (in time domaim). Apparently, she has no understanding on what she is talking.
Abe saale tu yahan padhai karne aya hai? 😂😂😂
@@vrj-uu7te No I am not a student. If you are, better talk about the content and not about persons. By the way I am not good at Hindi.
what are orthogonsal carriers...?
samajh toh nahi aaya pr dekh kar aacha laga !!!!
I hope the upcoming videos will be helpful
Thanks for connecting
Wow❤
Thankyou mam this video is very informative, Actully i want to know about use of orthogonality in more detailed like how orthogonal frames can be used in multiplexing techniqe or multiple acess communication. Please guide me, i will email you also seprately.
Nice explanation
Why we are going for orthogonality and what is it..any advantages..kindly describe prooerly mam..its short lecture
Thank you from SBSSTC
What's this ??
Plz explain Block diagram of ofdma both uplink nd downlink tranmitter and reciever section maam
Yes i will soon make the part 2 and will explain more in that
Thanks for connecting
Mam you are so beautiful✨. That even I can't concentrate on topic! 😅
What is the relation between delay time and Bandwidth? I think it should be bit period or pulse width not delay time. As per my knowledge, Bandwidth is decided by pulse width not delay time. i.e. If bandwidth is large, data rate will increase and hence, pulse width/bit period decreases and more bits will be transferred in same interval of time.
how about NOMA non orthogonal multiple access, it used for 5G
Yes it is used in 5G and has better bandwidth efficiency..
@@VaishaliKikan thank you for your interesting, i am waiting your course in wireless communication,
This is NOMA, the POWER DIVISION MULTIPLE ACCESS
Mam can u suggest one good book for wireless communication so that it would cover all concepts like Multiple access techniques too..
wireless communications andreas f molisch . Second edition. Its cover all wireless topic with detail.
@@smartups1 is it available on online for free..
@@EEBPATNALANAGASAI yes it's available in PDF and also free.
Thanks Asif Ashraf for this help ..
I don't get the chance to reply each and every comment..
Thanks for your feedback and for connecting
Post a video on Fermats principle
Plss
I will try to do it in future
Thanks for connecting
There is no notes of this class which you have given the link below in description
It is present in wireless communication folder
drive.google.com/file/d/1kiCF-Asa4zGi3jTHSfsGecv3eIq9AapU/view?usp=drivesdk
Thanks for connecting
My exam is over sir😅😅 thank you
Please can you help me to solve this problem
Consider an 8-tap FIR equalizer.
(a) When the channel coefficients are [1, 0.8] (delays separated by a symbol period), determine the optimum equalizer weight vector. You can either derive it from the z-transform or from the MMSE
approach.
(b) Plot the real part of the weight vector and comment on its shape and how it is related to the channel coefficients
Thank you very much and I appreciate your help
I will try to solve it soon..
Thank you so much for your valuable feedback..
Stay connected for upcoming videos..
The full form of wi-MAX is worldwide interoperability for microwave access. It is a wireless means of communication and telecommunication protocol, which is used in mobile internet. Instead of cable and DSL, it is a medium used to provide data. Currently the speed of Wi-MAX is 40 mbit / s which can be increased to 1 Gbit / s. In 2001, the name Wi-MAX was first used in the Wi-MAX Forum.
ACS all subject plz try to make videos on some imp topics
I will soon try to make videos on all important topics
Thanks for connecting
WHICH CHANNEL OFDMA ITS WORK??
Nicely explained 🙂
I love u mam ❤️
Time Hopping Impulse radio pe bhi ek video bana dijiye. Thank you.
I will soon try to do it
Thanks for connecting
Nehi bana sakte , kyuinki Aditya K Jagannathan ne nehi padai hai. Akj jo padata hai usika video relaying karte hain ye madam
i have learnt that ofdma do not wast frequent band.if someone disconnect ofdma connection, this channel can be reuse by another device.every block of time-frequency graph can shorter or can bigger for each users.bigger for large data rated purchased user and shorter area for lower bandwith purchased user?? am i right sis??
Good explanation.. could you please make videos on ofdma and scfdma
I will try to make the video lecture on these topics..
Stay connected for upcoming videos..
And thank you so much for your feedback..
What subject is this..??
Nice explanation madam
Thanks for your feedback and thanks for connecting
Wah 🙏mam
In 3:57, you said "First symbol", and "second symbol" part (i). Are they same frequency? In (ii), how different frequency interfering another frequency (f1 and f2)? In (iii), how the fading occurs?
Totally time saver before exam and easy way to learn ofdm👌
Well, Mam thank you so much mara project ha is pa Wireless communication course ka. Can you plz also explain the matlab code of OFDM. #Pakistan
I will try to do that...
Thank you so much for your valuable feedback..
Stay connected for upcoming videos..
@@VaishaliKikan Thank you so much.
@@VaishaliKikan Be quick Mam plz I have only two weeks.
আপু সিম্বল রেট কি বিভিন্ন ইউজারের জন্য ভিন্ন হয়??symbol rate is difference for every user?
social media aur video calling me konsi technology use hoti hai
4g
Thanks shiv Patel for replying
I don't get much time to reply each and every comment.
Thanks for your great work
Thanks Sarfaraz for connecting with us
thanks 👍
Can u pls provide code for simulation of OFDMA
5:28 Multipath fading (i) is same as frequency selectivity(iii).
no
in multipath freq took multiple path to reach at rx due to some geo conditions that time n while it reaches on rx side some of the freq maybe out of phase which result in weakening of signal
@@nBoxit firstly, it is tough for me to decode the shortened English. Request you to make it clear. Secondly, make precise statements and avoid statements like "some geo conditions". Instead say, "due to scattering etc". Lastly, giving some references, if possible, can help.
Ponnu solli kudatha pothumae🌚
Thank you mam ❤️❤️❤️❤️❤️ helped alot in my exam💖💖💖💖 best explanation on internet 💖💖💖💖💖
Kind suggestion for you mam dont read comments just upload your content we support you💗💗💗💗💗💗💗💗💗
Thank you so much for efforts🌹🌹🌹🌹🌹🌹🌹
Hello Vaishali Madam, can you please teach calculus...?
I will try to do it soon..
Thank you so much for your valuable feedback..
Stay connected for upcoming videos..
Can you explain FBMC
I will try to do it ASAP
Thanks for connecting
Nice explanation ... #HariKrishnaSahu
Thank you so much for your valuable feedback..
Stay connected for upcoming videos...
Madam now we are in 2021, could you please upload the second part of OFDM.Because we are depend on you. I didnt know anything about telecommunication even a one single word.But I found your channel and started from your amazing videos.Please be kind enough to continue this channel too far.Because students like me depend on you.Thank you very much madam with best wishes.
Ma'am ap hindi mai bhi thoda explain karo
For getting the sinc function we are going to implement the fourier transform on user data Mam plz explain...
Fourier transform of rect pulse is sinc and line encoding is done which results in rect signals..
Thus it's Fourier transform will give sinc pulse..
Thanks for connecting
concept isn't clear
I hope the upcoming videos will help you
Thanks for connecting
sis what about sc fdma??
f1 and f2 are different frequencies and multipath delay is in time domain how time delayed f1 signal will interfere with f2
U r so beautiful madam!
hello sis,does wifi 802.11n use same the technique like lte??
i know mimo is different thing. are mimo and ofdma being combined in wifi 802.11n?
Yes .. 802.11n use OFDM MIMO, where each antenna at the transmitter side sends their own OFDM symbol independently.
Sis is just copying Aditya K Jagannathan lectures . Please watch those lecture you'll have much clear idea. Everyone comes here to watch the sis , not to learn . Lol 😂😂😂😂😂😂
@@rationalindian7516 i love you bro!! but bro i have one confusion. downlink in lte ofdma,up link in lte sc -fdma now my question is, both uplink and downlink in 802.11n use ofdma??
why uplink in lte use sc fdma??
OFDM with mathematical representation. And it's generation and demodulation pe bhi bna doo video?
Sure I will soon work upon it
Thanks for connecting
U don’t mention anything about delay spread ;coherence BW ; also the ISI u mentioned: why don’t u strike out whether it is limited ISI or not.
sorry what ?
Although, it's not my topic to be covered, but still i watched your video till last sec. coz u r so beautiful ❣️
I will be more happy if you have said that for the content I have provided..
Anyway thank you so much for connecting..
I hope my content will help you in future..
Stay connected for upcoming videos
no idea about that your content will help me in future or not, but inspite of oll these, I'll be connected to your channel, to see you. ❤️
Thank you so much
no need! Just stay beautiful as you are. ❣️
If you don't mind, can i suggest you one thing regarding your next youtube video?
Pls explain about fading and its types
Love ❤️ from Nepal.
Hate from ap
Can you download Arabic translation with the video? Thank you
I will try to do that..
Thank you so much for your valuable feedback..
Stay connected for upcoming videos..
@@VaishaliKikan Ok
good luck
what About (PADMA) POWER DIVISION MULTIPLE ACCESS (please)
I will try to make videos on that as well.
Stay connected for upcoming videos..
Thank you
is p baqi videos kb ayengi ?
I will soon make more videos on this
Thanks for connecting
hindi me explain kriye
What is orthogonal
two signals are orthogonal if the inner product between them is 0 or angle is 90 degree..
Thanks for connecting
I literally wasted 11 mins just to know all terminology but not working 😂
Nicely explained ! Thank you
Thanks for your feedback and thanks for connecting
Looks cute in that band and dress🔥
hi you are so beautiful
Through the entire vdo i can only see your long hair honestly speaking mam i know you have a long hair but i think this is not the right place to show it of because of it our attention is got distracted.... a true suggestion from my end that please make vdo clean and clear 1st students focus should only the blackboard. thanks
This is true... I see this video because of the attraction... Sahi pakde
@@yasarvhora3530 😂😂😂🔥
If she was your mom ,still u get distracted?? It's all about mind bro
@@pseudocodex Point
That seems like a you problem. She's fine. I can't imagine how you'd be a good worker if you get distracted so easily.
mam bahut bada hai.............................video
shit
Why?