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Thanks Franny, Rob, Digikey, Et. tel.

Iron

Not currently on a project

Iron

thanks for this great course

Great lecture, but regarding diversity, on wireless routers and repeaters, would it be wise to arrange the wireless repeater on a different level? 

Iron

thank you all for attending! I look forward to speaking with you tomorrow.

Blogger

Thanks Fran a lot to digest.

Iron

@WherleyBird The number prefixing QAM referes to the number of points on the constalation diagram, which inturn allows for more data to be represented.

QAM16 has a constalation diagram that's 4x4, QAM 64 has 8x8 etc. See http://en.wikipedia.org/wiki/File:QAM16_Demonstration.gif for an example

 

Iron

thank you for a good info/ideas

Iron

subcarriers are decoded in DSP.  the mixing stage is a single stage for each MIMO radio, but then the baseband demodulator will extract the subcarriers from a sigle analog signal that reaches it via A/D converters

Blogger

In the Rx decode of resource elements, is each element a physically separate decoder or is all the information from the 12 subcarriers handled by 1 H/W element, the rest being S/W?  Wow!

Iron

and then you would have multiple streams and quasi-omni coverage

Blogger

of course if you have a high order base station, say with 8 MIMO radios, you may be able to form multiple focused beams simultaneously

Blogger

right - we wouldn't have omni coverage with beamforming, but a stronger focused signal

Blogger

but you would sacrifice coverage for snr, using beamforming, correct?

Iron

Beamforming technique can be used for multiple or for a single stream

Blogger

? what's the number preceding QAM represent? I noticed for every 4 fold QAM increase there's 2 bits more bits per symbol.

TX diversity typically sends only one stream -yes

Blogger

beamforming typically focuses the enerty of the TX in one direction to extend the range or to improve reception. it can also be used for spatial multiplexing (i.e. for an AP or a base staiton to communcate with multiple end user devices simultaneously)  

 

TX diversity typically tries to send the signal in two slightly diferent ways so that at least one of them can be received (e.g. frequency offset, phase offset, etc.)

Blogger

what's the main difference between tx diversity and beamforming? is it because beamforming usesmultiple streams of data whereas tx div uses only one stream?

Iron

Thanks for the anwer.  

Iron

256 QAM transmits 8 bts per symbol

Blogger

I just looked up QAM, Quatrature Amplitude Modulation.  Wow.  Talk about a clever and tricky scheme.  You can get 4 bits in a single carrier pulse.  I assume the higher number QAMs are more sophisticated versions of the same?

Iron

Thanks, that filled in alot of the holes in my knowledge.

 

Iron

Thanks Fanny, for a great program. 

Tune in tomorrow for Fanny's next presentation, 

Blogger

MIMO AP can enhance the link throughput and range for a traditional SISO device by using TX diversity, for example

Blogger

Is it redundant to use a wifi device (with one receiving antenna) and use a MIMO access point/antenna to communicate?

Iron

MIMO systems benefit from the multi-core processor architecture?

Iron

thank you fanny, rob, digikey and ieee

Thank you, Fanny. I do appreciate the technical detail, even if it means I may need to go over this material more to really get a handle on it.

Iron

thank you for a good info and plesant chat

Iron

yes - QAM is inverse fourier transformed from frequency to time domain - processors in baseband can be custom ASICs but for the MAC layer these may be standard CPUs

Blogger

Fanny, It seems like these signals would have to be buffered to enable further processing.  For example QAM would be doing some Fourier Transforms.  What kinds of memory and processors are typically used in these radios?  Embedded designs like PSoC, etc.?

Platinum

regarding introductory books, I would recommend some of the IEEE 802.11 books - sorry i don't remember off the top of my head

you might also check my previous lectures and you can find links to them here: http://www.octoscope.com/English/Resources/Webinars.html

Blogger

What is the relationship between these technologies and the "Software defined radio" concept?

Iron

Looking forward to tomorrow's session.

Iron

Thanks Fanny great talk!

Iron

Thank you, very informative!

Iron

Thanks.  I liked how in depth this was.  Extra length is not a problem. Prefer the details.

Iron

Thank you.  Very interesting, but like drinking from a fire hose.

Iron

Thank you Fanny.  I have not yet worked with a lot of the technology that was discussed and I was wondering if you could recommend some introductory books to the subject matter that we will be covering this week?

Iron

Excellent Lecture. Thank you Fanny.

Iron

Indeed an update... thak you Fanny!

Thank you all at DNR & octoscope

Iron

Thank you for the excellent presentation!

Thank you Fanny & Digi-Key

 

Iron

Thanks Fanny & Rob.

Iron

Thank you Fanny and Rob

Iron

Thank you! Are you going to talk about MU-MIMO in the upcoming lectures?

Iron

Thanks. I like your indepth knowledge of the subject.

Iron

Learnt new things. Thank you Fanny!

Iron

Very good presentation, Thank you

Thanks Fanny and Rob.

Iron

Thank you Fanny, Design News, and Digi-Key

Platinum

Fanny - a lot of information to digest - thanks for the presentation

Iron

Thank you for the presentation, very good and insightful.  And yes, very cool & Detailed chart.

Iron

Thank you Fanny! Thank's Digi-Key!

Iron

thanks ... looking forward to tomorrow

Iron

Thanks from Tucson! Great Job.

Iron

thanks for the great lecture.

Iron

I had no idea that things have gotten so complex.  Amazing.  Thanks.

Iron

thanks Fanny and Rob, it's a great class.

Iron

wow that's a cool chart. Need a really big printer.

We're now on slide 28.

Blogger

We're now on slide 27.

Blogger

We're now on slide 26.

Blogger

We're now on slide 25.


 

Blogger

We're now on slide 24.

 

Blogger

We're now on slide 23.

 

Blogger

We're now on slide 22.

Blogger

This boggles my mind.  ;>)

Iron

We're now on slide 21.

Blogger

We're now on slide 20.

Blogger

We're now on slide 19.

Blogger

We're now n slide 18.

Blogger

We're now on slide 17.

Blogger

We're now on slide 16.

Blogger

We're now on slide 15.

Blogger

Is compression used.  Do you use antena in beamforming or software?

Iron

We're now on slide 14.

Blogger

qam quadrature amplitude modulation

Iron

We use Mimo with Spatial Multiplexing

What does QAM stand for?

Iron

using 3rd party 802.11n 3x3 bridges as prebuilt blocks

Iron

I am not working on it.

Iron

On Wi-Fi networks using spatial multiplexing.  AP's are transmitting on up to 2 antennas and 3 antennas receiving supporting 2 data streams.

Iron

Yes, using MIMO on our designs 3X & 4X

Iron

some wifi equipment does some sort of mimo (less so in the embedded space); relatively sure none of the other technologies I'm using are

Iron

fan's? not at this time. beamforming- phased array ants?

no MIMO technology yet.

Iron

Not into designing radios just repairing them

Iron

Yes, But I'm not sure what mode is utilized

Iron

considering wifi or bt

Iron

Limited MINO impl.

 

Iron

not currently using MIMO at this at this time

Iron

Yes, spatial multiplexing

 

Iron

Yes. 3X3 MIMO with spatial multiplexing and beamforming.

Iron

Using MIMO -- not designing

Iron

Have not done any work in this area yet

Platinum

Have not used MIMO technology.

Iron

We're now on slide 13.

Blogger

 

no mimo as yet

 

Iron

I think so, but not sure.

No, but sound interesting

Iron

Not working with this at all yet.

Iron

Fanny's question:

Are you using MIMO technology in your design?  If yes, what MIMO modes does it support?

Blogger

 

audio is consistent and good quality

I had to turn up the volume at the start 

 

Iron

as for which modulation, bits per symbol, etc, -- I don't work at such a low level with any of these radio technologies ATM 

Iron

Not working with at this time

Iron

We're now on slide 12.

Blogger

If audio is poor, try refreshing your browser, or try a different browser.

Blogger

The audio is fine for me

Iron

I don't use low level with radio yet, but estimating what's better

Iron

None at the moment

Iron

Your audio is very poor.

 

Iron

don't work with this at the moment

 

Iron

I work with radios -- suuplied by Atmel and TI for sensor data.

Iron

I don't work with radios at the moment.

MCS7 - 64-QAM on our 2x3 Access Points

 

Iron

We're now on slide 11.

Blogger

 

CP is defined on slide 8, cyclic prefix

 

Iron

fan's? none again at this time, would look for qam, have used FSK.

not currently designing any radios; currently working with multiple mixers in some HW

Iron

We're now on slide 10,.

Blogger

I do some work with various 802.15.4 systems, wifi, bt, considering btle, and some assorted proprietary (haven't really worked on such a low level; but been conscious [out of curiosity] of various mainstream (eg 2g, 3g) scheduling schemes)

Iron

QPSK through to QAM 256, option of fixed or adaptable.

Iron

BPSK to 64 QAM adaptable

Iron

slide 4 does not have all the acronyms (e.g. CP)

Iron

Fanny's question:

What modulation does your radio use?  How many bits per symbol is it able to transmit?  Does it use adaptable modulation?

Blogger

@WherelyBird - see slide 4 for the acronyms.

Iron

long term evolution

Iron

We're now on slide 9.

Blogger

We're now on slide 8.

Blogger

A little with TDMA, some Slotted ALOHA.

 

Iron

I am trying to get familiar with WiFi and CSMA/CA.

Iron

Most of this is totally new to me at this level of presentation.

Iron

Years ago I had a box using TDMA for 8 RS-232 line - pretty high tech for the time.

 

Iron

We use all but I'm most familiar with Wi-Fi.

 

Iron

none at this time. Still learning

Iron

ZigBee & ISM Proprietary (TDMA - CSMA/CD/CA, FDMA)

choppy audio; never had this problem before with these coureses

Iron

Limited exposure time mux

Iron

I know about these technologies but would have a hard time explaining without crib notes.

Platinum

not familiar with any other FDMA

Iron

none in particular, hoping to understand the concepts and terminology

 

Iron

just TDMA at present

 

Iron

fan's? none at this time

still learning with focus on WIFI

Iron

Familiar with TDMA, CSMA/CA. FDMA.

Iron

Content blocked by my organization!

Iron

Heared of but not familiar with

Iron

Fanny's question:

Do you work with wireless technologies? If yes what kind?  What access scheduling scheme are you are working with?  For example, 2G and 3G technologies, like GSM and WCDMA, use Time division multiple access (TDMA) (time slots) for access.  Wi-Fi uses CSMA/CA (carrier sense multiple access with collision avoidance).  Other services might use FDMA (frequency division multiple access).

Blogger

We're now on slide 7.

Blogger

Late arrival from SC

Iron

Slide 6 would look pretty good with one signal line of sight making three paths.

Iron

I did the same.  Listening on the iPad on the guest network.

Iron

@rapid17, one place I worked blocked audio, but I was able to use the guest network for video & audio that were work related.

Iron

firefox works great for these

Iron

We're now on slide 6.

Blogger

@rapid17, is your network administrator blocking live audio?  Are you able to listen from home or listen to the archived classes?

Platinum

not very familiar with baseband algorithms

Iron

little knownings - some base theory

Iron

Sound vanished my computer, is a general issue?

 

Iron

I've tried everything. I just have to remember the stuff from Design News doesn't work so I don't waste effort signing up in the future.

Iron

not familiar with base band

Iron

We're now on slide 5.

Blogger

mostly familiar just with theory (from school); still learning. Interacted with ZigBee and BlueTooth, have built some basic rf circuits in the past

Iron

I am not familiar with base band tech

Iron

I am not familiar  with these technologies.

Iron

Not familiar with base band

Platinum

fan's? none at this time

Fanny's question:

Are you familiar with baseband technologies and algorithms?  If yes, please elaborate.

Blogger

Not familiar with base band

Iron

We're now on sldie 4.

Blogger

ZigBee, 802.11, BT for me

Iron

Neither yet.  Still learning.

Iron

I'm trying to get up to speed on the latest.  No wireless project right now.

Iron

Currently propritary, but may move to LTE

 

Iron

802.15.4 - But interested in emerging communication technologies and protocols.

Iron

Fannys? none at this time

i am working with 802.11

Iron

studying super wi-fi

Iron

Primarily wifi and bluetooth.

Iron

None noe have used N

 

Iron

Same problem on Firefox. Just "Block talk radio", a couple of words and then silence. Yes, I tried the volume control.

Iron

I'm working with 802.11 as applied to industrial automation control

Iron

I'm currently working on 802.11n/ac radios

Iron

Mainly a user of WiFi and LTE.

 

working primarily with 802.11

Iron

We're now on slide 3.

Blogger

Fanny's question:

What is the wireless technology you are working with?  2G/3G/LTE?  802.11? 

Blogger

@rapid17, some say Chrome or Firefox works better than IE. 

@fjglan, did you turn up the volume control at right of the elapsed time on the audio bar?

Platinum

Hellow From Santa Cruz,CA

Iron

We're now on slide 2.

Blogger

Hello from cold and snowy SE Lake SImcoe Ontario Canada. The palm trees are freezing today.

Iron

Hello for Rochester, NY

 

Iron

Sound seems too low, can you raise?

Iron

The adobe thing just came up. Same as the other weeks. It just says "block talk radio and then one line from the lecture and then nothing. Why can't they get this fixed. Another wasted attempt....

 

Iron

@rapid17 The audio bar is below the class title.  Refresh your browser if you don't see it.  Also download Today's Slide Deck for the power point slides.

Platinum

Hi from the fridgid cold.

Iron

Saludos from Spain, Valladolid in Europe

 

Iron

Howdy from Everett, WA.  Where's the link to the lecture?

 

Iron

hello everybody, Indiana - below zero and getting colder

Iron

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

 

audio is live

 

Iron

Good morning from CA

Iron

Hello from MN.  Minus 9 degrees F right now.

Iron

Good Afternoon from Nebraska

Silver

Hello from southwest Ohio

Iron

how to get the link to have webex? Thanks.

Iron

Good morning from Reno, Nevada.

Iron

Good afternoon from the frigid midwest

Iron

Hi from Christchurch, New Zealand

Iron

Good afternoon,from Montreal

 

Iron

Good morning from the West coast.

Iron

Hello from Hudsons Hope BC

Iron

-You are eligible to earn IEEE Professional Development Hours by attending these courses and participating in the chat function. Additionally, we are no longer using the points system, offering "graduation", or giving grades. The IEEE hours are taking the place of that. There are some important things for you to know about earning the hours. The most important ones are that you need to attend these courses live, you need to attend a minimum of two of them per semester, you need to fill out a course evaluation form within 2 weeks of the end of the class, you need to attend 4 out of the 5 classes per course, and you need to participate in the chat function every day you attend. Please click on the link at the top of this page that says "How do I earn IEEE professional development hours" to read all of these important details and more.

Blogger

Hello from mexicali, mexico

 

Iron

Greetings from Bucharest (Romania):-)!

starts in about 8 mins.

Iron

Hello from SW Michigan

Iron

 

We still have 8 minutes to start

 

 

Iron

The slides are the best so far

Iron

Are we about to start?

Iron

The slides detail what the acronyms mean.  Very helpful.

Iron

It's stil above zero in all of Alaska

Iron

Heat wave in NE Pennsylvania - 23°F

Iron

 

hello from sunny 10F Mishawaka

 

Iron

-The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. If that doesn't work, the class will be archived immediately following our live taping.

Blogger

Hello from El Paso, TX

Iron

Hello from frozen Minnetonka, MN.

Iron

Looking for a great lecture from great speaker.

Iron

Hello from Chicago

Iron

Hello from Summerville, SC. How is everyone doing?

Iron

-Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

Hi from Albuquerque, New Mexico.

Blogger

Hi from Panama City, FL.

Iron

Hello from Montana. If you took Fred Eady's class, don't forget to take the class survey. Last day!

Platinum

-Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using #DigiKeyCEC.

Blogger

Hi Fanny, Rob, and all others

Iron

-You are eligible to earn IEEE Professional Development Hours by attending these courses and participating in the chat function. Additionally, we are no longer using the points system, offering "graduation", or giving grades. The IEEE hours are taking the place of that. There are some important things for you to know about earning the hours. The most important ones are that you need to attend these courses live, you need to attend a minimum of two of them per semester, you need to fill out a course evaluation form within 2 weeks of the end of the class, you need to attend 4 out of the 5 classes per course, and you need to participate in the chat function every day you attend. Please click on the link at the top of this page that says "How do I earn IEEE professional development hours" to read all of these important details and more.

Blogger

-Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger


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