Understanding APSK and QAM

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This video provides an introduction to the basic concepts of amplitude and phase shift keying (APSK) and quadrature amplitude modulation (QAM).

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This is one of the best explanations out there! Thank you!

KrampflOtto

Thanks for the explanations guys, I´ll give it good use. Rohde Schwarz you earned my appreciation.

darktemplari

Kudos to you on a great presentation. You basically covered the essence of Digital communications subject in my undergrad school. Please keep it coming. Thank you.

pradeep

Rohde & Schwarz provides better education than my university lol, my classes were like explaining the turbo encabulator now it is so much clearer ++ Thanks

Nonchalant

Thank you for the understandable and compact wrap up of the topic! Also the comparison between (A)PSK and QAM really helped me to better understand the topic. Cheers.

joe_ey

Simple and straightforward in general terms.
Thank.

arenaengineering

Thanks for this great explanation of the basics, very helpful.
Regards from Hannover/Germany, Danke.

HelmutTschemernjak

This kind of explanation is required for proper understating of the concept . Thanks for such great explanation.

balamuralikrishna

I work with QAM equipment. Repairing, tuning, and bench testing. Watching the constellation during testing is cool to see live. This technology goes back decades but is still widely used today for cable internet. For sending large amounts of data through copper, this is primary. Fiber is superior, but even that is converted to QAM for coax. ATX, Broadband International, Scientific Atlanta and Arris still manufacture QAM amplifiers. In the beginning, the bandwidth ranged 54-330mhz, then to 450(i think), 550, 750, 860/870, 1, 000, and now we're at 1.2hgz. GHZ doesn't play nice with coax over long runs, so eventually to keep up with data rate demands, either the modulation will change, coax will change, or everything goes to fiber. Great presentation!

yzftony

Very clear and informative. Thanks.
Would love to hear more about the Crest factor (PAPR).

CliveReyes

Thanks a lot. This video has saved me much time.

zonglehuang

Very clear and precise explaination. Thx

dirkl

it was so informative, thank you alot, what is the name of the playlist than contain this video ?

kozhenidres

Thanks for the video - What does it mean when there are two extra symbols on a 64QAM measurement? I've noticed there are two symbols with 0 and 180 degree phase on every 802.11g measurement I do.

JonaTheLegend