Understanding RF Fundamentals and the Radio Design of Networks

[@bdm1019]

Thank you for the presentation. This is exactly what I needed. Something simple to understand.

[@graysonfernando8272]

flixportal :P

[@moderntechsalescom]

This is terrific. Thank you for sharing, Fred. Very informative.

[@MrKaavian]

thanks for the lecture and it is very helpful for me to understand about RF and radio desgin,,,,,

[@davidmcdonough7693]

Really Informative :)

[@sri48k]

this a very good session on RF , thank you for this session

[@WickedTwitches]

This is a good presentation marred by random phone blips and barely audible content.

[@jaimeocanada]

How can I get a copy of the presentation?

[@Moronvideos1940]

The audio level is too low and filled with AC Hum ..... please fix it .....

[@vlbvinoth]

very nice.....:-) i really welcome these like lectures.thanks a lot....plz...do post more....:::-))))

[@j7ndominica051]

I still don't understand MIMO well. If it simulates something like a software steerable phased array with multiple elements, with the outcome is that the signal strength is increased by a 3 dBs or so per antenna, which is good if it works without aligning the individual antennas. So we would get at most the same throughput to a distant station that we get to a close one. But is it really possible to transmit and decode different data streams within the same spectrum? That doesn't make sense.

[@whitneydavis124]

j7ndominica0 MIMO typically uses OFDM. I encourage you to Wikipedia or Google OFDM for a better description. Through the OFDM process, different frequency channels (data streams) are multiplexed together and then encoded through an N-point IFFT. The output of the N-point IFFT is converted to an analog signal and is used to modulate the carrier frequency. With MIMO, the modulated carrier frequency is transmitted by multiple transmitters but with different phase for each transmitter. This way, when the signals interfere with each other, they constructively interfere providing the receiver with a stronger, directed signal. At the receiving end, the signal is demodulated, converted back to a digital signal, and undergoes an N-point FFT. Then the different frequency channels (data streams) are demultiplexed and each individual channel is decoded based on the modulation scheme used by each channel.

[@mdesm2005]

what's the take away?

[@WiFivomFranMan]

Good Job Fred

[@lorilianemacoycruz5383]

submarine coms use the kHz band approx. 30 kHz or so

[@miizarebel]

Nice lecture.

[@slasheagles]

Thank you..The video was very informative..

[@greatsea]

0:48

[@greatsea]

"the take away is . . . "

[@tomp2008]

1:08:40 that's adorable

[@israeladamu6934]

Wonderful

[@blumj1]

Frequent electronic "Beeping" in the background during this video was annoying

[@stevenmcabee9301]

+Jim Blum Those are people joining and leaving the conference call

[@kencheng2929]

Steven McAbee still annoying

[@ABBJBB]

Wow

[@scottwhittle6319]

Nice, but teach your guys not to cough, ditch the conf-join/leave beeps, and for gods sake get a real microphone and encode above a 300bps rate! Production matters