epsolutions
- Sep 7, 2019
- 116
- Joined
- Sep 7, 2019
- Messages
- 116
Can anyone provide an oscilloscope screenshot, or plotted output, that clearly shows several cycles of the 10Hz beacon as embedded within a Wi-Fi transmission?
Can anyone provide an oscilloscope screenshot, or plotted output, that clearly shows several cycles of the 10Hz beacon as embedded within a Wi-Fi transmission?
................My oscilloscope will not read that high. Can anyone please help?
Sorry. You've lost me there. I am interested in a screenshot of the actual Wi-Fi signal not a plot of its frequency spectrum.
That is your interpretation, but it is incorrect. This image shows a veeeery symbolic representation of the signalling and the beacons are higher only to accomodate the text.implies a difference in amplitude.
I am sure we have "lost" you since you seem to have absolutely no idea what "the actual Wi-Fi signal" is. Why don't you get up to speed on modern communications theory and modulation methods before wasting our time here in this forum? Here is a Wi-Fi Primer (a beginners text) from Texas Instruments to get you started. You have already linked to this document in your post #9 but now would be a good time to read and understand the entire document before trying to, for example, interpret graphs therein out of context. Read ALL of the Primer! Don't just cherry-pick things you have no understanding about and bring them up here for our consideration. Those are things are for your consideration, but we are more than willing to discuss them with you after you have demonstrated some rudiments of understanding and self-education, You definitely need more than an oscilloscope and a spectrum analyzer (although those will help further down the road) to receive and interpret a Wi-Fi signal. Howsabout telling us what access point you are going to use and what its protocol is? Also, it would help if you would tell us what you are going to do with the beacon signal after you have found it, and how you think this will help you to understand Wi-FI signal structure. Of course, if if you have found the beacon signal, that pretty much says you now understand Wi-Fi signal structure... so good luck with that!Sorry. You've lost me there. I am interested in a screenshot of the actual Wi-Fi signal not a plot of its frequency spectrum.
Looks like your education is coming along nicely. The Beacon is just one indication that a rabbit-hole exists. Now you must buy (or build) hardware that will inspect ALL the packets streaming through your Access Point and decide what to do with them. This is essentially what a firewall does.I have no practical application for this. I simply wanted to know, in general terms, how the beacon was integrated into the Wi-Fi physical layer. I thought a screenshot image might help. I would have liked to find one online, but could not.
If I understand correctly, the beacon is a Wi-Fi frame of fixed shorter duration that recurs once every 100mS, preceded by an inter-frame space (PIFS).
It helped to be advised here of the correct terminology so I could continue researching this online.
https://www.rfwireless-world.com/Terminology/WLAN-SIFS-vs-PIFS-vs-DIFS-vs-EIFS-vs-AIFS.html
https://www.researchgate.net/profil...censed-spectrum.pdf?origin=publication_detail