4 ms·
"This way our machines will have to be shut down with aeroplanes in order to shut down the system [...] with modern radio transmitters we can get over 100Mbps p
by objclxt 15y ago
"This way our machines will have to be shut down with aeroplanes in order to shut down the system [...] with modern radio transmitters we can get over 100Mbps per node up to 50km away"
...or just jam the signal, surely? If you were that serious about it...
- 4ad 15y agoIt would be very difficult to jam a CDMA signal.
- tedunangst 15y agoBecause it's frequency hopping? I'm not an expert, but I thought that was only hard with a single antenna. If you can broadcast noise on all the channels, it's still jammable. No?
- troygoode 15y agoYou would then be jamming all cellular activity, which presumably wouldn't fly (no pun intended).
- Nrsolis 15y agoTo suggest that jamming a CDMA signal is impossible is BEYOND ignorant. It is trivially easy to jam a CDMA signal. Hell, when Qualcomm was trying to get CDMA off the ground, they used to do it to themselves ALL THE TIME. For the interested, just Google IS-95A for Crtl-F for Walsh code. Mix one part clock sync'ed publicly known Walsh Code with one part bit randomness. Stir gently and enjoy.
- nowarninglabel 15y agoExcept that no one suggested it was impossible...which leaves one to wonder why you are using ad hominem against an argument that was never made.
- todd3834 15y agoI believe you meant Straw Man fallacy https://en.wikipedia.org/wiki/Straw_man https://en.wikipedia.org/wiki/Straw_man
- furyofantares 15y agoThat's not ad hominem, it's just an insult. But you are right that he's attacking an argument that nobody made.
- Nrsolis 15y agoMy apologies. What I meant to say is that jamming a CDMA signal is TRIVIALLY easy. It's been done, it doesn't require a lot of equipment, and it's very very effective. There have been MULTIPLE attacks against supposedly jam-proof wireless systems that not only showed that they we not only jammable, but that the mechanism designed to make them jam proof only made it easier. In particular, the control channels that manage access to the air interface are notoriously vulnerable to disruption. So my beef is that the idea that a spread spectrum system is somehow more resistant to jamming is just plain wrong.
- kitsune_ 15y agoActually, it's rather 'easy' to jam DSSS/CDMA signals - Especially for nation states. There are a variety of techniques and tools that can be used.
- brown9-2 15y agoOr prevent the drones from refueling.