Time splitting is just lazy frequency hopping, change my mind
Comment on Recognize the mother of Wifi
henfredemars@infosec.pub 5 months ago
Note that this frequency hopping is no longer used in most WiFi networks today. It is, however, critical to classic Bluetooth, and BLE still somewhat uses it. I have no idea how it’s related to GPS.
theneverfox@pawb.social 5 months ago
henfredemars@infosec.pub 5 months ago
Can two devices transmit at exactly the same time with time splitting?
theneverfox@pawb.social 5 months ago
From a human perspective, yes, that’s exactly what it does
If you want to get pedantic about the technical details, it’s not time splitting if you’re not splitting the time…
henfredemars@infosec.pub 5 months ago
Technically speaking, isn’t differentiating between any two things pedantic? For example the moon, and chocolate, both are things. If you don’t want to get pedantic about it.
Socsa@sh.itjust.works 5 months ago
Frequency hopping in wifi was never well supported. 802.11a was primarily DSSS and afaik, very few, if any consumer devices supported the FHSS mode.
henfredemars@infosec.pub 5 months ago
Indeed. Just speaking from a signals point of view, frequency hopping is not competitive for high bandwidth applications. It is however surprisingly durable in the presence of interference despite its simplicity. We’re seeing this play out in newer Bluetooth standards.
maynarkh@feddit.nl 5 months ago
Isn’t it still extensively used for RC stuff like drones and model aeroplanes / cars though? Asking as an amateur.
Warl0k3@lemmy.world 5 months ago
It very much is! It’s widely touted as a safety feature, since interference on one frequency means you wont lose control of the flying blender for more than a few milliseconds (well, usually…)
henfredemars@infosec.pub 5 months ago
Yes. It works well because this is an application that requires low bandwidth, and interference could cause you to lose control and is even expected with multiple operators in the vicinity. You definitely want to have resilience to other interfering signals.