3 ms·
Even in small areas we have CSMA (listen before talk) collisions in 2.4/5G bands that create high latency variance [1]. You can only have one transmitter per ch
by cyounkins 7y ago
Even in small areas we have CSMA (listen before talk) collisions in 2.4/5G bands that create high latency variance [1]. You can only have one transmitter per channel.
With Starlink there will be many ground-based transmitters that can't do CSMA (because they are directional). How many channels are available could depend on the dedicated bandwidth, but I have a hard time believing we won't see significant transmit collision issues.
[1] https://blog.parsecgaming.com/how-your-wifi-band-impacts-low-latency-connections-9f1e538a63dd https://blog.parsecgaming.com/how-your-wifi-band-impacts-low...
- wmf 7y agoCSMA is basically the worst MAC protocol. When performance matters you use TDMA.
- wahern 7y agoStarlink will use something like OFDM. See https://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing#Space_diversity https://en.wikipedia.org/wiki/Orthogonal_frequency-division_... From the famous IEEE article at https://spectrum.ieee.org/telecom/wireless/the-end-of-spectrum-scarcity https://spectrum.ieee.org/telecom/wireless/the-end-of-spectr...: > Moreover, interference is not some inherent property of spectrum. It's a property of devices. A better receiver will pick up a transmission where an earlier one heard only static. Whether a new radio system "interferes" with existing ones is entirely dependent on the equipment involved. Consequently, the extent to which there appears to be a spectrum shortage largely depends not on how many frequencies are available but on the technologies that can be deployed. Many regulations intended to promote harmony of the airwaves have instead, by putting artificial limits on technology, created massive inefficiency in spectrum utilization.