3 ms·
I don't think they use OOK aka PAM2. I expect something like baseband OFDM fed to the AM-only-capable LED. Nicely isolates narrow band noise. Then usual high
by namibj 3y ago
I don't think they use OOK aka PAM2.
I expect something like baseband OFDM fed to the AM-only-capable LED.
Nicely isolates narrow band noise.
Then usual high order QAM in the subcarriers.
256QAM gives you 8bit per symbol.
So it'd only require 125MHz of modulation bandwidth...
- dragontamer 3y agoYou mean 1.2Ghz of modulation bandwidth to reach 9.6Gbps with 256QAM. Is that a 400ps rise + 400ps fall time LED? Picoseconds? Or the use of like 8192QAM or something incredible?
- namibj 3y agoI don't know, I was pointing out for the data rate that seems to be part of some COTS devices, not the data rate that you can negotiate with research lab hardware.