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I am curious about the overhead on a packet network for erasure codes. I am guessing they're easier to use on a channel oriented network where a small number of
by benlivengood 6y ago
I am curious about the overhead on a packet network for erasure codes. I am guessing they're easier to use on a channel oriented network where a small number of senders and receivers are protecting a multiplexed packet stream. Additionally I'm guessing the most effective use would be 2D encodings like optical media use to spread the codes out over time (for runs of bit errors) and space (single bit errors) which would introduce another latency/efficiency tradeoff.
- londons_explore 6y agoIf you have bursty bit errors on a link, erasure codes can correct them without a round trip while not adding latency in the case where a burst of errors didn't occur. Having said that, I don't think this situation will apply to spacex. They probably won't get random bursts of errors. Noise levels will be very deterministic and can be calculated ahead of time by looking at what stars are "behind" the satellite.