3 ms·
Isn't your math off? Due to path loss, rx signal is 1e-10mW => -100dBm, not -10dBm. Plug into the formula and we have a maximum theoretical bound of ~ 0.14 bi
by amscanne 12y ago
Isn't your math off?
Due to path loss, rx signal is 1e-10mW => -100dBm, not -10dBm.
Plug into the formula and we have a maximum theoretical bound of ~ 0.14 bits/second, or one byte every 42 seconds.
- bryanlarsen 12y agoEven 1 byte every 42 seconds would be very useful for many types of sensors.
- amscanne 12y agoThat's with the transmitter on 100% of the time.
- jrockway 12y agoI switched from W to dBm at the last minute, so there might be mistakes. Anyway, I think it ends up being feasible, because you have some play with transmit power, the noise floor, reflections, and a better antenna, which will all change your number by a few 10s of dB in whatever direction you choose. Definitely not the worst startup I've seen on HN. I think they can make something useful, since their goal is quite modest.