3 ms·
hmmm, not with 100mw, in the old days of CMDA perhaps if the phone had 600mw which some did back then. But Loon is using LTE as I understand it, and I think it
by zw123456 12y ago
hmmm, not with 100mw, in the old days of CMDA perhaps if the phone had 600mw which some did back then. But Loon is using LTE as I understand it, and I think it said they are using unlicensed spectrum, which, although I have not seen it spelled out, I am guessing in the 5.8Ghz band but even at 2.4Ghz, you are not going 50 miles on 100mw especially not since LTE is not CMDA, in the downlink LTE is OFDMA and in the uplink SC-FDMA, both of which have a much larger Peak to average ratio than spread spectrum so unless you are using an extremely narrow beam antenna (hard to aim while moving), that signal will probably be below the receiver sensitivity).
- hengheng 12y agoI could imagine more TX power on the balloon (nobody's in the way so it shouldn't do damage), as well as more sensitive RX antennae, since there isn't the same size or weight restriction as on an airplane or a satellite. Come to think of it, an unmanned balloon is actually the wet dream from an antenna standpoint.
- zw123456 12y agoYup. The downlink is always easy (from the tower to the phone). The uplink is always the weakest link because the size of the device, the limited battery the limited size of the antenna due to the form factor of the phone and so on. If it was strictly a broadcast solution it would be a lot easier, but even if you are streaming youtube, you still need the uplink for TCP and so on.