How is LTE on the 700MHz spectrum “doomed to fail?” Verizon Wireless has introduced it in over 100 cities. Now, it’s clear they are taking a more cautious approach to their deployment - Buffalo, for example, has not been activated due to interference from analog TV channels from Canada.
Thus, while I agree with (probably) all three of your points, I don’t agree with your conclusion, that it’s a plan doomed to fail.
They really aren’t the same thing.
A TV signal isn’t weak compared to a GPS satellite signal. It’s an apples and oranges argument you’re making (If I understand it correctly..) Further, TV’s do have some level of filtering, though as an amateur radio operator, i would argue even that isn’t sufficient.
What is going on here is that they are putting KW transmitters within Mhz of what was always intended to be a quiet zone spectrally speaking. There is no front-end protection against adjacent signals within GPS receivers. Lightsquared is bitching about that - but they weren’t required to put that front-end rejection in because of the service it is operating in, i.e. a satellite service with the expectation of no strong near neighbours.