LightSquared cannot coexist with GPS: official report

Nine federal agencies examining the potential interference to GPS receivers from LightSquared´s network insist the system can not coexist with GPS operations.
“Based on testing and analysis, there appear to be no practical solutions or mitigations that would permit the LightSquared broadband service, as proposed, to operate in the next few months or years without significantly interfering with GPS,” said Deputy Secretary of Defence, Ashton Carter, and Deputy Secretary of Transportation, John Porcari, in a 13 January letter to the National Telecommunications and Information Administration (NTIA), part of the Commerce Department.
Carter and Porcari were speaking for the nine federal departments or agencies that make up the National space-based positioning, navigation and timing (PNT) executive committees (EXCOM).
The study was requested by the NTIA and the US Federal Communication Commission (FCC), which gave LightSquared a conditional approval to launch the new network pending proof that it could co-exist with GPS.
The group said that while it supports the Obama administration´s 28 June 2010 request to start assigning a total of 500MHz of spectrum for broadband, that GPS must be protected.
“We propose to draft new GPS spectrum interference standards that will help inform future proposals for non-space, commercial uses in the bands adjacent to the GPS signals and ensure that any such proposals are implemented without affecting existing and evolving uses of space-based PNT services vital to economic, public safety, scientific and national security needs,” said EXCOM.
LightSquared Letter