LightSquared’s revised rollout plans in the lower part of its...
LightSquared’s revised rollout plans in the lower part of its L-band spectrum requires additional testing, Clearwire said in FCC docket 11-109 (http://xrl.us/bkz6m2). The filing included a report on the impact on Clearwire’s commercial system in Las Vegas while LightSquared was…
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performing “live sky” testing there. Clearwire’s testing wasn’t part of the official technical working group testing on LightSquared’s interference issues with GPS signals. Even with lower power levels and initial use in just the lower L-band, the new plans need more testing, Clearwire said. “Preliminary tests show a strong probability of interference from the lower band for several classes of devices, especially if the power reduction is accompanied by greater cell density.” The testing of LightSquared’s original plan “demonstrated conclusively” that significant GPS interference would result and require replacement of GPS antenna across its nationwide network, said Clearwire. LightSquared has said it’s unwilling to pay for GPS interference mitigation, a position that is at odds with mobile satellite service/ancillary terrestrial component rules, said the filing. “To determine the true degree of GPS interference or whether mitigation measures will be adequate, it will be necessary to have an interference test which reflects real-world deployment conditions before it can be determined whether co-existence with GPS is possible in the upper or lower band of LightSquared’s spectrum."