The Federal Communications Commission (FCC) has modified the rules for measuring emissions and power limits for broadband Personal Communications Services (PCS) and Advanced Wireless Services (AWS).
Specifically, the Commission will now allow the use of a power spectral density (PSD) model in the evaluation of PCS and AWS devices. In the PSD model, radiated power levels are measured in terms of watts-per-megahertz when operating with greater than one megahertz of bandwidth. Formerly, FCC rules measured radiated power in terms of watts per emission, and limited power output regardless of bandwidth size.
The Commission says that the switch to the PSD model is more “technologically neutral” in accommodating broadband technologies, and has the potential to reduce network infrastructure costs, thereby making it more economical for providers to deploy advanced wireless broadband services in rural areas.
Further, under the new rules, power levels can now be measured using average values, instead of peak values, with a peak-to-average ratio limit of 13 dB. The Commission says that this approach is a more practical way of measuring power levels, and will better accommodate technologies that produce emissions with sub-microsecond power spikes.
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