‘First Ingredient’ of ATSC 3.0's Physical Layer Gets Elevated to ‘Candidate Standard’

Roughly a week before ATSC 3.0's framers unleash a full progress report on the next-gen DTV standard at their “Boot Camp” conference on Wednesday in Washington, ATSC Thursday said the “first ingredient” of ATSC 3.0's physical layer has reached the status of “candidate standard” following a month of balloting. The so-called “bootstrap signal” portion of the physical layer is designated “A/321 Part 1" and will be “important to the future evolution of ATSC 3.0,” ATSC said in an announcement. Other “core elements” of the physical layer, including its modulation and error correction systems, will be balloted for candidate status this summer, ATSC said. Balloting on each of ATSC 3.0's components typically will be a four-week process, ATSC has said. The bootstrap signal for ATSC 3.0 transmission will remain a candidate standard for nine months while prototype equipment is built and tested “in advance of balloting for the entire system,” ATSC said. “The bootstrap is a low-level signal that tells a receiver to decode and process wireless services multiplexed in a broadcast channel,” said ATSC President Mark Richer. “It’s designed to be a very robust signal and detectable even at low signal levels.” The bootstrap signal provides “a universal entry point into a broadcast waveform,” ATSC said. It uses a “fixed configuration” known to all receivers “and carries information to enable processing and decoding the wireless service associated with a detected bootstrap signal,” as well as a “flag” that indicates when an emergency alert is in effect, it said.