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NAB Sneak Peeks
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| Nautel Papers Discuss IBOC Transmission, Interference |
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4.08.2008
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Nautel says its staff will present several technical papers on digital topics like the debate on higher IBOC injection levels. The speakers will take part in Broadcast Engineering Conference sessions.
Nautel Research Engineer Philipp Schmid will join a panel as part of the “Radio Technology Advancements” session from 1–5:30 p.m. on Sunday. In his presentation, “A New Approach to Peak-to-Average-Power Reduction for FM IBOC Transmission,” Schmid states that many broadcasters have yet to transition to IBOC due to conversion costs, and a major cost factor is associated with peak-to-average power ratio.
“This session will present some novel ways to dramatically reduce PAPR without impacting the IBOC signal,” he said.
The BEC’s “Digital Radio Worldwide” session includes a presentation from Chuck Kelly, director of broadcast sales at Nautel, “Bandwidth and Frequency Allocation Issues in International Digital Radio AM and FM Broadcasting.” He says broadcasters and regulators are dealing with issues of occupied bandwidth and the impact of DRM and HD Radio implementation on co-channel and adjacent-channel interference. Kelly will provide theoretical analysis and real examples relating to this topic.
Gary Liebisch will discuss “Implications of IBOC Injection Levels Above –20 dB” on Wednesday as part of the “Radio RF and Transmission Systems session,” 2:00-5:00 p.m.
“The movement to increase IBOC injection to improve overall coverage and building penetration is gaining momentum,” said Liebisch. “This paper will provide installation recommendations and will discuss transmitter performance along with possibilities for enhancing transmission performance through peak-to-average radio reduction, pre-correction and combining techniques.”
Nautel Head of Research Tim Hardy will join Benjamin Dawson, president of Hatfield & Dawson, to discuss “Linear Effects of AM Narrow-Band Antenna Systems: Characterization by Direct Measurement and Transmitter Based Equalization,” also part of that Wednesday Radio RF and Transmission Systems session.
The presenters say spectrum analyzers, relied upon to verify antenna response along with transmitter out-of-band emissions, have problems when relating spectrum measurements at the transmitter output to far field measurements.
Booth: N7116
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