HD Power Boost
HD Powerboost CoolCast at NAB 2010
Research Engineer Philip Schmid introduces Nautel's Asymmetrical Sideband technolog for Radio Magazine's CoolCast. Nautel recieved a Radio Magazine Cool Stuff award for Asymmetrical Sideband technology that was introduced at the NAB Radio Show in Las Vegas
Nautel NV10 demonstrating various IBOC injection levels, HD PowerBoost and asymmetrical sideband technology.
This video, taken from the AUI of a Nautel transmitter, shows an NV10 running at -20dBc and -10 dBc IBOC injection levels. The video also demonstrates increased power levels that can be achieved with Nautel's HD PowerBoost technology. This video also demonstrated the NV10s ability to run asymmetrical sidebands. In this case the sidebands are set to -10dB and -20dB.
HD Powerboost demo at NAB 2010 in Las Vegas
Research Engineer Philip Schmid demonstrates Nautel's new HD Powerboost technology which allows broadcasters to increase IBOC injection levels by up to 30% without the need to upgrade or replace the transmitter.
HD Power Boost, which garnered Radio World's Cool Concept award at NAB '09, is a revolutionary technology that increases HD Radio™ power output while at the same time increasing efficiency, and addresses the recent FCC HD injection level increase ruling. Initial release is targeted this year for NV series products, which provide up to 44kW of solid-state power.
HD Power Boost:
- -Reduces HD Radio™ conversion costs - transmitter investment savings of up to $22,000
- -Increases HD Radio transmitter power output - up to 30% at -10dB
- -Increases transmitter efficiency - up to 6% at -10dB
- -Reduces operating costs - efficiency savings of up to 12% on your power bill at -10dB
- -Reduces transmitter space requirements - up to half the physical footprint required
- -Reduces cost of listenership - adoption of HD Radio™ more affordable for broadcasters
- -Reduces digital interference - use of asymmetrical digital sidebands
How it Works
HD Power Boost uses an intelligent peak to average power ratio (PAPR) technique to squeeze more hybrid power from any given transmitter and increase hybrid-mode efficiency. The major difference between Nautel's PAPR reduction scheme and the standard method, developed by iBiquity Digital, is a difference in peak detection.
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Figure 1 illustrates standard PAPR reduction, which only operates on the digital signal and then adds the result to the analog signal. Figure 2 shows Nautel's method of taking the analog signal into account in detecting a peak. For a more detailed explanation of this technology, click here.
Results
Recent tests show a reduction in the PAPR from 4.51dB down to 3.19dB at an IBOC injection ratio of -10dB. This translates to a signifigant reduction in peak transmitter power requirements. For a station using an 8kW TPO and Nautel's PAPR reduction technique the transmitter would only need to handle peaks of 16.9kW rather than the 22.6kW peaks using standard PAPR reduction. These gains help make it more affordable for broadcasters to adopt the higher injection levels.
Innovative Solutions from Nautel
Learn more about Nautel's new line-up of low power FM transmitters |
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Available on all Nautel NV, NX and VS Series Transmitters |
HD Power Boost wins Radio Magazine Pick Hit award
HD PowerBoost Paper: A New Approach to Peak-to-Average-Power Reduction
HD Power Boost wins Radio World "Cool Concept" award
Nautel HD Power Boost: How it Works - Radio Magazine feature
Videos
Nautel's Head of Engineering Tim Hardy discusses HD Power Boost technology at NAB 2009