Nautel’s award-winning HD PowerBoost™ GEN4 is a revolutionary technology that increases HD Radio™ power output while at the same time increasing efficiency, and addresses the FCC HD injection level increase ruling.



How it Works

HD PowerBoost 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.
Figure 1 above 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.

HD PowerBoost: How it Works »


Tests show a reduction in the PAPR from 4.51 dB down to 3.19 dB at an IBOC injection ratio of -10 dB. This translates to a significant reduction in peak transmitter power requirements. For a station using an 8 kW TPO and Nautel’s PAPR reduction technique the transmitter would only need to handle peaks of 16.9 kW rather than the 22.6 kW peaks using standard PAPR reduction. These gains help make it more affordable for broadcasters to adopt the higher injection levels.

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