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Peak-to-average reduction with post-amplifier filter

a post-amplifier filter and peak-to-average technology, applied in the field of broadcasting, can solve the problems of high peak-to-average power ratio (papr) of transmitted ofdm signals, unresolved design problems of ofdm systems, and difficulty in keeping out-of-band power below the specified limi

Active Publication Date: 2018-06-14
GATESAIR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces the peak-to-average ratio of the signal entering the power amplifier, enabling more efficient amplification and compliance with transmission protocols while minimizing in-band distortion, trading bandwidth for peak reduction.

Problems solved by technology

Some challenging issues remain unresolved in the design of the OFDM systems, including the high Peak-to-Average Power Ratio (PAPR) of transmitted OFDM signals.
If the HPA is not operated in linear region with large power back-off, it is difficult to keep the out-of-band power below the specified limits.
This situation can lead to very inefficient amplification and expensive transmitters.

Method used

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  • Peak-to-average reduction with post-amplifier filter
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Examples

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Embodiment Construction

[0012]In the context of the present disclosure, the singular forms “a,”“an” and “the” can also include the plural forms, unless the context clearly indicates otherwise. The terms “comprises” and / or “comprising,” as used herein, can specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, and components.

[0013]Systems and methods in accordance with aspects of the invention can be applied to improve the peak-to-average ratio while considering the allowable level of distortion in a transmitted signal. The inventors have recognized that the value of a reduced peak to average signal is relevant in the final amplification of the signal, but not necessarily in the transmitted signal. Specifically, the cost of the amplifying system is driven by the peak-to-average ratio of the signal, but the transmission system after amplification is not as sensitive to th...

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Abstract

Systems and methods are provided for broadcasting a for broadcasting a modulated signal. A plurality of peaks is detected within a waveform envelope signal of the modulated signal. For each of the plurality of peaks, a pulse having substantial spectral content that is outside of a passband of a high power filter is constructed. The constructed pulse for each peak is subtracted from its associated peak to provide a peak-reduced signal. The peak-reduced signal is amplified at a power amplifier to provide an amplified signal. The amplified signal is filtered at the high power filter to provide a filtered signal. The filtered signal is broadcast at an associated antenna.

Description

TECHNICAL FIELD[0001]This invention relates to broadcasting, and more particularly, to of peak-to-average reduction of a waveform to be amplified.BACKGROUND OF THE INVENTION[0002]Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies that has developed into a popular scheme for wideband digital communications. Some challenging issues remain unresolved in the design of the OFDM systems, including the high Peak-to-Average Power Ratio (PAPR) of transmitted OFDM signals. Most radio systems employ a high power amplifier (HPA) in the transmitter to obtain sufficient transmissions power and the HPA is usually operated at or near the saturation region to achieve the maximum output power efficiency. Accordingly, nonlinear distortion due to high PAPR of the input signals can be introduced into the communication channels. If the HPA is not operated in linear region with large power back-off, it is difficult to keep the out-of-band...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L27/26H04L12/18H04B1/04H04L27/34
CPCH04L27/2623H04L12/18H04B2001/0408H04L27/3411H04B1/0475H04L27/0004
Inventor MATTSSON, ANDERSBERNDSEN, KEVIN
Owner GATESAIR