NDLI: Adaptive compensation for microwave linearizer

Content Provider	IEEE Xplore Digital Library
Author	Buoli, C. Cervi, L.A. Abbiati, A.
Copyright Year	1993
Description	Author affiliation: SIEMENS Telecomunicazioni S.p.A., 20060 Cassina de'Pecchi (MI) - Italy (Buoli, C.; Cervi, L.A.; Abbiati, A.)
Abstract	This paper presents a new adaptive microwave linearizer compensation system against temperature drifts and operating frequency variations (1). The main principle rests on the fact that for a QAM modulated RF carrier the signal envelope exhibits a fixed peak value to average value ratio which depends only on the constellation and on the roll-off factor. It follows that the peak to average value ratio of the SSPA output signal envelope has to be constant when the SSPA operates in the linear amplitude region. Moreover the peak to average ratio decreases or increases as the amplifier goes through a gain compression or gain expansion due to a change in temperature, operating frequency or in any other parameter. Therefore it can be used as a criterion on which to base the amount of AM/AM compensation to be introduced by the linearizer. This method exhibits good performance in a wide range of temperatures and frequencies while employing easy to implement low cost hardware.
Starting Page	439
Ending Page	442
File Size	4352123
Page Count	4
File Format	PDF
DOI	10.1109/EUMA.1993.336589
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-09-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Virtual manufacturing Equations Quadrature amplitude modulation Amplitude modulation Radio frequency Constellation diagram Peak to average power ratio Temperature distribution Radiofrequency amplifiers Frequency measurement
Content Type	Text
Resource Type	Article

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