Effects of AM/AM and AM/PM distortion on spectral regrowth in 3GPP W-CDMA BS power amplification

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作者：
Staudinger, J. [1 ]
机构：
[1] Staudinger, J.
来源：
Staudinger, J. | 1600年 / Horizon House卷 / 45期
关键词：
Amplification - Amplitude modulation - Approximation theory - Code division multiple access - Computer simulation - Frequency modulation - Signal distortion - Transfer functions;
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摘要：
The effects of amplitude and phase nonlinearities in a power amplifier, which lead to spectral regrowth, are examined in the context of a 3GPP W-CDMA forward link (base station) environment. Behavioral modeling and simulation techniques are applied first to independently examined the relationship between AM/AM and AM/PM conversion and spectral regrowth. This analysis suggests that compressing the peak envelope excursions by several decibels of gain compression still results in a tolerable level of spectral regrowth. Conversely, limited phase distortion appears as a key element in developing linear power amplifiers with linearity margin to the 3GPP specification. Experimental results, obtained by digitally predistorting a 3GPP W-CDMA compliant signal to correct only for the amplifier's AM/PM conversion, provide supporting evidence.
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