Referenced Items are not available for this document.
With the increasing importance of spectral efficiency in mobile communications, the power amplifier linearity has become a critical design issue for nonconstant envelope modulation. Imperfections in quadrature modulators and demodulators-gain and phase imbalance and DC offset-have a crippling effect on amplifier linearization circuits, a fact that has previously been noted experimentally. This paper is the first analysis of these effects on an adaptive predistorter. The primary result is an expression that provides an explicit tradeoff among intermodulation power, accuracy of the quadrature modulator and demodulator, and speed of adaptation. Another useful result is a simple and easily measured error figure for quadrature modulators and demodulators
Published in:
Vehicular Technology, IEEE Transactions on
(Volume:46
,
Issue:
2
)
Date of Publication: May 1997
- Page(s):
- 456 - 466
- ISSN :
- 0018-9545
- INSPEC Accession Number:
- 5587927
- Digital Object Identifier :
- 10.1109/25.580784
- Date of Current Version :
- 06 August 2002
- Issue Date :
- May 1997
- Sponsored by :
- IEEE Vehicular Technology Society
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