Referenced Items are not available for this document.
This work elucidates how the combined effects of power-amplifier distortion and local-oscillator (LO) pulling adversely impact a wireless direct-conversion transmitter (DCT) that adopts a time-varying envelope modulation. An analytical model is developed to evaluate the deterioration of DCT output signal quality, including error vector magnitude, adjacent channel power ratio, and spectral regrowth. Additionally, an integrated approach for PA linearization and anti-LO pulling is designed based on an open-loop digital-predistortion method and the proposed analog feedback compensation mechanism. Experimental results demonstrate that a quadrature-modulation-based DCT that incorporates the proposed approaches can significantly improve the LO spectral purity, while achieving a high linearity and efficiency performance simultaneously. These attributes are highly desired for third-generation systems such as cdma2000 1x and W-CDMA.
Published in:
Microwave Theory and Techniques, IEEE Transactions on
(Volume:60
,
Issue:
6
)
Date of Publication: June 2012
- Page(s):
- 2000 - 2009
- ISSN :
- 0018-9480
- INSPEC Accession Number:
- 12761169
- Digital Object Identifier :
- 10.1109/TMTT.2012.2193139
- Product Type:
- Journals & Magazines
- Date of Publication :
- 30 April 2012
- Date of Current Version :
- 25 May 2012
- Issue Date :
- June 2012
- Sponsored by :
- IEEE Microwave Theory and Techniques Society
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