Prediction of a CDMA output spectrum based on intermodulation products of two-tone test

A prediction method of a code-division multiple-access (CDMA) output spectrum based on intermodulation (IM) products of a two-tone test is proposed in this paper. An RF power amplifier is mathematically modeled by a complex envelope transfer function and, using this model, analytical expressions of...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2001-05, Vol.49 (5), p.938-946
Main Authors: Yi, Seung-June, Nam, Sangwook, Oh, Sung-Hoon, Han, Jae-Hee
Format: Article
Language:English
Subjects:
Analytical models
Code division multiple access
Distortion
Distortion measurement
Exact solutions
Intermodulation
Mathematical analysis
Mathematical model
Mathematical models
Microwaves
Multiaccess communication
Power amplifiers
Prediction methods
Radio frequencies
Radio frequency
Radiofrequency amplifiers
Testing
Transfer functions
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Summary:A prediction method of a code-division multiple-access (CDMA) output spectrum based on intermodulation (IM) products of a two-tone test is proposed in this paper. An RF power amplifier is mathematically modeled by a complex envelope transfer function and, using this model, analytical expressions of IM products and a CDMA output spectrum are derived, respectively. By combining these two expressions, we finally derive an analytical expression that relates IM products to a CDMA output spectrum. It is shown in this expression that not only AM-AM, but also AM-PM distortion affects the CDMA output spectrum. Comparison between the measured and predicted results shows that the output spectrum predicted by this method agrees well with the measured spectrum.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.920152