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Analysis of BER performance in presence of nonlinear distortion due to PD-HPA in downlink DS-CDMA signals

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3 Author(s)
T. K. Helaly ; Department of Systems and Computer Engineering, Carleton University, Ottawa, ON, K1S 5B6 Canada ; R. M. Dansereau ; M. El-Tanany

A predistorter-high power amplifier (PD-HPA) pair has become a common practice in wireless communication to compensate for nonlinear distortion due to HPA. However, the PD-HPA pair still produces severe signal distortion when the input signal exceeds the PD-HPA's saturation level. The effects of such distortion on bit error rate (BER) degradation in downlink direct sequence-code division multiple access signals (DS-CDMA) are analyzed. We establish which signal characteristics at the HPA input are the factors contributing to BER. Assuming that the baseband CDMA signal is characterized as a complex Gaussian process, we develop analytic expressions for the BER and the contributing factors to BER.

Published in:

IEEE Communications Letters  (Volume:14 ,  Issue: 4 )