Theoretical analysis and performance of OFDM signals in nonlinear fading channels
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
An efficient measure for nonlinear distortion severity due to HPA in downlink DS-CDMA signals
EURASIP Journal on Wireless Communications and Networking
BER Performance of OFDM Signals in Presence of Nonlinear Distortion due to SSPA
Wireless Personal Communications: An International Journal
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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.