An Iterative Detection Technique for DS-CDMA Signals with Strong Nonlinear Distortion Effects

Abstract - Whenever a DS-CDMA signal (Direct Sequence Code Division Multiple Access) is the sum of several components associated to different spreading codes (e.g., the DS-CDMA signal to be transmitted by the BS (Base Station) in the downlink, or any multicode DSCDMA signal), it has high envelope fluctuations, and a high PMEPR (Peak-to-Mean Envelope Power Ratio) setting strong linearity requirements for the power amplifiers. For this reason, it is desirable to reduce the envelope fluctuations of the transmitted signals. A promising class of nonlinear signal processing schemes, combining a nonlinear operation in the timedomain with a linear, frequency-domain filtering operation, was recently proposed for reducing the envelope fluctuations (and, inherently, the PMEPR) of DS-CDMA signals, while maintaining the spectral occupation of the corresponding conventional DS-CDMA signals. However, the performance degradation due to the nonlinear distortion effects on the transmitted signals can be...

• Type: Conference
• Year: 2006
• Where: VTC
• Authors: Rui Dinis, Paulo Silva
• Keywords: Ds-cdma Signals, Envelope Fluctuations, Nonlinear Distortion Effects, VTC 2006