Code DivisionMultipleAccess (CDMA) technique has recently gained a particular interest for the design of satellite systems. The aim of this paper is to develop a theoretical characterization of non-linear distortion effects in CDMA systems for satellite communications, with reference to the effects of in-band interference. It is shown that the non-linear effects can be simply described by a complex scale factor and an additive noise on the decision variable at the receiver. In order to evaluate performance degradation, the curve of Total Degradation as a function of Output Back-Off (OBO) is taken as a reference. Two well known classes of High Power Amplifier (HPA) model are considered to obtain numerical results: Traveling Wave Tube Amplifier (TWTA) and Solid State Power Amplifier (SSPA)models. Both synchronous (orthogonal) and asynchronous systems are considered and, with regard to non-linear effects, the numerical results show a sort of equivalence between orthogonal CDMA and the OFDM technique.

Analytical characterization of non-linear effects in satellite CDMA systems

CONTI, Andrea;TRALLI, Velio
1999

Abstract

Code DivisionMultipleAccess (CDMA) technique has recently gained a particular interest for the design of satellite systems. The aim of this paper is to develop a theoretical characterization of non-linear distortion effects in CDMA systems for satellite communications, with reference to the effects of in-band interference. It is shown that the non-linear effects can be simply described by a complex scale factor and an additive noise on the decision variable at the receiver. In order to evaluate performance degradation, the curve of Total Degradation as a function of Output Back-Off (OBO) is taken as a reference. Two well known classes of High Power Amplifier (HPA) model are considered to obtain numerical results: Traveling Wave Tube Amplifier (TWTA) and Solid State Power Amplifier (SSPA)models. Both synchronous (orthogonal) and asynchronous systems are considered and, with regard to non-linear effects, the numerical results show a sort of equivalence between orthogonal CDMA and the OFDM technique.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1193082
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact