DocumentCode :
3239856
Title :
ACPR prediction of CDMA systems through statistical behavioural modelling of power amplifiers with memory
Author :
Goh, Tracey S L ; Pollard, Roger D.
Author_Institution :
Sch. of Electron. & Electr. Eng., Leeds Univ., UK
Volume :
2
fYear :
2002
fDate :
25-28 Nov. 2002
Firstpage :
1189
Abstract :
Behavioural models for power amplifiers (PA) have traditionally been developed based on conventional AM-AM and AM-PM curves from one-tone measurements, which discounts the presence of memory in the system. However, as signal bandwidth increases in spread spectrum systems, memory effects become more severe. These effects result from the frequency response of matching networks, nonlinear capacitances of the transistors and the response of the bias networks. Multi-stage high power amplifiers require more accurate behavioural models to provide a better description of memory effects and highly nonlinear characteristics than memoryless models based on single-tone transfer characteristics. This is achieved using measured two-tone transfer characteristics of the amplitude and phase of the fundamental, IM3 and IM5 components, which have highly nonlinear components that represent the amplifier´s significant memory. A statistical technique is then applied which allows accurate, fast and efficient prediction of the adjacent channel power ratio (ACPR) of the communication system without time-consuming time-domain simulations.
Keywords :
adjacent channel interference; code division multiple access; power amplifiers; spread spectrum communication; ACPR prediction; CDMA systems; IM3 components; IM5 components; adjacent channel power ratio; behavioural models; bias networks; frequency response; highly nonlinear characteristics; matching networks; memory effects; multi-stage high power amplifiers; nonlinear capacitances; power amplifiers; signal bandwidth; spread spectrum systems; statistical behavioural modelling; two-tone transfer characteristics; Bandwidth; Capacitance; Frequency response; High power amplifiers; Multiaccess communication; Power amplifiers; Power measurement; Power system modeling; Predictive models; Spread spectrum communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communication Systems, 2002. ICCS 2002. The 8th International Conference on
Print_ISBN :
0-7803-7510-6
Type :
conf
DOI :
10.1109/ICCS.2002.1183321
Filename :
1183321
Link To Document :
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