Title :
Analysis of Spectral Regrowth on Forward-Link CDMA Signals Based on Fifth-order Nonlinear Distortion
Author :
Ying, Shi ; Maoliu, Lin ; YiPing, Chen ; Juan, Li
Author_Institution :
Harbin Inst. of Technol., Harbin
Abstract :
In this paper, based on the time domain model of the forward-link CDMA signal, analytical expressions relating the spectral regrowth of the CDMA signal passed through a nonlinear amplifier with a digitally modulated carrier to both the third-order intercept point and fifth-order intercept point, IP3 and IP5, were derived using the power series and high-order cumulant. This statistical method considers the nonlinear transformation of statistical properties of moments of a complex Gaussian random variable to develop a simple expression for the autocorrelation of the output signal. Analytical results are useful in finding optimal operating conditions of the power amplifier. In the end, the comparison between the simulation and practical measurement show that a better fit using both IP3 and IP5 than using only IP3.
Keywords :
code division multiple access; higher order statistics; nonlinear distortion; power amplifiers; radiofrequency amplifiers; time-domain analysis; complex Gaussian random variable; digitally modulated carrier; fifth-order nonlinear distortion; forward-link CDMA signals; high-order cumulant; nonlinear amplifier; nonlinear transformation; power amplifier; power series; spectral regrowth; statistical method; time domain model; Digital modulation; High power amplifiers; Multiaccess communication; Nonlinear distortion; Random variables; Signal analysis; Spectral analysis; Statistical analysis; Time domain analysis; Time series analysis; Autocorrelation Function; CDMA; High-order cumulant; Power Spectrum Density; Spectral Regrowth;
Conference_Titel :
Electronic Measurement and Instruments, 2007. ICEMI '07. 8th International Conference on
Conference_Location :
Xi´an
Print_ISBN :
978-1-4244-1136-8
Electronic_ISBN :
978-1-4244-1136-8
DOI :
10.1109/ICEMI.2007.4350653
