Title :
The usability of distance degradation in estimation of signal to noise ratio degradation caused by the effect of nonlinear transmit amplifiers and optimum additional phase shift in 256-QAM systems
Author :
Nguyen Quoc Binh ; Nguyen Thanh Bien ; Nguyen Toan Thang
Author_Institution :
Vietnam Mil. Tech. Acad., Nguyen
Abstract :
A parameter called as distance degradation (dd) has been proposed for the nonlinearity of HPA (High Power Amplifier) in M-QAM (M-ary Quadrature Amplitude Modulation) systems and some empirical fomulae using this parameter to calculate approximately the signal-to-noise degradation (SNRD) caused by nonlinear transmit HPA and the optimum additional phase shift (OAPS) of the carrier at the receiver for compensating the effect of the nonlinear distortion in 16- and 64-QAM systems have been found. The usability of dd as well as the influence of pulse shaping on the SNRD in 256-QAM systems are presented in this paper for 256-QAM.
Keywords :
power amplifiers; quadrature amplitude modulation; 256-QAM systems; M-ary quadrature amplitude modulation; distance degradation; high power amplifier; nonlinear transmit amplifiers; optimum additional phase shift; pulse shaping; signal to noise ratio degradation; Bit error rate; Degradation; Filters; High power amplifiers; Intersymbol interference; Nonlinear distortion; Phase estimation; Pulse shaping methods; Signal to noise ratio; Usability;
Conference_Titel :
Advanced Technologies for Communications, 2008. ATC 2008. International Conference on
Conference_Location :
Hanoi
Print_ISBN :
978-1-4244-2680-5
Electronic_ISBN :
978-1-4244-2681-2
DOI :
10.1109/ATC.2008.4760570
