Title :
A reconsideration of the pth-order inverse predistorter
Author :
Cheng, Chi-Hao ; Powers, Edward J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Abstract :
The pth-order inverse has been used for nonlinearity compensation for many years. According to pth-order inverse theory, pth-order inverse predistorters and equalizers are identical. However, there is one point often overlooked by many researchers. The pth-order inverse predistorter might change the input signal characteristics so that the Volterra model of the nonlinear system to be compensated, and upon which the pth-order inverse predistorter is designed, can no longer capture the nonlinear system behavior. This phenomenon will degrade the performance of the pth-order inverse predistorter. This performance degradation of a pth-order inverse predistorter becomes more serious when the Volterra model of the nonlinear system is derived for simple testing signals such as PSK. This important, yet often overlooked, phenomenon is investigated in detail
Keywords :
Butterworth filters; Volterra series; electric distortion; equalisers; inverse problems; low-pass filters; nonlinear systems; phase shift keying; quadrature amplitude modulation; travelling wave amplifiers; Butterworth lowpass receiver filter; Butterworth lowpass transmitter filter; PSK; QAM; Volterra model; Volterra series; high power amplifier; input signal characteristics; nonlinear system; nonlinearity compensation; performance degradation; pth-order inverse equalizers; pth-order inverse predistorter; pth-order inverse theory; testing signals; traveling wave tube power amplifier; Degradation; Equalizers; Kernel; Nonlinear distortion; Nonlinear systems; Phase shift keying; Predistortion; Signal design; System testing; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780597
