Title :
An Adaptive Nonlinearity Compensation Scheme for OFDM Communication Systems
Author :
Ding, Yuanming ; Nilkhamhang, Itthisek ; Sano, Akira
Author_Institution :
Liaoning Key Lab of Intelligent Inf. Process., Dalian Univ., Liaoning
Abstract :
An adaptive predistortion linearization is proposed to compensate for the nonlinear distortions induced by high power amplifiers (HPAs) in orthogonal frequency division multiplexing (OFDM) systems. By expressing the uncertain nonlinear input-output dynamics of HPA by a new simplified Volterra series model (VSM), a predistorter (i.e., compensator) is constructed based on identification of inverse system of the HPA. Once predistorter´s parameters are obtained by RLS algorithm, when OFDM signals pass through the cascade system of the predistorter and the HPA, overall linearization from predistorter input to HPA output can be achieved even if HPA is uncertain. The effectiveness of the proposed predistortion method is validated by numerical simulation for 64-ary quadrature amplitude modulation OFDM (64QAM-OFDM) transmission systems
Keywords :
OFDM modulation; Volterra series; compensation; linearisation techniques; 64-ary quadrature amplitude modulation OFDM transmission system; OFDM communication systems; Volterra series model; adaptive compensation; adaptive nonlinearity compensation scheme; adaptive predistortion linearization; high power amplifiers; orthogonal frequency division multiplexing; Adaptive systems; High power amplifiers; Nonlinear distortion; Nonlinear dynamical systems; Numerical simulation; OFDM; Power system modeling; Predistortion; Quadrature amplitude modulation; Resonance light scattering; Identification; adaptive compensation; linearization; power amplifier;
Conference_Titel :
Intelligent Control and Automation, 2006. WCICA 2006. The Sixth World Congress on
Conference_Location :
Dalian
Print_ISBN :
1-4244-0332-4
DOI :
10.1109/WCICA.2006.1712658
