Characterization of HPA using two dimensional general memory polynomial for dual band carrier aggregated mimo-OFDM systems

This paper analyzes the impact of nonlinear distortion caused by high power amplifier (HPA) on a dual band carrier aggregated multi input multi output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. A two dimensional (2D) general memory polynomial (GMP) has been used to characterize the behavioural model of HPA. The inband and cross modulation distortion, caused by nonlinear HPA on the carrier aggregated MIMO-OFDM system can be modelled in terms of complex phase shift and Gaussian nonlinear noise that distorted the received data symbol. The mathematical expressions for the complex phase shift and variance of Gaussian nonlinear noise have been formulated. Furthermore, this analysis is also augmented to evaluate the overall performance of aggregated MIMO-OFDM system in terms of probability of symbol error for Mary quadrature amplitude modulation (M-QAM) in presence of multi-path Rayleigh fading channel. Simulation results demonstrate the validity of analytically derived expressions.

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