Efficient feedforward linearization technique using genetic algorithms for OFDM systems
作者： Paloma García , Jesúsde Mingo , PedroLuis Carro , Antonio Valdovinos
DOI: 10.1155/2010/354030
关键词: Wideband 、 Amplitude 、 Control theory 、 Orthogonal frequency-division multiplexing 、 Computer science 、 Intermodulation 、 Genetic algorithm 、 Bandwidth (signal processing) 、 Nonlinear system 、 Linearization 、 Feed forward
摘要: Feedforward is a linearization method that simultaneously offers wide bandwidth and good intermodulation distortion suppression; so it choice for Orthogonal Frequency Division Multiplexing (OFDM) systems. structure consists of two loops, being necessary an accurate adjustment between them along the time, when temperature, environmental, or operating changes are produced. Amplitude phase imbalances circuit elements in both loops produce mismatched effects lead to degrade its performance. A proposed compensate these mismatches, introducing complex coefficients calculated by means genetic algorithm. full study carried out choose optimal parameters algorithm applied wideband systems based on OFDM technologies, which very sensitive nonlinear distortions. The functionality has been verified simulation.
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