REDUCTION OF NONLINEAR DISTORTION EFFECTS IN A PSK-OFDM SYSTEM
Abstract
Nonlinear distortion caused by High-Power Amplifiers significantly degrades the performance of Orthogonal Frequency Division Multiplexing systems employing amplitude–phase modulation schemes. Due to the high peak-to-average power ratio of OFDM signals, nonlinear effects introduce constellation rotation and in-band distortion, resulting in an increased bit error rate. In this paper, a pilot-based Automatic Phase Shift method for 16-PSK OFDM systems is proposed to mitigate nonlinear distortion at the receiver side. The proposed method estimates the phase rotation by comparing transmitted and received pilot symbols and compensates for this rotation automatically without requiring prior knowledge
of amplifier characteristics or system parameters.
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