Mitigation of Nonlinear Amplifier Distortion for CP-OFDM Based Cognitive Radio Systems
Hanen Lajnef, Maha Cherif Dakhli, Moez Hizem, Ridha Boullègue · 2018
To reach a high data rate Quality of Service (QoS), the fifth generation (5G) was combined with the promising technology Cognitive Radio (CR), which can address the spectrum scarcity problem by means of dynamic spectrum sensing (SS). Therefore, the (SS) is an essential requirement of CR which detects and share the unused spectrum without having harmful interference on other users. In this paper, we investigate the effect of nonlinear distortions due to high-power amplifier (HPA) on the performances of the OFDM-CR system (orthogonal frequency division multiplexing based on cognitive radio). Afterward, in order to improve its performance, an iterative compensation algorithm employing the Nonlinear Distortion cancellation (NDC) principle was investigated.