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As an effective technique for combating multipath fading and for high data rate transmission over wireless channels, orthogonal frequency division multiplexing (OFDM) is extensively used in high-rate wireless communication systems, such as, the wireless local area network (WLAN) and the digital television terrestrial broadcasting (DTTB) to support high performance bandwidth-efficient multimedia services. OFDM-based multi-carrier systems are much more sensitive to the nonlinear distortion at the transmitter and the imperfect parameters estimation at the receiver than the single carrier systems. In this paper, the compositive performance effects induced on the OFDM signal by the nonlinear distortion and the imperfect parameters estimation are investigated, a closed form of symbol error probability of the OFDM-based system with nonlinear distortion and imperfect parameters estimation is derived. Theoretical results show closely matching with those obtained by simulations for the OFDM-based system with QPSK, 16QAM, 64QAM modulations.