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Performance assessment of DFT-OFDM and DWT-OFDM systems in the presence of the HPA nonlinearity

This paper investigates performance degradation of conventional Orthogonal Frequency Division Multiplexing (OFDM) and Discrete Wavelet Transform based OFDM (DWT-OFDM) systems when the signals are passed through a nonlinear High Power Amplifier (HPA). In the case of DWT-OFDM, several wavelets such as Daubechies, Symlet and Biorthogonal are evaluated. Simulation results show that DWT-OFDM — specifically Haar (dbl) — is more robust against nonlinearity in comparison to DFT-OFDM.