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On the Impact of Non-Linear Amplifiers in Single-Carrier Systems: An Analytical Approach

Single-carrier modulation is currently regaining attractiveness for high-speed communications standards. Because of its robustness towards analog hardware impairments, single-carrier modulation can get along with low transceiver accuracy as compared to multi-carrier modulation. One hardware impairment that can, however, still seriously degrade the performance of single-carrier systems is amplifier non-linearity. The degradation is usually not as high as for multi-carrier modulation but can still not be neglected in practice. The pulse shaping at the transmitter, which is required for spectral mask compliance, will lead to power peaks in the transmitted signal that are clipped by the non-linearity. This paper presents an analytical approach for evaluating the performance degradation caused by non-linear amplifiers in single-carrier systems. The distortion due to the clipping is characterized by means of a discrete noise distribution. Numerical results show that this approximation allows for accurately predicting the performance degradation in terms of BER curves without extensive simulations.