Dinis, RuiSilva, PauloAraújo, Teresa2012-10-152012-10-152009-08R. Dinis, P. Silva, T. Araújo, “Turbo Equalization with Cancelation of Nonlinear Distortion for CP-Assisted and Zero-Padded MC-CDMA Schemes”, IEEE Trans. Commun., vol. 57, nº. 7, pp. 2185-2189, Aug. 2009.0090-6778AUT: PSI00617;http://hdl.handle.net/10400.1/1750In this paper, we consider MC-CDM schemes (MultiCarrier Code Division Multiplexing) where clipping techniques are employed to reduce the envelope fluctuations of the transmitted signals. Both CP-assisted (Cyclic Prefix) and ZP (Zero- Padded) MC-CDM schemes are studied. We develop frequencydomain turbo equalizers combined with an iterative estimation and cancelation of nonlinear distortion effects, with relatively low complexity since they allow FFT-based (Fast Fourier Transform), frequency-domain implementations. Our performance results show that the proposed receivers allow significant performance improvements at low and moderate SNR (Signal-to-Noise Ratio), even when strongly nonlinear transmitters are employed. The receiver for ZP MC-CDM is of special interest for systems where the duration of the channel impulse response is not a small fraction of the duration of the MC-CDM blocks, being suitable to MC-CDM systems with very large blocks (hundreds or even thousands of subcarriers), since they do not require the inversion nor the multiplication of large matrixes.engMC-CDMZero-padded MC-CDMTurbo equalizationNonlinear distortionjournal article