On the degradation of OFDM-signals due to peak-clipping in optimally predistorted power amplifiers

The intermodulation noise in OFDM bandpass signals after passing an optimally predistorted power amplifier is investigated by a combination of analytical and numerical calculation. The results are illustrated for several modulation alphabets and it is shown that with ideal predistortion and a small symbol alphabet only a few dB of power back-off are required to achieve small error probabilities.

[1]  Luis B. Lopes,et al.  Performance of amplitude limited multitone signals , 1994, Proceedings of IEEE Vehicular Technology Conference (VTC).

[2]  Athanasios Papoulis,et al.  Probability, Random Variables and Stochastic Processes , 1965 .

[3]  D.J.G. Mestdagh,et al.  Analysis of clipping effect in DMT-based ADSL systems , 1994, Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications.

[4]  R. Gross,et al.  SNR and spectral properties for a clipped DMT ADSL signal , 1994, Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications.

[5]  C. Rapp,et al.  Effects of HPA-Nonlinearity on a 4-DPSK/OFDM-Signal for a Digital Sound Broadcasting System. , 1991 .

[6]  James E. Mazo.  Asymptotic distortion spectrum of clipped, DC-biased, Gaussian noise [optical communication] , 1992, IEEE Trans. Commun..