Title :
On the degradation of OFDM-signals due to peak-clipping in optimally predistorted power amplifiers
Author_Institution :
Res. Center, Deutsche Telekom AG, Darmstadt, Germany
Abstract :
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
Keywords :
OFDM modulation; circuit noise; circuit optimisation; error statistics; intermodulation distortion; power amplifiers; OFDM bandpass signals; OFDM-signals degradation; bandpass signals; demodulator; i.i.d. Gaussian random variables; ideal predistortion; intermodulation distortion; intermodulation noise; modulation alphabets; optimally predistorted power amplifiers; peak-clipping; power back-off; power density spectra; small error probabilities; small symbol alphabet; Additive white noise; Baseband; Degradation; Demodulation; Distortion; Error probability; Gaussian noise; OFDM; Power amplifiers; Power system modeling;
Conference_Titel :
Global Telecommunications Conference, 1998. GLOBECOM 1998. The Bridge to Global Integration. IEEE
Conference_Location :
Sydney,NSW
Print_ISBN :
0-7803-4984-9
DOI :
10.1109/GLOCOM.1998.776868
