Title :
Nonlinear predistortion of OFDM signals over frequency-selective fading channels
Author :
D´Andrea, Aldo N. ; Lottici, Vincenzo ; Reggiannini, Ruggero
Author_Institution :
Dept. of Inf. Eng., Pisa Univ., Italy
fDate :
5/1/2001 12:00:00 AM
Abstract :
The linearization technique known as amplitude and phase (A&P) predistortion, proposed by D´Andrea and Lottici, is applied to the orthogonal frequency-division multiplexing (OFDM) transmission context with nonlinear radio-frequency high-power amplification. The above technique is shown to provide a major enhancement in power efficiency in comparison with the unprotected system, as well as a nonnegligible gain over an alternative linearization strategy, identified as minimum mean-square-error (MMSE) predistortion, presented in the literature for application to OFDM. The relative performance of the A&P and the MMSE predistorter schemes is assessed over the additive white Gaussian noise channel and also in a frequency-selective fading environment. The impact of adjacent channel interference is also discussed
Keywords :
AWGN channels; OFDM modulation; adjacent channel interference; fading channels; least mean squares methods; linearisation techniques; nonlinear distortion; power amplifiers; radiofrequency amplifiers; MMSE predistorter scheme; OFDM signals; additive white Gaussian noise channel; adjacent channel interference; amplitude and phase predistortion; frequency-selective fading channels; linearization technique; minimum mean-square-error; nonlinear predistortion; nonlinear radio-frequency high-power amplification; orthogonal frequency-division multiplexing transmission; power efficiency; Bit error rate; Digital video broadcasting; Frequency division multiplexing; Frequency-selective fading channels; Linearization techniques; Nonlinear distortion; OFDM; Predistortion; Quadrature amplitude modulation; Radio frequency;
Journal_Title :
Communications, IEEE Transactions on
