Title :
OFDM performance in amplifier nonlinearity
Author :
Merchan, S. ; Armada, A. Garcia ; Garcia, J.L.
Author_Institution :
Dept. of Commun. Eng., Cantabria Univ., Santander, Spain
fDate :
3/1/1998 12:00:00 AM
Abstract :
The activities of the current European RACE and ACTS projects have led to an increasing interest in OFDM (orthogonal frequency division multiplexing) as a means of combating impulsive noise and multipath effects and making fuller use of the available bandwidth of the system. This paper analyses the performance of OFDM signals in amplifier nonlinearity. In particular, bit error rate (BER) degradation as a result of amplitude limiting or clipping are analysed. In the presence of both nonlinear distortion and additive Gaussian noise, optimized output power back off is provided to balance the requirements of minimum BER and power amplifier efficiency. For this purpose, an OFDM system has been built using the SPW (Signal Processing Worksystem) simulator
Keywords :
Gaussian noise; coding errors; digital television; error statistics; frequency division multiplexing; multipath channels; quadrature amplitude modulation; quadrature phase shift keying; radiofrequency amplifiers; television broadcasting; 16QAM; ACTS project; BER degradation; Europe; OFDM performance; OFDM signals; QPSK; RACE project; Signal Processing Worksystem simulator; additive Gaussian noise; amplifier nonlinearity; amplitude clipping; amplitude limiting; bandwidth; bit error rate; digital TV broadcasting; impulsive noise; multipath effects; nonlinear distortion; optimized output power back off; orthogonal frequency division multiplexing; power amplifier efficiency; Additive noise; Bandwidth; Bit error rate; Degradation; Limiting; Nonlinear distortion; OFDM; Performance analysis; Power amplifiers; Signal analysis;
Journal_Title :
Broadcasting, IEEE Transactions on
