The effect of nonlinearity on a QPSK-OFDM-QAM signal

@article{citeulike:2933325, abstract = {The effect of nonlinearity on a QPSK-OFDM-QAM signal is analyzed. One of the characteristics of an OFDM-QAM signal is its wide range of envelope fluctuation: its crest factor, defined as the ratio of the peak instantaneous power to the average (rms) power in dB, is typically greater than 10. When an OFDM-QAM signal drives a nonlinear device, nonlinearity will result in signal compression and intermodulation among the sub-carriers at the output. An analytical method is used to predict the input back-off needed to keep the intermodulation below an acceptable level. For sufficient large number of sub-carriers, we show that to keep the intermodulation power 30 dB below the signal power, we need to back-off the input power by 6.5 dB. However, from the BER point of view, the degradation is less than 2 dB at BER=0.01\% even for 1 dB input back-off}, author = {Liu, Chia-Liang }, booktitle = {Consumer Electronics, IEEE Transactions on}, citeulike-article-id = {2933325}, doi = {10.1109/30.628655}, journal = {Consumer Electronics, IEEE Transactions on}, keywords = {modulation, nonlinear}, number = {3}, pages = {443--447}, posted-at = {2008-06-27 11:41:44}, priority = {2}, title = {The effect of nonlinearity on a QPSK-OFDM-QAM signal}, url = {http://dx.doi.org/10.1109/30.628655}, volume = {43}, year = {1997} }

TY - JOUR ID - citeulike:2933325 L3 - citeulike-article-id:2933325 TI - The effect of nonlinearity on a QPSK-OFDM-QAM signal T2 - Consumer Electronics, IEEE Transactions on JF - Consumer Electronics, IEEE Transactions on VL - 43 IS - 3 SP - 443 EP - 447 N2 - The effect of nonlinearity on a QPSK-OFDM-QAM signal is analyzed. One of the characteristics of an OFDM-QAM signal is its wide range of envelope fluctuation: its crest factor, defined as the ratio of the peak instantaneous power to the average (rms) power in dB, is typically greater than 10. When an OFDM-QAM signal drives a nonlinear device, nonlinearity will result in signal compression and intermodulation among the sub-carriers at the output. An analytical method is used to predict the input back-off needed to keep the intermodulation below an acceptable level. For sufficient large number of sub-carriers, we show that to keep the intermodulation power 30 dB below the signal power, we need to back-off the input power by 6.5 dB. However, from the BER point of view, the degradation is less than 2 dB at BER=0.01% even for 1 dB input back-off KW - modulation KW - nonlinear AU - Liu, Chia-Liang PY - 1997/// UR - http://dx.doi.org/10.1109/30.628655 ER -