Publications (5)0 Total impact
Conference Paper: OFDM Power Ratio Reduction Using Invertible Clipping[Show abstract] [Hide abstract]
ABSTRACT: Large fluctuation of OFDM signal amplitude represents an important problem for amplification in mobile communication systems. In this paper, we propose a new peak-to-average power ratio (PAPR) reduction technique. It is based on the well known clipping and filtering technique. Our technique, called "invertible clipping", is performed thanks to an invertible clipping function. It generates less intermodulation product noise than classical clipping and filtering. Furthermore, since this invertible clipping function could be inverted in reception side, degradations are compensated. The derived method benefits from the advantages (e.g., PAPR reduction) of classical clipping and filtering technique but it exhibits small computational complexity as compared to other peak reduction methods
Conference Paper: Adjacent channel power ratio analysis for an OFDM signal[Show abstract] [Hide abstract]
ABSTRACT: The nonlinear power amplification of multi-carriers signals generates a lot of perturbations. Among them the power increase in the adjacent channels is studied in this paper. This phenomenon is characterized by the adjacent channel power ratio (ACPR) parameter. The analysis we perform in this paper allows us to find a general expression of ACPR versus the number of signal's sub-carriers, N. Then, we propose a new ACPR definition which permits to better characterize the increase of the shoulders (spectral regrowth). Another interest of our derivation is that we can find the parameters a<sub>1</sub> and a<sub>3</sub> of the amplifier's polynomial model for a desired ACPR.
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ABSTRACT: Large fluctuations of OFDM signal amplitude represent an important problem for power amplification in mobile communication systems. In this paper, we propose a new Peak-to-Average Power Ratio (PAPR) reduction method based on the well known clipping and filtering one. Called "invertible clipping", it is performed thanks to a "soft clipping function". Since this soft clipping can be inverted in reception side, degradations are compensated. The derived method benefits from the advantages of classical clipping and filtering method and exhibits small computational complexity as compared to other peak reduction methods. In this paper, we show, thanks to extensive simulation results, that our method offers a global gain, greater than 1 dB. That means that the power efficiency of the Power Amplifier (PA) increases of about 3.2 % which corresponds to a PA consumption gain of about 10 %.