An evaluation of hybrid tone reservation method for PAPR reduction using power amplifier with memory effects
Résumé
A new technique known as Hybrid Tone Reservation (HTR) for Peak-to-Average Power Ratio (PAPR) reduction in OFDM systems has been proposed. It is shown that this new technique, based on the inclusion of the Guard Interval (GI) signal into the well-known Tone Reservation using Null-Subcarriers (TRNS) technique can significantly increase the PAPR reduction gain. In this paper, we propose to extend the performance evaluation of the HTR technique over Additive White Gaussian Noise (AWGN) channels in presence of a RF Power Amplifier (PA) model with memory effects. Simulation were carried out under the IEEE 802.11a standard in presence of a commercial 2W class-AB PA from RF Micro Devices. The model parameters of the considered PA were estimated by an experimental based method. The evaluation results in terms of Bit Error Rate (BER), Error Vector Magnitude (EVM) an spectral regrowth show that this new technique allows using the PA at high output level and consequently high power efficiency, while maintaining a good transmission quality compared to the classical TRNS method. These results highlight the performances of this technique in presence of PA nonlinearity.