Achieving a Desired Deterministic Upper Bounde PAPR value using a Fast Adaptive Clipping
Résumé
Orthogonal Frequency Division Multiplexing (OFDM) is the most commonly used multicarrier modulation in telecommunication systems due to the efficient use of the frequency resources and its robustness to multipath fading channels. However, as multicarrier signal in general, Peak-to-Average-Power Ratio (PAPR) is one of the major drawbacks of OFDM signals. Many works exist in the scientific literature on PAPR mitigation such as clipping methods, Tone Reservation based approaches, Partial Transmit Signals. However, in this paper we focus on clipping methods. This last is one of the most efficient adding signal techniques for PAPR reduction in terms of complexity. Nevertheless, clipping presents many drawbacks such as bit error rate degradation, out-of-band emission and mean power degradation. Adaptive clipping has been recently proposed in order to decrease these drawbacks. However, this approach is expensive in terms of numerical complexity, because an optimal threshold should be found for each OFDM symbol. This paper proposes a new approach to efficiently achieve the adaptive clipping, in terms of iterations number to find the optimal threshold. Theoretical analysis and simulation results validate the interest of this new clipping method.
for all subcarriers.