No abstract

Due to the simplest way for PAPR reduction, clipping technique have been proposed and seem to be promising for use in commercial systems. In this paper, the conventional clipping technique is formulated as an adding signal technique for PAPR reduction. We show that, when clipping occurs very rarely, the adding signal for PAPR reduction commonly called "peakreducing signal" or "peak-cancelling signal" is approximately the distortion term resulting in the nonlinear processing of the OFDM envelope. This result may be extended to all forms of clipping.Later in this paper, the performance of clipping is characterized by deriving an asymptotic PAPR distribution of the clipped signal and by proposing a simple closed form of its Signalto-Noise-and-Distortion Ratio (SNDR) metric. These theoretical results corresponds to a special case of geometric method [1] which is an adding signal technique for PAPR reduction. Index Terms-Clipping technique, adding signal technique, Peak-to-Average Power Ratio (PAPR), Orthogonal Frequency Division Multiplexing (OFDM).

No abstract

No abstract

Orthogonal Frequency Division Multiplexing (OFDM) suffers from a high Peak-to-Average Power Ratio (PAPR). Tone Reservation (TR) is a popular PAPR reductiontechnique that uses a set of reserved subcarriers to carry the peak reducing signal. The major advantages of TR technique include no transmission performance degradation, no transmission of Side Information (SI) and downward compatibility. Because of all these benefits, TR seems to be promising for use in commercial standards such as Digital Video BroadcastingTerrestrial (DVB-T2). In this paper, due to a filtering based on FTT/IFFT pair, we propose to transform many adding signal techniques (like clipping techniques) to TR techniques in order to benefit of the TR advantages. As the transformation is a low-complexity process (about the FTT/IFFT complexity), the obtained technique results in a low-complexity TR technique. However, the transformation generates a loss of performance in PAPR reduction which can be improved by iterating the process of transformation. Later in the paper, the classical clipping technique is transformed to a TR technique called "clipping-based TR" technique and simulations results show that, for the same value of clipping level, clipping technique is better than "clipping-based TR" in terms of PAPR reduction, but "clipping-based TR" does not degraded the BER of the system unlike the clipping technique.