Analysis of Clipping Noise and Tone-Reservation Algorithms for Peak Reduction in OFDM Systems

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Orthogonal Frequency Division Multiplexing (OFDM) suffers from a high Peak-to-Average power Ratio (PAR). Tone reservation is a popular PAR reduction technique that uses a set of reserved tones to design a peak-canceling signal. In a previous paper by Krongold and Jones, an active-set approach was developed to efficiently compute the peak-canceling signal. In this paper, the authors consider the use of clipping noise, which is generated when the OFDM signal is clipped at a predefined threshold, to design the peak-canceling signal. To this end, the clipping noise is analyzed as a series of parabolic pulses under tone-reservation constraints. The single-pulse case and the multiple-pulse case are treated.