Minimization of OFDM Clipped Samples Power by Tone Reservation Algorithm

Conference: European Wireless 2017 - 23th European Wireless Conference
05/17/2017 - 05/19/2017 at Dresden, Germany

Proceedings: European Wireless 2017

Pages: 6Language: englishTyp: PDF

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Kryszkiewicz, Pawel; Kliks, Adrian (Poznan University of Technology, Poznan, Poland)

Nonlinear distortion of a signal at a nonlinear Power Amplifier (PA) is a serious problem preventing Orthogonal Frequency Division Multiplexing (OFDM) systems from achieving high energy-efficiency. This paper addresses this issue by proposing Clipping-Aware Tone Reservation (CA-TR) method. It minimizes cumulative power of all samples exceeding a given clipping threshold in contrast to typically used maximal peak power minimization techniques. Convex optimization function is defined and solved using Newton’s method followed by line search algorithm. Low computational complexity of the solution is achieved by utilization of Fast Fourier Transform (FFT) blocks. Simulation results confirm this approach is advantageous over typically used Peak-to-Average Power Ratio (PAPR) minimization in terms of Signal-to-Distortion Ratio (SDR).