Improving the Clipping-based Active Constellation Extension PAPR Reduction Technique for FBMC Systems

Tagelsir, Zahraa and Kollár, Zsolt (2025) Improving the Clipping-based Active Constellation Extension PAPR Reduction Technique for FBMC Systems. INFOCOMMUNICATIONS JOURNAL, 17 (3). pp. 45-53. ISSN 2061-2079

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Abstract

Filter Bank MultiCarrier (FBMC) systems are known for their superior spectral efficiency and flexibility of the spectral shape. These benefits are challenged by the high Peak-to-Average Power Ratio (PAPR) and the Complementary Cumulative Distribution Function (CCDF) of the modulated signal, degrading power amplifier efficiency and system performance, causing spectral leakage and increasing Bit Error Rate (BER). This paper investigates the possibility of improvement for clipping-based Active Constellation Extension (ACE) based PAPR reduction techniques for FBMC systems. A modified method is proposed, combining iterative clipping and enlipping. A dynamic Clipping Ratio (CR) selection method is provided to optimize the iterative process. The method also enhances the BER performance by leveraging an enlipping step to increase the transmit signal power. Furthermore, the complexity of the iterative process is reduced by applying efficient and low computational FBMC modulation and demodulation schemes. The simulation outcomes validate that the suggested method efficiently reduces PAPR, optimizes the CCDF and improves the BER performance. Furthermore, the proposed system complexity is also reduced compared to the previous solutions.

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