PAPR Reduction for Hybrid ACO-OFDM Aided IM/DD Optical Wireless Vehicular Communications

• Published in: IEEE transactions on vehicular technology Vol. 66; no. 10; pp. 9561 - 9566
• Main Authors: Baolong Li, Wei Xu, Hua Zhang, Chunming Zhao, Hanzo, Lajos
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive optics; Error reduction; High-speed optical techniques; Hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (HACO-OFDM); Optical distortion; Optical modulation; Optical wireless; optical wireless communications (OWC); Orthogonal Frequency Division Multiplexing; Peak to average power ratio; peak-to-average-power ratio (PAPR) reduction; Power efficiency; Time-domain analysis; Wireless communications
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2017.2698265

Hybrid asymmetrically clipped optical orthogonal frequency division multiplexing (HACO-OFDM) improves the spectral efficiency compared to asymmetrically clipped optical OFDM (ACO-OFDM) and pulse-amplitude-modulated discrete multitone (PAM-DMT) modulation, while retaining the advantage of high power efficiency. HACO-OFDM has found favor in numerous applications, but its peak-to-average-power ratio (PAPR) has remained a concern in optical wireless communications, since the family of existing PAPR reduction methods cannot be directly invoked for the superimposed HACO-OFDM signals. Hence, we analyze the characteristics of HACO-OFDM signals and develop a specific PAPR reduction technique relying on tone injection. Our numerical results show that the proposed method achieves significantly improved PAPR statistics compared to the conventional methods, leading to a significant bit error ratio (BER) reduction.