Hartley-Domain DD-FTN Algorithm for ACO-SCFDM in Optical-Wireless Communications

• Published in: IEEE photonics journal Vol. 11; no. 4; pp. 1 - 9
• Main Authors: Shan, Chun, Zhou, Ji, Guo, Dong, Wang, Haide, Liu, Long, Wang, Qi, Liu, Weiping, Yu, Changyuan
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.08.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: ACO-SCFDM system; Algorithms; Bandwidth; Bandwidths; Bit error rate; Carrier frequencies; Computer simulation; Distortion; Equalization; free-space communications; Frequency division multiplexing; HD-DD-FTN algorithm; OFDM; Optical distortion; Optical noise; Optical sensors; Optical transmitters; optical-wireless communications; Wireless communications
• ISSN: 1943-0655; 1943-0647; 1943-0647
• DOI: 10.1109/JPHOT.2019.2925007

In this paper, we propose a Hartley-domain direct-detection faster-than-Nyquist (HD-DD-FTN) algorithm for asymmetrically clipped optical single-carrier frequency-division multiplexing (ACO-SCFDM) in optical-wireless communications (OWC). The HD-DD-FTN algorithm includes modified Hartley-domain equalization (HDE) and maximum likelihood sequence detection, which can simultaneously compensate serious high-frequency distortion and eliminate enhanced in-band noise for the bandwidth-limited OWC. Modified HDE can be implemented by real-valued operations, which is appropriate for dealing with real-valued signals. The simulation results show that ACO-SCFDM system using the HD-DD-FTN algorithm is more robust to inter-symbol interference than that using conventional HDE algorithm. Therefore, the bit error rate performance of the ACO-SCFDM system using HD-DD-FTN algorithm is better than that using the conventional HDE algorithm. In conclusion, the ACO-SCFDM system using the HD-DD-FTN algorithm shows great potential for bandwidth-limited OWC.