Content area
This study focuses on a 4FSK-modulated ultraviolet (UV) communication system, introducing an innovative symbol-level maximum likelihood decoding approach based on Poisson statistics. A forward error correction (FEC) coding mechanism is integrated to enhance system robustness. Through Monte Carlo simulations, the proposed decoding scheme and the error correction performances of Reed–Solomon (RS) and Low-Density Parity-Check (LDPC) codes are evaluated in UV channels. Both RS and LDPC codes significantly improve the Bit Error Rate (BER), with LDPC codes achieving superior gains under low SNR conditions. Hardware implementation and field tests validate the decoding algorithm and LDPC-optimized 4FSK system. Under non-line-of-sight (NLOS) conditions (10–45° transmit elevation angle), stable 60 m communication with BER < 10−3 is achieved. In line-of-sight (LOS) scenarios, the system demonstrates 900 m range with BER < 10−3, highlighting practical applicability in challenging atmospheric environments.
Details
; Li Kangjian 1 ; Wang Xingfa 3 ; Li, Linyi 1 ; Zhu Huishi 3 ; Zhang, Weijie 3 ; Liu, Jianguo 3 1 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; [email protected] (L.K.); [email protected] (Y.Z.); [email protected] (K.L.); [email protected] (X.W.); [email protected] (L.L.); [email protected] (H.Z.); [email protected] (W.Z.), The College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
2 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; [email protected] (L.K.); [email protected] (Y.Z.); [email protected] (K.L.); [email protected] (X.W.); [email protected] (L.L.); [email protected] (H.Z.); [email protected] (W.Z.), School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
3 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China; [email protected] (L.K.); [email protected] (Y.Z.); [email protected] (K.L.); [email protected] (X.W.); [email protected] (L.L.); [email protected] (H.Z.); [email protected] (W.Z.)