Performance Analysis of LDPC Codes for Wireless Optical Communication Systems in Different Seawater Environments

Optical signal is severely attenuated in seawater, which affects the performace of underwater wireless optical communication(UWOC) system and limits the wireless optical transmission distance. In this paper, wireless optical seawater channel transmission model is analyzed and established. And based on the transmission model, the OOK optical modulation and LDPC codes is combined to analyze the performance of the UWOC system and the transmission distance of wireless optical(TDWO) in different seawater environments. The results show that the clearer the water quality, the better performance of LDCP coding system. And when the optical source is 30mW, the TDWO is less than 6.2m,the coding system can improve the system performance in offshore environment.