Performance Analysis of LDPC-Coded OFDM in Underwater Wireless Optical Communications.

Guo, Jianzhong; Xiao, Jinpeng; Chen, Jing; Shan, Xin; Kong, Dejin; Wu, Yan; Ai, Yong

The performance of Low-Density Parity-Check (LDPC)-coded Orthogonal Frequency Division Multiplexing (OFDM) is investigated over turbulence channels in underwater wireless optical communications (UWOC). The relation between the bit error ratio (BER) and parameters such as the scintillation coefficient, signal-to-noise ratio (SNR), length of LDPC code, and order of OFDM is quantified by simulation. Results show that while the OFDM with subcarrier quadrature amplitude modulation (QAM-OFDM) has slightly better anti-turbulence performance than the OFDM with subcarrier phase shift keying modulation (PSK-OFDM), the LDPC-coded QAM-OFDM has a much better performance than the QAM-OFDM and the LDPC-coded PSK-OFDM, and, at SNR = 12, it decreases the BER by four orders of magnitude compared to the 16QAM-OFDM system when the scintillation coefficient σ ξ 2   = 0.05.

OPTICAL communications; WIRELESS communications; BIT error rate; PHASE shift keying; ORTHOGONAL frequency division multiplexing; QUADRATURE amplitude modulation

Photonics, 2023, Vol 10, Issue 3, p330

2304-6732

Academic Journal

10.3390/photonics10030330