The Bit Error Rate Performance Analysis Of Ldpc Code In Ultraviolet Communication System

We propose a scheme of ultraviolet (UV) communication system with low- density parity-check (LDPC) code. LU decomposition algorithm is adopted as the channel coding algorithm and log likelihood ratio sum-product algorithm (LLR-SPA) is adopted as the channel decoding method. In this paper, additive white gaussian noise (AWGN) model is used to simulate the influence of noise on the ultraviolet signal in the atmospheric channel and cut-complementary (CC) model is used to forecast the path loss of UV communication system. The bit error rate (BER) performance of UV communication system is studied by simulation from aspects of transmission power, photoelectric conversion efficiency, filter transmittance, transmitter and receiver elevation angle. The simulation results show that, in a non-line-of-sight (NLOS) case, the communication distance can achieve about 200m with 10(-3) BER when the transmission power is 260mW.