The strong interference in the visible channel and the insufficient error correction performance of the coding techniques for OCC(Optical Camera Communication) systems cause the reliability of OCC systems to be reduced. A QC-LDPC(Quasi-Cyclic Low Density Parity Check Code) compilation code algorithm for OCC system is proposed. According to the structural characteristics of OCC system and channel link characteristics, QC-LDPC code with structured design and low-complexity decoding characteristics is identified as the error correction code type, and fast coding algorithm is used to reduce the computational complexity of the coding process.Combined with the normalized least-sum algorithm and the layered decoding algorithm, an improved L-MS(Layer-Min Sum) decoding algorithm is proposed. The experimental results show that the BER(Bit Error Rate)of the OCC is 3. 16x10^-6. The communication rate is 2 850. 4 bit / s under the communication scenario of indoor environment. The BER of the OCC system is 9.07x10^-6 and the communication rate is 2 797. 9 bit / s under the communication scenario of outdoor environment. The proposed method effectively maintains a low bit error rate while ensuring a satisfactory data transmission rate.

optical camera communication, encoding and decoding, quasi-cyclic low density parity check code(LDPC)code, field-programmable gate array(FPGA), frame structure