Experimental Research On Low Density Parity Check Code (Ldpc) For Maritime Navigation Digital Systems

The maritime navigation digital system proposed in this paper uses the Orthogonal Frequency Division Multiplexing (OFDM) modulation method instead of the original Frequency Shift Keying (FSK) modulation method to increase the capability of the maritime security department to broadcast information by 150 times. The key is to encode the matrix digital structure with a new Low Density Parity Check (LDPC) code. In this paper, digital information is encoded by introducing an LDPC code encoding matrix digital structure. A test platform was set up in the Yangtze River estuary in China, and it was verified that the new LDPC encoding method has strong digital transmission capability, and its system information transmission capability can reach more than 150 times that of the traditional Narrow Band Direct Printed (NBDP) telegraph transmission.