Application of OFDM modulation for radiotelephone transmission identification in the maritime radiocommunication

OFDM modulation is proposed for application in data embedding algorithms in the maritime VHF radiotelephony. Experiments are carried out for signal transmission in the real VHF radio channel for off-line processing in MatLab. The rates of 4 bit/sec for simple algorithm and 40 bit/sec for algorithm considering information about audio carrier signal in the transmitter are obtained in the standard 300÷3000 Hz band. The design method is intended for implementation of radiotelephone transmissions automatic identification in maritime communication without standard radio equipment replacing, additional frequency-time resources allocation and altering the adopted radio communication procedures.