Underwater Acoustic Communication Base on M-ary Hyperbolic Frequency Modulated-Binary Orthogonal Keying using a Passive Time Reversal Mirror Approach

In this paper we study the HFM BOK (M-ary Hyperbolic Frequency Modulated-Binary Orthogonal Keying) modulation technology which is suitable for underwater acoustic communication. Under the guidance of the theory, we test the practicability of the system through MATLAB simulation. This system uses MFSK-MBOK cascaded technology and decreases the systematic calculated amount largely, in addition, the scheme has characteristic of constant envelope. Finally, an underwater acoustic communication system has been tested by sea experiments. The experimental results show that the system is able to achieve a robust and reliable communication under the conditions of low signal-to-noise ratio and strong multipath using passive time reversal mirror technology. Copyright © 2014 IFSA Publishing, S. L.