Abstract
Owing to the large delay spread caused by multipath propagation and the severe Doppler Effect of the shallow water acoustic channel, a spread spectrum modulation scheme using hyperbolic frequency modulated (HFM) signal named as “HFM spread-spectrum modulation” (HFM-SS) was exploited to substantially improve the performance of communications over such channels. Apart from some advantages such as reducing influence of narrow-band noise, HFM signals provide Doppler-invariability and low power cost. The effects of multipath and Doppler shift on the proposed scheme were investigated by establishing a model of a shallow water acoustic communication system. The emulated results demonstrate that it has a good prospect for underwater acoustic communication system, especially for moving platforms. High transmission stability of this approach was validated in lake experiments carried out in the summer 2011.
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