Performance of underwater data transmission using incoherent modulation MFSK in very shallow waters
Abstract
Ensuring universal and stable underwater communication in shallow waters for various environmental conditions is a difficult scientific and engineering task. In particular, this applies to underwater communication systems that use acoustic waves in very shallow underwater channels, where multipath propagation permanently occurs. The article provides assumptions for a system working with incoherent M-ary Frequency Shift Keying (MFSK) modulation along with guidelines for eliminating the impact of the multipath phenomenon. The results of experimental tests carried out in the lake for two seasons and, therefore, different sound speed profiles are presented. For comparison purposes, three transducers placed at different depths, including at the bottom of the reservoir, were used to receive the transmitted signals.
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